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.
Upload one or more videos to your post. Photo and video filesizes should be less than 8MB. Formats allowed are gif, jpg, png, ogg, mp4, mov, and avi. Be sure to use filenames without spaces or special characters, and filetypes of 3 digits lower case.
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]
Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
... [Read Article]
Latest Ad:
1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
[More Ads]
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.
