Had a chance to break out my personal three meter and two meter invar rods and the micrometer today for some regular compression monitoring.
The three meter invar rod with bipod.
Got to screw with one of the guys and made him try to keep BOTH bubbles in the circles. The invar rods come with two seperate bubbles on the back and keeping both in the circles takes a caffeine free morning.
Mike attempts the impossible with a two meter invar rod.
Tim reading and Andrew recording micrometer readings on the WILD NA-2.
The NA-2 with micrometer and invar rod has a precision (but not accuracy) of ten microns.
Or about the width of a single human blood cell.
I love breaking this equipment out.
It scares the heck out of all the other surveyors.
Connection to the monitoring points are made with invar meter and half meter scales and running the numbers is always a pleasure.
Make sure that you clean the chewing gum off the sidewalk before that level run.😉
Scott-
Ben almost 45 years since I was microlevelling the Toronto Star presses with similar concept equipment.
We had fixed legs.
Forgetting much, is there a reason for not using fixed legs ?
Cheers
Derek
Is there anything you work on or with that isn't cool?
Busting out the ol turning turtle...
IInvar Micrometer Leveling
I haven't done anything like that since 78, setting rails for a 60 ton GE turbine compressor.
Used a fixed tripod so short I had to lay on my stomach and my rod was 1 foot high.
Yes the literature usually says a direct reading to .1mm and estimated readings to .01mm. I always thought that was a little bit of a stretch. I would put it at estimated readings to .02 or .03mm. If you strip the tenths off of a 25' pocket tape, I don't think I could reliably estimate to the nearest tenth.
Stephen
Scott,
used this setup more then 20 years ago,
thanks for sharing!
chr.
In 1988-1989, ran a 130 mile second order class I line with the same equipment. Digital makes it so much easier. But, I wish I still had the rods and a tilting level for crossing bridges.