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How to do an inverted plumb shot

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Strictly Surveying

Last Post by Dan Patterson 12 years ago

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pdop 1.0

(@pdop-10)

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A few weeks ago I posted my variation on a tack ball, made from the magnets of an old hard drive.

Well I have found another use for parts of that old drive, I have been carrying the spindles around , use it reflect the sun down into manholes when doing as built or inverts of deep manholes, provided its sunny , makes for the best torch.

But today their real use was discovered…

Problem : how to mark a beacon / point on top of a high pillar cap of a wall, cant climb it and have no ladder ?

Solution : Take the hardrive spindle, screw it underneath the receiver and bam you are good to do a below bubble plumb shot on something above your eyeline. Lucky the diameter hole of the spindle matches the pole.

Worked like a bomb.

Posted : November 28, 2014 1:39 pm

jhframe

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Neat idea! I'll have to play around with that a bit.

Posted : November 28, 2014 1:45 pm

thebionicman

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That's a good idea. I carry a World War 1 shaving mirror with a drill hole in the center. I may have to upgrade after seeing that...

Posted : November 28, 2014 1:46 pm

brad-ott

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Noice.

Posted : November 28, 2014 1:50 pm

a-harris

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"Most excellent"

:gammon:

Posted : November 28, 2014 2:16 pm

Dave Ingram

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:good:

Posted : November 28, 2014 2:27 pm

davidgstoll

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THAT is one hella good idea!

Dave

Posted : November 28, 2014 2:58 pm

conrad

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I do the same thing by turning on the front facing camera on my smartphone, holding it above the bubble, and watching the bubble on the screen.

Posted : November 28, 2014 3:24 pm

Chris -LLS

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Great idea. Surveyors are usually the innovative ones by necessity.
I usually use the mirror on my Silva Ranger, but sometimes I can't reach that high.

Posted : November 28, 2014 3:53 pm