Who needs a spirit level - Router Forums
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post #1 of 32 (permalink) Old 12-13-2019, 02:28 AM Thread Starter
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Default Who needs a spirit level

At least for vertical work.
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post #2 of 32 (permalink) Old 12-13-2019, 03:54 AM
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They may have used this contraption way back in ancient Egypt.Could be handy.James.JJ
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You can't drive a bridge spike with a tack hammer(so I'm told)
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post #3 of 32 (permalink) Old 12-13-2019, 04:09 AM
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Quote:
Originally Posted by jj777746 View Post
They may have used this contraption way back in ancient Egypt.Could be handy.James.JJ
I believe you are right...
https://golftips.golfweek.com/histor...-bob-1191.html
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post #4 of 32 (permalink) Old 12-13-2019, 09:07 AM Thread Starter
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Well done Stick.
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post #5 of 32 (permalink) Old 12-13-2019, 04:20 PM
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Definitely a handy device. Wonder how many are actually in use today? We relied on those for setting large wall forms on dam spillways. Only problem was on very windy days.
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post #6 of 32 (permalink) Old 12-13-2019, 07:39 PM
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My first year training cruise Machining project was to make a plumb Bob from a tolerances drawing. Tapered point, milled flats, cross-drilled holes, and more.

I don't know what ever happened to it.

2nd year project was a Machinist screw clamp. Just like the wood working ones, just a lot smaller and all steel.
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post #7 of 32 (permalink) Old 12-13-2019, 10:57 PM
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Ancient Egyptian is exactly right.
http://www.surveyhistory.org/egyptia...ing_tools1.htm

A simple low-tech way of determining vertical in one or two planes.
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post #8 of 32 (permalink) Old 12-14-2019, 12:47 AM
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And none of them are cordless.

For those who have never visited the Smithsonian Museum, in Washington D.C., they have a plumb bob, hung from the ceiling - a very tall ceiling - at the entrance to, if I recall right, the Natural History Museum. This plumb bob swings, because of the rotation of the earth, and the length of the string. At the end of the swing length they sit up a ring of small pieces, couple of hundred maybe. They all sit on marked spots, and the plumb bob, swinging back and forth and around, knocks over these little pieces, one at a time. Takes quite awhile to knock all the pieces over, but very interesting. Every time I visited, there was always a circle of kids sitting on the floor around the whole thing, waiting for another piece to be knocked over. Used to visit the Smithsonian every 3 months or so, when I was assigned up there. My most favorite place in D.C. Oh yes, the best time of year to visit there is in the middle of winter, loads less people then, and can usually park no more than 3 or so spaces from the front door. That's because of all the people visiting Disney.
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post #9 of 32 (permalink) Old 12-14-2019, 01:11 AM
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Foucault s pendulum. A great demonstration.
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post #10 of 32 (permalink) Old 12-14-2019, 02:10 AM
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I used one ,and carried one in my tool belt for 45 years and we used them constantly. It is sure handier than packing around a 6' level, and you never had to wonder if it was right on. The elevator installers used a 5 gal bucket full of sand hung on a piano wire to plump the rails in the elevator shafts. Sometimes we hung a 20# brass bob in a bucket of motor oil to dampen it if we were bobbing a point up to the upper floors of a tall building like 240 feet.
I have plumbed hundreds of door jambs in office building with the bob. Even with all the laser equipment it is still used in commercial carpentry today.
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Last edited by Herb Stoops; 12-14-2019 at 02:14 AM.
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