I was using a chisel to remove, by scraping, foam tape from aluminum
frames. I was listening to the radio through headphones while doing
this. An FM station if that matters. Anyway, sometimes I could hear
the tape separating from the aluminum. I thought the tape must be
making a lot of sound if I could hear it through the headphones.
Removing them only made the process silent. Putting them back on I
could hear the hiss again. I think that there must be a charge being
released when the glue is scraped away from the substrate.
ERS

Yep, first noticed that phenomenon when removing tape the help film to
spool in a darkroom. Removing the tape generated light.

I have seen a glow phenomenon when opening self sealing envelopes which
may be related. If you open them in darkened conditions it is highlighted.

Eric R Snow wrote:

I was using a chisel to remove, by scraping, foam tape from aluminum
frames. I was listening to the radio through headphones while doing
this. An FM station if that matters. Anyway, sometimes I could hear
the tape separating from the aluminum. I thought the tape must be
making a lot of sound if I could hear it through the headphones.
Removing them only made the process silent. Putting them back on I
could hear the hiss again. I think that there must be a charge being
released when the glue is scraped away from the substrate.
ERS

On Sun, 03 Jul 2005 16:14:47 -0700, footy wrote:

Yep, first noticed that phenomenon when removing tape the help film to
spool in a darkroom. Removing the tape generated light.
I bet it's similar, or exactly, the same thing you get when you break
wint-o-green lifesavers. I think that sensitive light detectors are
being put underground to measure the light given off from clays in the
earth that are disturbed by movement, such as fault slippage.
ERS

Static electricity being generated.

Common problem handling X-Ray and other film before development.

Didn't know that you could hear it in the AM band though.

Hugh


"Eric R Snow" wrote in message
...
I was using a chisel to remove, by scraping, foam tape from aluminum
frames. I was listening to the radio through headphones while doing
this. An FM station if that matters. Anyway, sometimes I could hear
the tape separating from the aluminum. I thought the tape must be
making a lot of sound if I could hear it through the headphones.
Removing them only made the process silent. Putting them back on I
could hear the hiss again. I think that there must be a charge being
released when the glue is scraped away from the substrate.
ERS

Hugh Prescott wrote:
Static electricity being generated.

Common problem handling X-Ray and other film before development.

Didn't know that you could hear it in the AM band though.



Must be why that crackling noises I used to hear while listening to
"Sgt. Preston of the Yukon" and "I love a mystery" when all we had was
AM radio --- was called "static". G

Jeff

--
Jeffry Wisnia

(W1BSV + Brass Rat '57 EE)

"Truth exists; only falsehood has to be invented."

Ever wonder why it was called friction tape. Take a roll into the dark
and unroll some. Fascinating.
kk

"Eric R Snow" wrote in message
...
| I was using a chisel to remove, by scraping, foam tape from aluminum
| frames. I was listening to the radio through headphones while doing
| this. An FM station if that matters. Anyway, sometimes I could hear
| the tape separating from the aluminum. I thought the tape must be
| making a lot of sound if I could hear it through the headphones.
| Removing them only made the process silent. Putting them back on I
| could hear the hiss again. I think that there must be a charge being
| released when the glue is scraped away from the substrate.
| ERS

Very cool story! Methinks it's static, with high enough voltage and
current to create a magnetic field that your radio could pick up. I wonder
that if you tried it with any other radio whether it would still work. I
think not, given the exact circumstances required to make it happen.
There's some fancy terms for it, but they elude me at the moment.

On Mon, 04 Jul 2005 05:57:27 GMT, "carl mciver"
wrote:

"Eric R Snow" wrote in message
.. .
| I was using a chisel to remove, by scraping, foam tape from aluminum
| frames. I was listening to the radio through headphones while doing
| this. An FM station if that matters. Anyway, sometimes I could hear
| the tape separating from the aluminum. I thought the tape must be
| making a lot of sound if I could hear it through the headphones.
| Removing them only made the process silent. Putting them back on I
| could hear the hiss again. I think that there must be a charge being
| released when the glue is scraped away from the substrate.
| ERS

Very cool story! Methinks it's static, with high enough voltage and
current to create a magnetic field that your radio could pick up. I wonder
that if you tried it with any other radio whether it would still work. I
think not, given the exact circumstances required to make it happen.
There's some fancy terms for it, but they elude me at the moment.
Now I'm wondering if it was the wire to the headphones that was
picking up the sound. Then it wouldn't matter what frequency the radio
was tuned to.
ERS

"Eric R Snow" wrote in message
...
On Mon, 04 Jul 2005 05:57:27 GMT, "carl mciver"
wrote:

"Eric R Snow" wrote in message
.. .
| I was using a chisel to remove, by scraping, foam tape from aluminum
| frames. I was listening to the radio through headphones while doing
| this. An FM station if that matters. Anyway, sometimes I could hear
| the tape separating from the aluminum. I thought the tape must be
| making a lot of sound if I could hear it through the headphones.
| Removing them only made the process silent. Putting them back on I
| could hear the hiss again. I think that there must be a charge being
| released when the glue is scraped away from the substrate.
| ERS

Very cool story! Methinks it's static, with high enough voltage and
current to create a magnetic field that your radio could pick up. I
wonder
that if you tried it with any other radio whether it would still work. I
think not, given the exact circumstances required to make it happen.
There's some fancy terms for it, but they elude me at the moment.
Now I'm wondering if it was the wire to the headphones that was
picking up the sound. Then it wouldn't matter what frequency the radio
was tuned to.
ERS

Foam tends to create static electricity - the sparks get picked up by
an am radio (in general an FM radio will not pick it up for several
reasons). Take a piece of foam in the dark, let your eyes adjust then
rip it and watch the sparks. I used to see the same thing with the
tape on the end of 35mm film when I pulled it off in the darkroom
before loading the film in the tank for processing. Some foams are
really bad for static.

mikey

On Mon, 4 Jul 2005 12:34:25 -0700, "Mike Fields"
wrote:


"Eric R Snow" wrote in message
.. .
On Mon, 04 Jul 2005 05:57:27 GMT, "carl mciver"
wrote:

"Eric R Snow" wrote in message
.. .
| I was using a chisel to remove, by scraping, foam tape from aluminum
| frames. I was listening to the radio through headphones while doing
| this. An FM station if that matters. Anyway, sometimes I could hear
| the tape separating from the aluminum. I thought the tape must be
| making a lot of sound if I could hear it through the headphones.
| Removing them only made the process silent. Putting them back on I
| could hear the hiss again. I think that there must be a charge being
| released when the glue is scraped away from the substrate.
| ERS

Very cool story! Methinks it's static, with high enough voltage and
current to create a magnetic field that your radio could pick up. I
wonder
that if you tried it with any other radio whether it would still work. I
think not, given the exact circumstances required to make it happen.
There's some fancy terms for it, but they elude me at the moment.
Now I'm wondering if it was the wire to the headphones that was
picking up the sound. Then it wouldn't matter what frequency the radio
was tuned to.
ERS

Foam tends to create static electricity - the sparks get picked up by
an am radio (in general an FM radio will not pick it up for several
reasons). Take a piece of foam in the dark, let your eyes adjust then
rip it and watch the sparks. I used to see the same thing with the
tape on the end of 35mm film when I pulled it off in the darkroom
before loading the film in the tank for processing. Some foams are
really bad for static.

mikey

So since I was listening to FM what gives? Was it the earphones?
ERS

"Eric R Snow" wrote in message
...
On Mon, 4 Jul 2005 12:34:25 -0700, "Mike Fields"
wrote:


"Eric R Snow" wrote in message
.. .
On Mon, 04 Jul 2005 05:57:27 GMT, "carl mciver"
wrote:

"Eric R Snow" wrote in message
.. .
| I was using a chisel to remove, by scraping, foam tape from aluminum
| frames. I was listening to the radio through headphones while doing
| this. An FM station if that matters. Anyway, sometimes I could hear
| the tape separating from the aluminum. I thought the tape must be
| making a lot of sound if I could hear it through the headphones.
| Removing them only made the process silent. Putting them back on I
| could hear the hiss again. I think that there must be a charge being
| released when the glue is scraped away from the substrate.
| ERS

Very cool story! Methinks it's static, with high enough voltage
and
current to create a magnetic field that your radio could pick up. I
wonder
that if you tried it with any other radio whether it would still work.
I
think not, given the exact circumstances required to make it happen.
There's some fancy terms for it, but they elude me at the moment.
Now I'm wondering if it was the wire to the headphones that was
picking up the sound. Then it wouldn't matter what frequency the radio
was tuned to.
ERS

Foam tends to create static electricity - the sparks get picked up by
an am radio (in general an FM radio will not pick it up for several
reasons). Take a piece of foam in the dark, let your eyes adjust then
rip it and watch the sparks. I used to see the same thing with the
tape on the end of 35mm film when I pulled it off in the darkroom
before loading the film in the tank for processing. Some foams are
really bad for static.

mikey

So since I was listening to FM what gives? Was it the earphones?
ERS

Ooops - mis-read on my part - thought you said AM. FM is less sensitive
to the phenomena for a couple of reasons 1) much higher frequency and
2) "theoretically" FM only is sensitive to the Frequency Modulation of
the signal. On weak signals (or cheap receivers), they do tend to pick
up the static etc. The sharp pulse of the discharge has a very fast rise
and fall time -- this means it has lots of high frequency components in
the signal it sends. You were probably hearing the edge of the pulses.
Look at the old spark gap transmitters (first radio transmitters). Can
you say "splatter" - they ran an arc !! with a "tuned circuit" on the output
that fed an antenna. Many years ago (early days of personal computers),
back in the CP/M era, one of the favorite programs around allowed you
to play tunes on your radio simply by holding it close to the computer -
they wrote code to strobe the various address/data lines at the rate they
wanted and you picked up the RFI from the computer.

mikey

Eric R Snow wrote:

I was using a chisel to remove, by scraping, foam tape from aluminum
frames. I was listening to the radio through headphones while doing
this. An FM station if that matters. Anyway, sometimes I could hear
the tape separating from the aluminum. I thought the tape must be
making a lot of sound if I could hear it through the headphones.
Removing them only made the process silent. Putting them back on I
could hear the hiss again. I think that there must be a charge being
released when the glue is scraped away from the substrate.
ERS


Mylar "packing tape" is an electret.

It has a built in charge. Sufficient to actually work as a self
energized diaphragm for a condensor (electrostatic) loudspeaker -
although not a particularly good one.

dunno if it was a mylar tape.

_-_-bear

Eric R Snow wrote in
:

I was using a chisel to remove, by scraping, foam tape from aluminum
frames. I was listening to the radio through headphones while doing
this. An FM station if that matters. Anyway, sometimes I could hear
the tape separating from the aluminum. I thought the tape must be
making a lot of sound if I could hear it through the headphones.
Removing them only made the process silent. Putting them back on I
could hear the hiss again. I think that there must be a charge being
released when the glue is scraped away from the substrate.
ERS

Did it sound anything like the file at this link?
http://home.earthlink.net/~lenyr/alsounds.htm

If it did, the aluminum was actually broadcasting
(The adhesive would have been acting as the electrolyte, your chisel as
the dissimilar metal)
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misterpaslow wrote:
Eric R Snow wrote in
:


I was using a chisel to remove, by scraping, foam tape from aluminum
frames. I was listening to the radio through headphones while doing
this. An FM station if that matters. Anyway, sometimes I could hear
the tape separating from the aluminum. I thought the tape must be
making a lot of sound if I could hear it through the headphones.
Removing them only made the process silent. Putting them back on I
could hear the hiss again. I think that there must be a charge being
released when the glue is scraped away from the substrate.
ERS


Did it sound anything like the file at this link?
http://home.earthlink.net/~lenyr/alsounds.htm

If it did, the aluminum was actually broadcasting
(The adhesive would have been acting as the electrolyte, your chisel as
the dissimilar metal)
-----------------
www.Newsgroup-Binaries.com - *Completion*Retention*Speed*
Access your favorite newsgroups from home or on the road
-----------------
There is a form of electricity called triboelectricity. It is related
to friction, but can indeed be induced when seperating adhesive
surfaces. Usually it is more intense with tape on a non-conductor. Try
removing a good tape from a surface in a completely dark room. You may
well see sparks and a plasma-like glow.

In article , Don Stauffer says...

There is a form of electricity called triboelectricity. It is related
to friction, but can indeed be induced when seperating adhesive
surfaces. Usually it is more intense with tape on a non-conductor. Try
removing a good tape from a surface in a completely dark room. You may
well see sparks and a plasma-like glow.

Have you ever seen somebody chew wintergreen lifesavers in the
dark? (experiment best performed with a member of the opposite
sex btw)

Jim


--
==================================================
please reply to:
JRR(zero) at pkmfgvm4 (dot) vnet (dot) ibm (dot) com
==================================================

Don Stauffer wrote:

misterpaslow wrote:

Eric R Snow wrote in
:


I was using a chisel to remove, by scraping, foam tape from aluminum
frames. I was listening to the radio through headphones while doing
this. An FM station if that matters. Anyway, sometimes I could hear
the tape separating from the aluminum. I thought the tape must be
making a lot of sound if I could hear it through the headphones.
Removing them only made the process silent. Putting them back on I
could hear the hiss again. I think that there must be a charge being
released when the glue is scraped away from the substrate.
ERS



Did it sound anything like the file at this link?
http://home.earthlink.net/~lenyr/alsounds.htm

If it did, the aluminum was actually broadcasting
(The adhesive would have been acting as the electrolyte, your chisel
as the dissimilar metal)
-----------------
www.Newsgroup-Binaries.com - *Completion*Retention*Speed*
Access your favorite newsgroups from home or on the road
-----------------

There is a form of electricity called triboelectricity. It is related
to friction, but can indeed be induced when seperating adhesive
surfaces. Usually it is more intense with tape on a non-conductor. Try
removing a good tape from a surface in a completely dark room. You may
well see sparks and a plasma-like glow.
Yep - did a paper on the subject. Try good 'ole standard 3-M magic tape.
zaps nicely.

Martin

--
Martin Eastburn
@ home at Lion's Lair with our computer lionslair at consolidated dot net
NRA LOH, NRA Life
NRA Second Amendment Task Force Charter Founder

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