Posted by bc on December 21, 2020 at 21:15:49 from (45.21.235.60):
In Reply to: OT land surveying posted by steve-in-ga on December 21, 2020 at 06:33:05:
I follow you PJH if rotate means to rotate the transit on its axis on its base 180 degrees but you need to explain what flip is. By flip do you mean to pull the transit out of its base and reinsert while pointing in the opposite direction, or to unscrew the transit base {with transit attached to its base) from the tripod and rotate the base in the opposite direction 180 degrees, or else mean to rotate the entire tripod 180 degrees.
So what I was thinking about with the vertical centering is wrong. I guess you can still shoot elevations with the helper walking down the hill, have a long pole, or use the stadia lines on the transit to calculate the elevation.
I've used them around construction for shooting elevations and it isn't rotated more than 45 degrees or so. If you rotate it back and the cross hairs land on the same level at the start then the transit is level. If not then adjust the leveling screws till it does read the same after rotating it.
Guess I didn't realize that a precision built instrument could be tilted just a little bit. Suppose adjusting on leveling screw to compensate would totally mess things up when rotating 180 degrees. Have to wonder how accurate the instruments were around 150 years ago and how accurate the chainmen were walking along yelling chain, stuck, out, set a point, and tally.
I'll have to watch the auctions and pick one up. Everyone seems to be going to these total station type measuring devices so I see transits at auctions except they want to sell like 3 together instead of one by itself.
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