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On Monday, March 19, 2018 at 1:48:49 PM UTC, The Natural Philosopher wrote:
On 19/03/18 11:11, Max Demian wrote:
On 19/03/2018 10:26, Brian Gaff wrote:
Well the earth is curved after all, so in reality nothing is flat or
level
is it?


I wonder how big a thing (building? bridge?) has to be before designers
have to take into account the curvature of the earth?

The tracks supprting the radio telecopes at Madingley - at two miles
long - were 'up' by IIRC 4 " at each end..

So not very big..





--
Climate Change: Socialism wearing a lab coat.


and I seem to remember that the distance between the two towers of the Humber bridge is greater at the top than at the bottom, by about 1" I think.
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On Wed, 21 Mar 2018 14:56:14 -0700, Murmansk wrote:

I've got one of these which works really well and is reasonably priced -
suspect you can get it for less than £60

It projects a massive cross onto the wall and finds its own level once
you've positioned it nearly right

https://www.clasohlson.com/uk/Bosch-...ss-Line-Laser-

Level/41-1001?
gclid=CjwKCAjwhcjVBRBHEiwAoDe5x0BfsBp8tJK0biMpZe9D hMq3CPxXw_sz1O9y-
m_Ot0wIVUrxNjxIbxoCv88QAvD_BwE

Thanks.

Mr. Stingy is already feeling a twinge about paying for a tripod when he
already has two perfectly good ones........

Looks interesting, though.


Cheers


Dave R

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On 21/03/2018 23:10, Jim K wrote:
Max Demian Wrote in message:
On 21/03/2018 20:22, Jim K wrote:
Johnny B Good Wrote in message:


It was not I who was obsessed with bridges needing to be "flat", it was
you. I think you are conflating Brian's mention about 'flatness' and
curvature of the Earth corrections with my not being able to find a
curvature of the earth divergence figure for the Severn bridge to compare
against the figure that Tim+ had found for the Humber bridge. I made no
mention of 'flatness' until you introduced it into this sub-thread.

--
Johnny B Good


Oh dear. Put very simply, if one wasn't trying to build
something flat, why would one be bothered with calculations to
the mm to allow for curvature of the earth ? !


To ensure that it's curved to the right degree?


Such as a.........?
(not a bridge shurely, if anything they are more likely to be hump
backed...)


A long, perfectly flat bridge deck would effectively dip in the middle
from a gravity POV. You would probably want it to follow the curvature
of the Earth.

--
Max Demian
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Max Demian Wrote in message:
On 21/03/2018 23:10, Jim K wrote:
Max Demian Wrote in message:
On 21/03/2018 20:22, Jim K wrote:
Johnny B Good Wrote in message:

It was not I who was obsessed with bridges needing to be "flat", it was
you. I think you are conflating Brian's mention about 'flatness' and
curvature of the Earth corrections with my not being able to find a
curvature of the earth divergence figure for the Severn bridge to compare
against the figure that Tim+ had found for the Humber bridge. I made no
mention of 'flatness' until you introduced it into this sub-thread.

--
Johnny B Good


Oh dear. Put very simply, if one wasn't trying to build
something flat, why would one be bothered with calculations to
the mm to allow for curvature of the earth ? !

To ensure that it's curved to the right degree?


Such as a.........?
(not a bridge shurely, if anything they are more likely to be hump
backed...)


A long, perfectly flat bridge deck would effectively dip in the middle
from a gravity POV. You would probably want it to follow the curvature
of the Earth.

--
Max Demian


If it was "perfectly flat" shurely it wouldn't dip anywhere?

--
Jim K


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In article ,
Max Demian wrote:
On 21/03/2018 23:10, Jim K wrote:
Max Demian Wrote in message:
On 21/03/2018 20:22, Jim K wrote:
Johnny B Good Wrote in message:

It was not I who was obsessed with bridges needing to be "flat",
it was you. I think you are conflating Brian's mention about
'flatness' and curvature of the Earth corrections with my not being
able to find a curvature of the earth divergence figure for the
Severn bridge to compare against the figure that Tim+ had found for
the Humber bridge. I made no mention of 'flatness' until you
introduced it into this sub-thread.

--
Johnny B Good


Oh dear. Put very simply, if one wasn't trying to build
something flat, why would one be bothered with calculations to
the mm to allow for curvature of the earth ? !

To ensure that it's curved to the right degree?


Such as a.........?
(not a bridge shurely, if anything they are more likely to be hump
backed...)


A long, perfectly flat bridge deck would effectively dip in the middle
from a gravity POV. You would probably want it to follow the curvature
of the Earth.


Indeed, if you drive over one of these long bridges you are going "up hill"
to the centre and then down again on the other side.

--
from KT24 in Surrey, England


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charles Wrote in message:
In article ,
Max Demian wrote:
On 21/03/2018 23:10, Jim K wrote:
Max Demian Wrote in message:
On 21/03/2018 20:22, Jim K wrote:
Johnny B Good Wrote in message:

It was not I who was obsessed with bridges needing to be "flat",
it was you. I think you are conflating Brian's mention about
'flatness' and curvature of the Earth corrections with my not being
able to find a curvature of the earth divergence figure for the
Severn bridge to compare against the figure that Tim+ had found for
the Humber bridge. I made no mention of 'flatness' until you
introduced it into this sub-thread.

--
Johnny B Good


Oh dear. Put very simply, if one wasn't trying to build
something flat, why would one be bothered with calculations to
the mm to allow for curvature of the earth ? !

To ensure that it's curved to the right degree?


Such as a.........?
(not a bridge shurely, if anything they are more likely to be hump
backed...)


A long, perfectly flat bridge deck would effectively dip in the middle
from a gravity POV. You would probably want it to follow the curvature
of the Earth.


Indeed, if you drive over one of these long bridges you are going "up hill"
to the centre and then down again on the other side.

--
from KT24 in Surrey, England


You can sometimes see ships going underneath too...

--
Jim K


----Android NewsGroup Reader----
http://usenet.sinaapp.com/
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On Thu, 22 Mar 2018 11:24:29 +0000, Jim K wrote:

Max Demian Wrote in message:
On 21/03/2018 23:10, Jim K wrote:
Max Demian Wrote in message:
On 21/03/2018 20:22, Jim K wrote:
Johnny B Good Wrote in message:

It was not I who was obsessed with bridges needing to be "flat",
it was
you. I think you are conflating Brian's mention about 'flatness'
and curvature of the Earth corrections with my not being able to
find a curvature of the earth divergence figure for the Severn
bridge to compare against the figure that Tim+ had found for the
Humber bridge. I made no mention of 'flatness' until you introduced
it into this sub-thread.

--
Johnny B Good


Oh dear. Put very simply, if one wasn't trying to build
something flat, why would one be bothered with calculations to
the mm to allow for curvature of the earth ? !

To ensure that it's curved to the right degree?


Such as a.........?
(not a bridge shurely, if anything they are more likely to be hump
backed...)


A long, perfectly flat bridge deck would effectively dip in the middle
from a gravity POV. You would probably want it to follow the curvature
of the Earth.

--
Max Demian


If it was "perfectly flat" shurely it wouldn't dip anywhere?


I assume Max meant "optically flat" but you're right, gravimetrically
speaking, the deck of the bridge would have a 'dip'. My main impression
from photos of such suspension bridges is that the road deck arches up
and over the crossing. I suspect this shape is chosen for structural
stability rather than to allow stalled vehicles to be manually pushed
clear of the bridge (and to prevent a whole bunch of stalled heavy goods
wagons from gravitating towards the middle of the span due to failed
parking brakes). :-)

--
Johnny B Good
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On Thu, 22 Mar 2018 00:45:04 -0700, Rednadnerb wrote:

On Monday, March 19, 2018 at 1:48:49 PM UTC, The Natural Philosopher
wrote:
On 19/03/18 11:11, Max Demian wrote:
On 19/03/2018 10:26, Brian Gaff wrote:
Well the earth is curved after all, so in reality nothing is flat or
level is it?

I wonder how big a thing (building? bridge?) has to be before
designers have to take into account the curvature of the earth?

The tracks supprting the radio telecopes at Madingley - at two miles
long - were 'up' by IIRC 4 " at each end..

So not very big..





--
Climate Change: Socialism wearing a lab coat.


and I seem to remember that the distance between the two towers of the
Humber bridge is greater at the top than at the bottom, by about 1" I
think.


According to Tim+, almost 50% more than that (36mm in fact).

--
Johnny B Good
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In article , Jim K
wrote:
charles Wrote in message:
In article , Max
Demian wrote:
On 21/03/2018 23:10, Jim K wrote:
Max Demian Wrote in message:
On 21/03/2018 20:22, Jim K wrote:
Johnny B Good Wrote in
message:

It was not I who was obsessed with bridges needing to be
"flat", it was you. I think you are conflating Brian's mention
about 'flatness' and curvature of the Earth corrections with my
not being able to find a curvature of the earth divergence figure
for the Severn bridge to compare against the figure that Tim+ had
found for the Humber bridge. I made no mention of 'flatness'
until you introduced it into this sub-thread.

-- Johnny B Good


Oh dear. Put very simply, if one wasn't trying to build
something flat, why would one be bothered with calculations to
the mm to allow for curvature of the earth ? !

To ensure that it's curved to the right degree?


Such as a.........? (not a bridge shurely, if anything they are more
likely to be hump backed...)


A long, perfectly flat bridge deck would effectively dip in the middle
from a gravity POV. You would probably want it to follow the
curvature of the Earth.


Indeed, if you drive over one of these long bridges you are going "up
hill" to the centre and then down again on the other side.

-- from KT24 in Surrey, England


You can sometimes see ships going underneath too...


I try not to look sideways

--
from KT24 in Surrey, England
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On Thu, 22 Mar 2018 11:24:29 +0000 (GMT+00:00), Jim K wrote:

Max Demian Wrote in message:
On 21/03/2018 23:10, Jim K wrote:
Max Demian Wrote in message:
On 21/03/2018 20:22, Jim K wrote:
Johnny B Good Wrote in message:

It was not I who was obsessed with bridges needing to be "flat", it was
you. I think you are conflating Brian's mention about 'flatness' and
curvature of the Earth corrections with my not being able to find a
curvature of the earth divergence figure for the Severn bridge to compare
against the figure that Tim+ had found for the Humber bridge. I made no
mention of 'flatness' until you introduced it into this sub-thread.

--
Johnny B Good


Oh dear. Put very simply, if one wasn't trying to build
something flat, why would one be bothered with calculations to
the mm to allow for curvature of the earth ? !

To ensure that it's curved to the right degree?


Such as a.........?
(not a bridge shurely, if anything they are more likely to be hump
backed...)


A long, perfectly flat bridge deck would effectively dip in the middle
from a gravity POV. You would probably want it to follow the curvature
of the Earth.

--
Max Demian


If it was "perfectly flat" shurely it wouldn't dip anywhere?


Flat is not horizontal, 'level' is. A roof can be at 45 deg. and flat (as is
a wall). A large 'flat' roof (as commonly used) would have a pool of water
in the middle after rain, as the edges are up with reference to gravity
(assuming that the roof is level re. gravity).
--
Peter.
The gods will stay away
whilst religions hold sway


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PeterC Wrote in message:
On Thu, 22 Mar 2018 11:24:29 +0000 (GMT+00:00), Jim K wrote:

Max Demian Wrote in message:
On 21/03/2018 23:10, Jim K wrote:
Max Demian Wrote in message:
On 21/03/2018 20:22, Jim K wrote:
Johnny B Good Wrote in message:

It was not I who was obsessed with bridges needing to be "flat", it was
you. I think you are conflating Brian's mention about 'flatness' and
curvature of the Earth corrections with my not being able to find a
curvature of the earth divergence figure for the Severn bridge to compare
against the figure that Tim+ had found for the Humber bridge. I made no
mention of 'flatness' until you introduced it into this sub-thread.

--
Johnny B Good


Oh dear. Put very simply, if one wasn't trying to build
something flat, why would one be bothered with calculations to
the mm to allow for curvature of the earth ? !

To ensure that it's curved to the right degree?

Such as a.........?
(not a bridge shurely, if anything they are more likely to be hump
backed...)

A long, perfectly flat bridge deck would effectively dip in the middle
from a gravity POV. You would probably want it to follow the curvature
of the Earth.

--
Max Demian


If it was "perfectly flat" shurely it wouldn't dip anywhere?


Flat is not horizontal, 'level' is. A roof can be at 45 deg. and flat (as is
a wall). A large 'flat' roof (as commonly used) would have a pool of water
in the middle after rain, as the edges are up with reference to gravity
(assuming that the roof is level re. gravity).
--
Peter.
The gods will stay away
whilst religions hold sway


Your roof will fail ;-)

So you're now saying something described as "perfectly flat" like
a bridge deck, can have dips in it? Like a snooker table...?
Mmm...

--
Jim K


----Android NewsGroup Reader----
http://usenet.sinaapp.com/
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On 22/03/18 18:00, Jim K wrote:
PeterC Wrote in message:
On Thu, 22 Mar 2018 11:24:29 +0000 (GMT+00:00), Jim K wrote:

Max Demian Wrote in message:
On 21/03/2018 23:10, Jim K wrote:
Max Demian Wrote in message:
On 21/03/2018 20:22, Jim K wrote:
Johnny B Good Wrote in message:

It was not I who was obsessed with bridges needing to be "flat", it was
you. I think you are conflating Brian's mention about 'flatness' and
curvature of the Earth corrections with my not being able to find a
curvature of the earth divergence figure for the Severn bridge to compare
against the figure that Tim+ had found for the Humber bridge. I made no
mention of 'flatness' until you introduced it into this sub-thread.

--
Johnny B Good


Oh dear. Put very simply, if one wasn't trying to build
something flat, why would one be bothered with calculations to
the mm to allow for curvature of the earth ? !

To ensure that it's curved to the right degree?

Such as a.........?
(not a bridge shurely, if anything they are more likely to be hump
backed...)

A long, perfectly flat bridge deck would effectively dip in the middle
from a gravity POV. You would probably want it to follow the curvature
of the Earth.

--
Max Demian


If it was "perfectly flat" shurely it wouldn't dip anywhere?


Flat is not horizontal, 'level' is. A roof can be at 45 deg. and flat (as is
a wall). A large 'flat' roof (as commonly used) would have a pool of water
in the middle after rain, as the edges are up with reference to gravity
(assuming that the roof is level re. gravity).
--
Peter.
The gods will stay away
whilst religions hold sway


Your roof will fail ;-)

So you're now saying something described as "perfectly flat" like
a bridge deck, can have dips in it? Like a snooker table...?
Mmm...

No. He is saying that a pool of water on Earth, is convex, like the
atlantic ocean...


--
Microsoft : the best reason to go to Linux that ever existed.
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On Thu, 22 Mar 2018 18:00:50 +0000 (GMT+00:00), Jim K wrote:

PeterC Wrote in message:
On Thu, 22 Mar 2018 11:24:29 +0000 (GMT+00:00), Jim K wrote:

Max Demian Wrote in message:
On 21/03/2018 23:10, Jim K wrote:
Max Demian Wrote in message:
On 21/03/2018 20:22, Jim K wrote:
Johnny B Good Wrote in message:

It was not I who was obsessed with bridges needing to be "flat", it was
you. I think you are conflating Brian's mention about 'flatness' and
curvature of the Earth corrections with my not being able to find a
curvature of the earth divergence figure for the Severn bridge to compare
against the figure that Tim+ had found for the Humber bridge. I made no
mention of 'flatness' until you introduced it into this sub-thread.

--
Johnny B Good


Oh dear. Put very simply, if one wasn't trying to build
something flat, why would one be bothered with calculations to
the mm to allow for curvature of the earth ? !

To ensure that it's curved to the right degree?

Such as a.........?
(not a bridge shurely, if anything they are more likely to be hump
backed...)

A long, perfectly flat bridge deck would effectively dip in the middle
from a gravity POV. You would probably want it to follow the curvature
of the Earth.

--
Max Demian


If it was "perfectly flat" shurely it wouldn't dip anywhere?


Flat is not horizontal, 'level' is. A roof can be at 45 deg. and flat (as is
a wall). A large 'flat' roof (as commonly used) would have a pool of water
in the middle after rain, as the edges are up with reference to gravity
(assuming that the roof is level re. gravity).
--
Peter.
The gods will stay away
whilst religions hold sway


Your roof will fail ;-)

So you're now saying something described as "perfectly flat" like
a bridge deck, can have dips in it? Like a snooker table...?
Mmm...


Something such as a snooker table needs to be level, not flat, i.e. all
parts are normal to gravity.
A flat surface, if the centre is normal (level) to gravity, will have the
edges (well, away from the centre) as 'up' re. gravity.
--
Peter.
The gods will stay away
whilst religions hold sway
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On 23/03/2018 08:54, PeterC wrote:
On Thu, 22 Mar 2018 18:00:50 +0000 (GMT+00:00), Jim K wrote:

PeterC Wrote in message:
On Thu, 22 Mar 2018 11:24:29 +0000 (GMT+00:00), Jim K wrote:

Max Demian Wrote in message:
On 21/03/2018 23:10, Jim K wrote:
Max Demian Wrote in message:
On 21/03/2018 20:22, Jim K wrote:
Johnny B Good Wrote in message:

It was not I who was obsessed with bridges needing to be "flat", it was
you. I think you are conflating Brian's mention about 'flatness' and
curvature of the Earth corrections with my not being able to find a
curvature of the earth divergence figure for the Severn bridge to compare
against the figure that Tim+ had found for the Humber bridge. I made no
mention of 'flatness' until you introduced it into this sub-thread.

--
Johnny B Good


Oh dear. Put very simply, if one wasn't trying to build
something flat, why would one be bothered with calculations to
the mm to allow for curvature of the earth ? !

To ensure that it's curved to the right degree?

Such as a.........?
(not a bridge shurely, if anything they are more likely to be hump
backed...)

A long, perfectly flat bridge deck would effectively dip in the middle
from a gravity POV. You would probably want it to follow the curvature
of the Earth.

--
Max Demian


If it was "perfectly flat" shurely it wouldn't dip anywhere?

Flat is not horizontal, 'level' is. A roof can be at 45 deg. and flat (as is
a wall). A large 'flat' roof (as commonly used) would have a pool of water
in the middle after rain, as the edges are up with reference to gravity
(assuming that the roof is level re. gravity).
--
Peter.
The gods will stay away
whilst religions hold sway


Your roof will fail ;-)

So you're now saying something described as "perfectly flat" like
a bridge deck, can have dips in it? Like a snooker table...?
Mmm...


Something such as a snooker table needs to be level, not flat, i.e. all
parts are normal to gravity.


Might be important if you have a /very/ large snooker table.
Traditionally they are made from a single piece of slate, the cleavage
layers being normal to the force of compression that formed it, so that
/should/ be level however large; if used in situ you might have to jack
up one end to make it level now.

--
Max Demian
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charles Wrote in message:
In article , Jim K
wrote:
charles Wrote in message:
In article , Max
Demian wrote:
On 21/03/2018 23:10, Jim K wrote:
Max Demian Wrote in message:
On 21/03/2018 20:22, Jim K wrote:
Johnny B Good Wrote in
message:

It was not I who was obsessed with bridges needing to be
"flat", it was you. I think you are conflating Brian's mention
about 'flatness' and curvature of the Earth corrections with my
not being able to find a curvature of the earth divergence figure
for the Severn bridge to compare against the figure that Tim+ had
found for the Humber bridge. I made no mention of 'flatness'
until you introduced it into this sub-thread.

-- Johnny B Good


Oh dear. Put very simply, if one wasn't trying to build
something flat, why would one be bothered with calculations to
the mm to allow for curvature of the earth ? !

To ensure that it's curved to the right degree?

Such as a.........? (not a bridge shurely, if anything they are more
likely to be hump backed...)

A long, perfectly flat bridge deck would effectively dip in the middle
from a gravity POV. You would probably want it to follow the
curvature of the Earth.

Indeed, if you drive over one of these long bridges you are going "up
hill" to the centre and then down again on the other side.

-- from KT24 in Surrey, England


You can sometimes see ships going underneath too...


I try not to look sideways

--
from KT24 in Surrey, England


Blinkers?
--
Jim K


----Android NewsGroup Reader----
http://usenet.sinaapp.com/


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On Sun, 18 Mar 2018 14:11:00 +0000, David wrote:

Am I in a minority in being unable to set an accurate horizontal level
against a vertical surface like a wall using a spirit level?

There seems to be a degree(?) of variance between just touching and just
past the line for the bubble which seems to be beyond my ability to
discriminate.

Fall back is measuring up the wall from a flat surface.

A laser level might help (if I can get the level level, so to speak,
which comes back to the original problem).

What do the experts do?


Bought the Bosch level as recommended.

Looks good so far, except that the tripod will only reach up 4 feet.

Dug out my stock of tripods and I can gain about another foot, but I want
a line even higher up the wall.

So now trying to work out what I can position opposite the wall which is
tall enough AND broad enough to support the tripod so I can get the line
where I want it.

I can tilt the head, but I get the annoying flashing which says "I am not
level" and also I need to be sure that it is level from side to side.

Whatever do you do if you are trying to level a picture rail in a 18th
Century room with 10 foot (or higher) ceilings?

Ah well, nothing is easy.

Cheers


Dave R



--
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Looks good so far, except that the tripod will only reach up 4 feet.


Dug out my stock of tripods and I can gain about another foot, but I want
a line even higher up the wall.


So now trying to work out what I can position opposite the wall which is
tall enough AND broad enough to support the tripod so I can get the line
where I want it.


The usual process is to use the laser line as a datum line and measure up from it to the height required. If you repeat the measurement in two places then you can use use a chalk line to get a continuous line at the height you need.

Richard
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On 05/04/2018 14:14, David wrote:

Whatever do you do if you are trying to level a picture rail in a 18th
Century room with 10 foot (or higher) ceilings?


Some have an extending floor-to-ceiling pole which can be used to mount
the level at the right height - as eg in
https://www.screwfix.com/p/bosch-tp-320-professional-telescopic-pole/3921K?k

Some of us balance it on blocks a rung of a ladder leaning against the
wall


--
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reply-to address is (intended to be) valid
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On 05/04/2018 15:53, Robin wrote:
On 05/04/2018 14:14, David wrote:

Whatever do you do if you are trying to level a picture rail in a 18th
Century room with 10 foot (or higher) ceilings?


Some have an extending floor-to-ceiling pole which can be used to mount
the level at the right height - as eg in
https://www.screwfix.com/p/bosch-tp-320-professional-telescopic-pole/3921K?k


Some of us balance it on blocks a rung of a ladder leaning against the
wall


Sorry, that should have been "the opposite wall"

--
Robin
reply-to address is (intended to be) valid
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Default Levels and a level

On 05/04/2018 14:14, David wrote:
On Sun, 18 Mar 2018 14:11:00 +0000, David wrote:

Am I in a minority in being unable to set an accurate horizontal level
against a vertical surface like a wall using a spirit level?

There seems to be a degree(?) of variance between just touching and just
past the line for the bubble which seems to be beyond my ability to
discriminate.

Fall back is measuring up the wall from a flat surface.

A laser level might help (if I can get the level level, so to speak,
which comes back to the original problem).

What do the experts do?


Bought the Bosch level as recommended.

Looks good so far, except that the tripod will only reach up 4 feet.

Dug out my stock of tripods and I can gain about another foot, but I want
a line even higher up the wall.

So now trying to work out what I can position opposite the wall which is
tall enough AND broad enough to support the tripod so I can get the line
where I want it.

I can tilt the head, but I get the annoying flashing which says "I am not
level" and also I need to be sure that it is level from side to side.

Whatever do you do if you are trying to level a picture rail in a 18th
Century room with 10 foot (or higher) ceilings?


Stick a screw in the wall and hang it on that, or find something to clip
it to.


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Cheers,

John.

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Default Levels and a level

On 05/04/2018 15:34, Tricky Dicky wrote:

Looks good so far, except that the tripod will only reach up 4
feet.


Dug out my stock of tripods and I can gain about another foot, but
I want a line even higher up the wall.


So now trying to work out what I can position opposite the wall
which is tall enough AND broad enough to support the tripod so I
can get the line where I want it.


The usual process is to use the laser line as a datum line and
measure up from it to the height required. If you repeat the
measurement in two places then you can use use a chalk line to get a
continuous line at the height you need.


Or make up a storey stick - with a line to put the laser on, and then
another indicating your required level.

--
Cheers,

John.

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Default Levels and a level

On Thu, 05 Apr 2018 15:53:16 +0100, Robin wrote:

On 05/04/2018 14:14, David wrote:

Whatever do you do if you are trying to level a picture rail in a 18th
Century room with 10 foot (or higher) ceilings?


Some have an extending floor-to-ceiling pole which can be used to mount
the level at the right height - as eg in
https://www.screwfix.com/p/bosch-tp-...al-telescopic-

pole/3921K?k

Some of us balance it on blocks a rung of a ladder leaning against the
wall


Cool piece of technology!

However that is nearly as much as I paid for the bloody level!!!!

Cheers



Dave R

--
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Default Levels and a level

On Thu, 05 Apr 2018 18:45:41 +0100, John Rumm wrote:

On 05/04/2018 14:14, David wrote:
On Sun, 18 Mar 2018 14:11:00 +0000, David wrote:

Am I in a minority in being unable to set an accurate horizontal level
against a vertical surface like a wall using a spirit level?

There seems to be a degree(?) of variance between just touching and
just past the line for the bubble which seems to be beyond my ability
to discriminate.

Fall back is measuring up the wall from a flat surface.

A laser level might help (if I can get the level level, so to speak,
which comes back to the original problem).

What do the experts do?


Bought the Bosch level as recommended.

Looks good so far, except that the tripod will only reach up 4 feet.

Dug out my stock of tripods and I can gain about another foot, but I
want a line even higher up the wall.

So now trying to work out what I can position opposite the wall which
is tall enough AND broad enough to support the tripod so I can get the
line where I want it.

I can tilt the head, but I get the annoying flashing which says "I am
not level" and also I need to be sure that it is level from side to
side.

Whatever do you do if you are trying to level a picture rail in a 18th
Century room with 10 foot (or higher) ceilings?


Stick a screw in the wall and hang it on that, or find something to clip
it to.


Drawing pin in the ceiling and some thread?

Managed to balance my middle tripod on a chair with the tripod legs nearly
folded into the centre. Wobbled a bit but did the job.

Having pointed to a device which is basically a plaster's third arm with a
bit clipped to it, painted added value Bosch green I am now idly wondering
if I could do something similar.

Cheers



Dave R


--
AMD FX-6300 in GA-990X-Gaming SLI-CF running Windows 7 Pro x64

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Default Levels and a level

David wrote:

Robin wrote:

https://screwfix.com/p/telescopic-pole/3921K


that is nearly as much as I paid for the bloody level!!!!


Got one of those lidaldi ratcheting "dead man" props? Fix the level to
it with magnets/insulating tape/ty-raps/etc
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