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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Convert a 45 RPM record to Metric
The old 45 RPM (revolutions per minute) vinyl records were called 45's
by everyone who had them. If we were using a metric system at that time, would they still be called 45 rpm, or would there be some metric numbers used instead? I was having this discussion with a few people and no one knew the answer..... (Personally, I think they would still be 45 rpm, but I could be wrong). |
#2
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Convert a 45 RPM record to Metric
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#3
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Convert a 45 RPM record to Metric
On Thu, 31 Aug 2017 10:59:08 -0700, Taxed and Spent
wrote: I stand by my answer: 4.5 drpm. Surely you have heard of Decca records! What does the "d" stand for? Is it "D"ecca? |
#4
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Convert a 45 RPM record to Metric
On Thu, 31 Aug 2017 12:00:46 -0400, oldschool wrote:
The old 45 RPM (revolutions per minute) vinyl records were called 45's by everyone who had them. If we were using a metric system at that time, would they still be called 45 rpm, or would there be some metric numbers used instead? No difference at all. -- This message may be freely reproduced without limit or charge only via the Usenet protocol. Reproduction in whole or part through other protocols, whether for profit or not, is conditional upon a charge of GBP10.00 per reproduction. Publication in this manner via non-Usenet protocols constitutes acceptance of this condition. |
#5
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Convert a 45 RPM record to Metric
Revolutions per minute remain revolutions per minute in the old or new currency. Minutes and revolutions are neither metric nor SAE, nor Whitworth for that matter. all of them would count turns per time period the same.
There are also 45 rpm records of several diameters, to further confuse the issue for you. But, each one revolves on the platter forty-five (45) turns per minute (60 seconds). Note that in common use, RCA-base records were called 78s. Even though Edison discs were, most typically, 84s. LPs (33.3) were sometimes called "33s" but mostly LPs. I suspect that those who were victims of your discussions were not so much uncertain of the answer as unable to formulate said answer in a way you could understand. Peter Wieck Melrose Park, PA |
#6
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Convert a 45 RPM record to Metric
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#7
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Convert a 45 RPM record to Metric
In article ,
Taxed and Spent wrote: I stand by my answer: 4.5 drpm. Surely you have heard of Decca records! Owww. May vile vinyl vengeance visit itself upon you. :-) |
#8
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Convert a 45 RPM record to Metric
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#9
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Convert a 45 RPM record to Metric
On 31/08/17 17:00, wrote:
The old 45 RPM (revolutions per minute) vinyl records were called 45's by everyone who had them. If we were using a metric system at that time, would they still be called 45 rpm, or would there be some metric numbers used instead? I was having this discussion with a few people and no one knew the answer..... (Personally, I think they would still be 45 rpm, but I could be wrong). 0.75 revs per second if you want to be completely non-SI about it? https://physics.nist.gov/cuu/Units/outside.html -- Adrian C |
#10
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Convert a 45 RPM record to Metric
On 31/08/17 19:38, Adrian Caspersz wrote:
0.75 revs per second if you want to be completely non-SI about it? https://physics.nist.gov/cuu/Units/outside.html er, non-non-SI ... -- Adrian C |
#11
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Convert a 45 RPM record to Metric
Adrian Caspersz wrote on 8/31/2017 2:38 PM:
On 31/08/17 17:00, wrote: The old 45 RPM (revolutions per minute) vinyl records were called 45's by everyone who had them. If we were using a metric system at that time, would they still be called 45 rpm, or would there be some metric numbers used instead? I was having this discussion with a few people and no one knew the answer..... (Personally, I think they would still be 45 rpm, but I could be wrong). 0.75 revs per second if you want to be completely non-SI about it? https://physics.nist.gov/cuu/Units/outside.html Depending on your usage of the info it might be 0.75*(2pi) or 4.712388980385 radians per second. -- Rick C Viewed the eclipse at Wintercrest Farms, on the centerline of totality since 1998 |
#12
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Convert a 45 RPM record to Metric
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#13
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Convert a 45 RPM record to Metric
In article ,
Taxed and Spent wrote: On 8/31/2017 9:00 AM, wrote: The old 45 RPM (revolutions per minute) vinyl records were called 45's by everyone who had them. If we were using a metric system at that time, would they still be called 45 rpm, or would there be some metric numbers used instead? I was having this discussion with a few people and no one knew the answer..... (Personally, I think they would still be 45 rpm, but I could be wrong). I think they would be 4.5 drpm. The French for a time tried decimal time where there were 10 hours in a day and 100 minutes in an hour. So in decimal minutes, or dm, it would be 64.8 rpdm or 6.48 drpdm. |
#14
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Convert a 45 RPM record to Metric
On 1/09/2017 4:59 AM, Robert Roland wrote:
On Thu, 31 Aug 2017 12:00:46 -0400, wrote: If we were using a metric system at that time, would they still be called 45 rpm, or would there be some metric numbers used instead? The metric part of the world also measures time in oddball units. **Huh? You mean 'seconds'? Oddball? BTW: The "metric part of the world" is 95% of the world. A pitifully insignificant 5% holds out against the inevitable. I think we are stuck with it. Switching to a new system would be essentially insurmountable. **RPM? In the SI unit system, however, the unit for angular velocity is radians per second. 45 RPM is a touch over 4.7 radians per second. **Rotating media is so last century. The number of users is utterly insignificant. I am, however, one of them. -- Trevor Wilson www.rageaudio.com.au |
#15
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Convert a 45 RPM record to Metric
On 08/31/2017 02:42 PM, rickman wrote:
The old 45 RPM (revolutions per minute) vinyl records were called 45's by everyone who had them. If we were using a metric system at that time, would they still be called 45 rpm, or would there be some metric numbers used instead? I was having this discussion with a few people and no one knew the answer..... (Personally, I think they would still be 45 rpm, but I could be wrong). 0.75 revs per second if you want to be completely non-SI about it? https://physics.nist.gov/cuu/Units/outside.html Depending on your usage of the info it might be 0.75*(2pi) or 4.712388980385 radians per second. Radians/sec. was the unit I assumed it would be, but I didn't bother with the calculation Perce |
#16
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#17
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Convert a 45 RPM record to Metric
In article ,
Percival P. Cassidy wrote: Depending on your usage of the info it might be 0.75*(2pi) or 4.712388980385 radians per second. Radians/sec. was the unit I assumed it would be, but I didn't bother with the calculation I prefer furlongs per fortnight (measured at the outer edge, of course). Since records can vary in diameter, this would require having at least one reliable reference standard for the industry to work from. Like the classic metric standards for length and weight, it should be of a stable, noncorroding metal, kept in an inert atmosphere in either Paris or Greenwich. Gives new meaning to the term "platinum record", doesn't it? |
#18
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Convert a 45 RPM record to Metric
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#19
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Convert a 45 RPM record to Metric
On Thursday, 31 August 2017 19:33:44 UTC+1, rickman wrote:
wrote on 8/31/2017 12:00 PM: The old 45 RPM (revolutions per minute) vinyl records were called 45's by everyone who had them. If we were using a metric system at that time, would they still be called 45 rpm, or would there be some metric numbers used instead? I was having this discussion with a few people and no one knew the answer..... (Personally, I think they would still be 45 rpm, but I could be wrong). 0.75 rps of course! I think I would call them 3/4 rips for short. Nearly, the second being the standard unit of time. They would be 0.75Hz. NT |
#20
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Convert a 45 RPM record to Metric
Dave Platt wrote on 8/31/2017 5:48 PM:
In article , Percival P. Cassidy wrote: Depending on your usage of the info it might be 0.75*(2pi) or 4.712388980385 radians per second. Radians/sec. was the unit I assumed it would be, but I didn't bother with the calculation I prefer furlongs per fortnight (measured at the outer edge, of course). Since records can vary in diameter, this would require having at least one reliable reference standard for the industry to work from. Like the classic metric standards for length and weight, it should be of a stable, noncorroding metal, kept in an inert atmosphere in either Paris or Greenwich. Gives new meaning to the term "platinum record", doesn't it? lol -- Rick C Viewed the eclipse at Wintercrest Farms, on the centerline of totality since 1998 |
#21
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Convert a 45 RPM record to Metric
Trevor Wilson wrote on 8/31/2017 4:28 PM:
On 1/09/2017 4:59 AM, Robert Roland wrote: On Thu, 31 Aug 2017 12:00:46 -0400, wrote: If we were using a metric system at that time, would they still be called 45 rpm, or would there be some metric numbers used instead? The metric part of the world also measures time in oddball units. **Huh? You mean 'seconds'? Oddball? BTW: The "metric part of the world" is 95% of the world. A pitifully insignificant 5% holds out against the inevitable. You talkin' 'bout US? I think we are stuck with it. Switching to a new system would be essentially insurmountable. **RPM? In the SI unit system, however, the unit for angular velocity is radians per second. 45 RPM is a touch over 4.7 radians per second. **Rotating media is so last century. The number of users is utterly insignificant. I am, however, one of them. -- Rick C Viewed the eclipse at Wintercrest Farms, on the centerline of totality since 1998 |
#22
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Convert a 45 RPM record to Metric
On 1/09/2017 11:29 AM, rickman wrote:
Trevor Wilson wrote on 8/31/2017 4:28 PM: On 1/09/2017 4:59 AM, Robert Roland wrote: On Thu, 31 Aug 2017 12:00:46 -0400, wrote: If we were using a metric system at that time, would they still be called 45 rpm, or would there be some metric numbers used instead? The metric part of the world also measures time in oddball units. **Huh? You mean 'seconds'? Oddball? BTW: The "metric part of the world" is 95% of the world. A pitifully insignificant 5% holds out against the inevitable. You talkin' 'bout US? **Yup. Just a few weeks back, I had to work on a US built product. Damned thing had two different types of Allen bolts in it (Whitworth and SAE). None of my usual Imperial Allen keys would fit it. I had to grind an old key down to fit. I NEVER have such issues with products using Metric Allen bolts. And, let's not get started with those insane fractional sizes, for screws, drills and all the other stuff. Metris stuff is so much easier. 1mm, 1.5mm, 2mm, 2.5mm, 3mm and so on. It just makes sense. I guess you can thank your brain-damaged Prez (at the time - Reagan) for that stupidity. Come to think of it, you have another brain-damaged Prez running the show again. What gives with you guys? You seem to vote for people with the intellect of a 10 year old every now and again. -- Trevor Wilson www.rageaudio.com.au |
#23
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Convert a 45 RPM record to Metric
Trevor Wilson wrote on 8/31/2017 11:07 PM:
On 1/09/2017 11:29 AM, rickman wrote: Trevor Wilson wrote on 8/31/2017 4:28 PM: On 1/09/2017 4:59 AM, Robert Roland wrote: On Thu, 31 Aug 2017 12:00:46 -0400, wrote: If we were using a metric system at that time, would they still be called 45 rpm, or would there be some metric numbers used instead? The metric part of the world also measures time in oddball units. **Huh? You mean 'seconds'? Oddball? BTW: The "metric part of the world" is 95% of the world. A pitifully insignificant 5% holds out against the inevitable. You talkin' 'bout US? **Yup. Just a few weeks back, I had to work on a US built product. Damned thing had two different types of Allen bolts in it (Whitworth and SAE). None of my usual Imperial Allen keys would fit it. I had to grind an old key down to fit. I NEVER have such issues with products using Metric Allen bolts. And, let's not get started with those insane fractional sizes, for screws, drills and all the other stuff. Metris stuff is so much easier. 1mm, 1.5mm, 2mm, 2.5mm, 3mm and so on. It just makes sense. What are you talking about Whitworth??? Nobody uses Whitworth in the US. That's a British thing. Actually it's a bit funny that you are bringing up the fractions. The sizes you mention are only convenient because of chance. Metric sizes are often very inconvenient. Feet and inches are very handy for most things we deal with because they were invented with convenience in mind. Metric is great when you are working with the numbers, but often the actual sizes are much less than convenient. Six foot skis are very convenient, but 180 cm are not so much. Another example, PCB traces are still measured in thousandths of an inch even when working with metric sized boards because the numbers are much more convenient, i.e. 6/6 vs. 0.1524 mm. Yeah, I'm for converting, but it's not about convenience of units, it's about being able to do calculations more easily. Hell, the metric stuff has mucked up measuring devices even when they aren't metric. I've never seen a tape measure with binary based fractions written in decimal numbers until now. That is the most useless thing yet! I guess you can thank your brain-damaged Prez (at the time - Reagan) for that stupidity. Come to think of it, you have another brain-damaged Prez running the show again. What gives with you guys? You seem to vote for people with the intellect of a 10 year old every now and again. Seems to me electing bad leaders is not unique to the US. Which country are you from? Never had any bad leaders, huh? -- Rick C Viewed the eclipse at Wintercrest Farms, on the centerline of totality since 1998 |
#24
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Convert a 45 RPM record to Metric
On 1/09/2017 5:50 PM, rickman wrote:
Trevor Wilson wrote on 8/31/2017 11:07 PM: On 1/09/2017 11:29 AM, rickman wrote: Trevor Wilson wrote on 8/31/2017 4:28 PM: On 1/09/2017 4:59 AM, Robert Roland wrote: On Thu, 31 Aug 2017 12:00:46 -0400, wrote: If we were using a metric system at that time, would they still be called 45 rpm, or would there be some metric numbers used instead? The metric part of the world also measures time in oddball units. **Huh? You mean 'seconds'? Oddball? BTW: The "metric part of the world" is 95% of the world. A pitifully insignificant 5% holds out against the inevitable. You talkin' 'bout US? **Yup. Just a few weeks back, I had to work on a US built product. Damned thing had two different types of Allen bolts in it (Whitworth and SAE). None of my usual Imperial Allen keys would fit it. I had to grind an old key down to fit. I NEVER have such issues with products using Metric Allen bolts. And, let's not get started with those insane fractional sizes, for screws, drills and all the other stuff. Metris stuff is so much easier. 1mm, 1.5mm, 2mm, 2.5mm, 3mm and so on. It just makes sense. What are you talking about Whitworth???Â* Nobody uses Whitworth in the US. That's a British thing. **Truthfully, I have no idea what the other Allen bolts were. My SAE Allen keys fitted one set, but none of the SAE ones I had (or the ones my neighbour had) fitted. Maybe it wasn't Whitworth, but it sure wasn't Metric or SAE. Actually it's a bit funny that you are bringing up the fractions.Â* The sizes you mention are only convenient because of chance.Â* Metric sizes are often very inconvenient. **Nope. Never. However, I'll bite: When do you think they're inconvenient? Â* Feet and inches are very handy for most things we deal with because they were invented with convenience in mind. **12 inches = 1 foot. 3 feet = 1 yard. 1,760 feet = 1 mile. In what universe is this convenient? Western numbering is base 10. Not base 12. It's ****ing insane. Â* Metric is great when you are working with the numbers, but often the actual sizes are much less than convenient.Â* Six foot skis are very convenient, but 180 cm are not so much. **Since my skis are 2 Metres, I find them quite convenient. Yeah, I know, I really should buy some of those modern skis. Â* Another example, PCB traces are still measured in thousandths of an inch even when working with metric sized boards because the numbers are much more convenient, i.e. 6/6 vs. 0.1524 mm. **On that we agree. The electronics industry is likely stuck with such arcane measurements for a very long time. Yeah, I'm for converting, but it's not about convenience of units, it's about being able to do calculations more easily. **Yep. Base 10. Not base 12, or whatever silly measurements the Imperial system deems appropriate. 16 ounces = 1 pound. Sheesh! How many pints in a gallon? How many in a US gallon? It goes on and on, with sillier units. Hell, the metric stuff has mucked up measuring devices even when they aren't metric.Â* I've never seen a tape measure with binary based fractions written in decimal numbers until now.Â* That is the most useless thing yet! **Huh? Most of my tape measures are printed in Metric and Imperial. The Metric side is easier to use and read. FWIW: I grew up with Imperial. Switching to Metric was painless and delightful. I guess you can thank your brain-damaged Prez (at the time - Reagan) for that stupidity. Come to think of it, you have another brain-damaged Prez running the show again. What gives with you guys? You seem to vote for people with the intellect of a 10 year old every now and again. Seems to me electing bad leaders is not unique to the US.Â* Which country are you from?Â* Never had any bad leaders, huh? **Australia and, yes. We've had a few, but none quite as appalling as Trump. -- Trevor Wilson www.rageaudio.com.au |
#25
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Convert a 45 RPM record to Metric
On Thu, 31 Aug 2017 12:00:46 -0400, wrote:
The old 45 RPM (revolutions per minute) vinyl records were called 45's by everyone who had them. If we were using a metric system at that time, would they still be called 45 rpm, or would there be some metric numbers used instead? I was having this discussion with a few people and no one knew the answer..... (Personally, I think they would still be 45 rpm, but I could be wrong). 282.743339999999 radians per minute. Regards, Boris Mohar Got Knock? - see: Viatrack Printed Circuit Designs (among other things) http://www.viatrack.ca void _-void-_ in the obvious place --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus |
#26
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Convert a 45 RPM record to Metric
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#27
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Convert a 45 RPM record to Metric
Trevor Wilson wrote on 9/1/2017 6:26 AM:
On 1/09/2017 5:50 PM, rickman wrote: Trevor Wilson wrote on 8/31/2017 11:07 PM: I guess you can thank your brain-damaged Prez (at the time - Reagan) for that stupidity. Come to think of it, you have another brain-damaged Prez running the show again. What gives with you guys? You seem to vote for people with the intellect of a 10 year old every now and again. Seems to me electing bad leaders is not unique to the US. Which country are you from? Never had any bad leaders, huh? **Australia and, yes. We've had a few, but none quite as appalling as Trump. I know little about your leaders, but you have some great entertainment. Jim Jefferies is a hoot, but I like his specials better than his show. I watch several TV shows from down under, Ms Fletcher, Rake, Dr. Blake, and I'm just startng Bess... -- Rick C Viewed the eclipse at Wintercrest Farms, on the centerline of totality since 1998 |
#28
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Convert a 45 RPM record to Metric
On some great and glorious day the plain folks of the land will reach their heart's desire at last, and the White House will be adorned by a downright moron.
In this world of sin and sorrow there is always something to be thankful for; as for me, I rejoice that I am not a Republican. H.L. Mencken We are all born ignorant. However, one has to work hard to remain stupid. Ben Franklin No, you are NOT entitled to your opinion. You are entitled to your informed opinion. Harlan Ellison. None of the above are mine. Peter Wieck Melrose Park, PA |
#29
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Convert a 45 RPM record to Metric
On Fri, 1 Sep 2017 06:28:09 +1000, Trevor Wilson
wrote: The metric part of the world also measures time in oddball units. **Huh? You mean 'seconds'? Oddball? Yes, the second is totally weird. Its original definition is one 86,400th of a day. Who in their right mind would divide something into 86,400 parts? There are two basic units of time; the day and the year. Those are astronomically defined. We pick one of those as the base unit. This can be split into thousandths or millionths or whatever is practical for the application. What we today know as a second is simply 11.6 microdays, or 31.7 nanoyears. I sleep about 300 millidays each night. As you suggest, the second is so ingrained in everything that there is no realistic way to get rid of it. But at least, let's abolish the minute and the hour. Introduce a new unit that is 100 seconds. Let's call it a "dol". There are 864 dols in one day. I go to work around 250 dols, but today I was almost 20 dols late. I think we are stuck with it. Switching to a new system would be essentially insurmountable. **RPM? The 24 and 60 fractions. Don't get me started on the way we divide the year. -- RoRo |
#30
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Convert a 45 RPM record to Metric
On Fri, 1 Sep 2017 03:50:38 -0400, rickman wrote:
Six foot skis are very convenient, but 180 cm are not so much. Why do you think that is? Because that's what you are USED TO, of course. If you told me you skis are "six foot" long, I would have no clue if they were too long or too short for me. If you told me they are "one eighty", I'd know right away. If you told me they are 1800 mm long, I'd still know right away. If I told you they are 72 inches, you'd have to think about it for a second. It is more convenient to move a decimal separator than to divide by 12. Another example, PCB traces are still measured in thousandths of an inch even when working with metric sized boards because the numbers are much more convenient, i.e. 6/6 vs. 0.1524 mm. You've got it all backwards. I would make that trace 0.15 mm, which is much more convenient than 5.90551181 thousandths of an inch. Obviously, the inch is more convenient when you choose an example that is a nice, round fraction of an inch. Your example uses a unit that is ONE THOUSANDTH of an inch. You can't do that. The thousand (and the hundred and the ten) belongs to the metric system. The imperial system uses halves, quarters, eighths and so on. Your trace is roughly 3/512 of an inch if you were to stick to your system. -- RoRo |
#31
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Convert a 45 RPM record to Metric
Robert Roland wrote on 9/1/2017 2:51 PM:
On Fri, 1 Sep 2017 03:50:38 -0400, rickman wrote: Six foot skis are very convenient, but 180 cm are not so much. Why do you think that is? Because that's what you are USED TO, of course. If you told me you skis are "six foot" long, I would have no clue if they were too long or too short for me. If you told me they are "one eighty", I'd know right away. I'm not talking about the familiarity of the units, I'm talking about the convenience. Just like the Brits still use stones for weight because they don't need the precision of knowing they are 224 pounds, but 16 stone is very handy. If you told me they are 1800 mm long, I'd still know right away. If I told you they are 72 inches, you'd have to think about it for a second. It is more convenient to move a decimal separator than to divide by 12. Now you are getting close. I buy stuff on ebay and it is not uncommon to see dimensions of 4 digits in mm when it would be more convenient in dm or even just meters, but easily more convenient in feet or inches. mm are far more precise than needed for most measurements and awkward to scribe on rulers since the lines need to be so thin they are hard to see. I expect tape measures are graduated in 2 mm divisions. If they aren't, they should be. Another example, PCB traces are still measured in thousandths of an inch even when working with metric sized boards because the numbers are much more convenient, i.e. 6/6 vs. 0.1524 mm. You've got it all backwards. I would make that trace 0.15 mm, which is much more convenient than 5.90551181 thousandths of an inch. Obviously, the inch is more convenient when you choose an example that is a nice, round fraction of an inch. I would love for all PCB measurements to be metric since the parts on the board are all metric. But I don't write the software and I don't design the web interfaces that 90% use mils and not metric. Now that trace/space measurements are getting to be fractions of mils, we may see that change, but small unit numbers are always more convenient than fractions or large numbers. That's why we have wire gauge, etc. Your example uses a unit that is ONE THOUSANDTH of an inch. You can't do that. The thousand (and the hundred and the ten) belongs to the metric system. The imperial system uses halves, quarters, eighths and so on. Your trace is roughly 3/512 of an inch if you were to stick to your system. Ok, I'll inform the world. World! Consider yourself on notice!!! No more use of mils or micro-inches! -- Rick C Viewed the eclipse at Wintercrest Farms, on the centerline of totality since 1998 |
#32
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Convert a 45 RPM record to Metric
Robert Roland wrote on 9/1/2017 2:08 PM:
On Fri, 1 Sep 2017 06:28:09 +1000, Trevor Wilson wrote: The metric part of the world also measures time in oddball units. **Huh? You mean 'seconds'? Oddball? Yes, the second is totally weird. Its original definition is one 86,400th of a day. Who in their right mind would divide something into 86,400 parts? There are two basic units of time; the day and the year. Those are astronomically defined. We pick one of those as the base unit. This can be split into thousandths or millionths or whatever is practical for the application. What we today know as a second is simply 11.6 microdays, or 31.7 nanoyears. I sleep about 300 millidays each night. As you suggest, the second is so ingrained in everything that there is no realistic way to get rid of it. But at least, let's abolish the minute and the hour. Introduce a new unit that is 100 seconds. Let's call it a "dol". There are 864 dols in one day. I go to work around 250 dols, but today I was almost 20 dols late. To what advantage exactly??? I think we are stuck with it. Switching to a new system would be essentially insurmountable. **RPM? The 24 and 60 fractions. Don't get me started on the way we divide the year. Don't worry, we won't. -- Rick C Viewed the eclipse at Wintercrest Farms, on the centerline of totality since 1998 |
#33
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Convert a 45 RPM record to Metric
Guys and gals, Europe lost a Mars mission due to a lack of corresponding units. It happens.
Personally, I spend some years in a metric country and learned in short order how to shift my thought process, as well as to read (modern) Arabic numbers. And, "thinking about it", should it avoid a Mars-type screw-up is, perhaps, not a bad thing. Any unit may be sufficiently divided to achieve necessary precision. I also spent a number of years working as a machinist for a company that made the liquid sodium pump seals for French breeder reactors. And the same machinist would make SAE parts on the same machine as he would make Metric parts - using the same measuring sticks, keeping all the while in his head how they divided and compared. That is what those guys did, and did it exceedingly well. Me, I was mostly QC - and signing off (literally acid-etching my name on a part or assembly) on their work. Yes, we did think of dimensions and measurements. Every day. And we lost no sleep whatsoever on which was 'better'. As long as the parts fit. Peter Wieck Melrose Park, PA |
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Convert a 45 RPM record to Metric
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Convert a 45 RPM record to Metric
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Convert a 45 RPM record to Metric
Mike Coon wrote:
says... Europe lost a Mars mission due to a lack of corresponding units. It happens. I thought that was a USA mission. Which mission was it? https://www.wired.com/2010/11/1110mars-climate-observer-report/ |
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Convert a 45 RPM record to Metric
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Convert a 45 RPM record to Metric
Mike Coon wrote on 9/1/2017 6:17 PM:
In article , says... There are two basic units of time; the day and the year. Those are astronomically defined. ... Except IIRC the "day" is ambiguous astronomically is you don't distinguish solar day (in usual parlance, e.g. between the sun being due south) and stellar with the stars returning to their same positions overhead. These two have to have a difference that adds up to a whole day over the course of the year. Is that a solar year or a sidereal year? -- Rick C Viewed the eclipse at Wintercrest Farms, on the centerline of totality since 1998 |
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Convert a 45 RPM record to Metric
On 31/08/17 20:55, Mark Storkamp wrote:
In article , Taxed and Spent wrote: I think they would be 4.5 drpm. The French for a time tried decimal time where there were 10 hours in a day and 100 minutes in an hour. So in decimal minutes, or dm, it would be 64.8 rpdm or 6.48 drpdm. https://en.wikipedia.org/wiki/Swatch_Internet_Time -- Adrian C |
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