Wild T-3 repair
@dave-ingram Curious if you have any advice? Would be much better and less confusing if I could align/adjust a little more than a minute out. See the image. btw. the image is made available from the battery box and light I purchased from you last year. Thanks for that. 🙂
Are you talking about the index line? being off when you rotate the drum to 60 seconds?
If its the index line that never lines up that is a easy fix.
Larry Scott & along sorry for not getting back to you on the question of the index line on the T3 Theodolite.
This is an easy fix. Please give me several days to set my T3 up again and to make sure I give you exact
directions since I have not done it in 20 years. Mine is in adjustment but I will take it out and put it back in adjustment and take good notes.
By the way this is one of the faults of the T3. It can go out of adjustment(index line) just by setting it down to hard.
John Nolton: that is interesting that you say it can happen so easily. I do have a T3, but never used this particular instrument in the field, I mainly just play around with astros here at the office. In the past I used a T3 to do 150 astro azimuths on a bluebook project back when doing a single observation with GPS was very costly, so we set azimuth marks with astro obs rather than pairs of points. Mid 80's.
When I worked for the Corps, I always used a T2, older model in the bullet case. On one occasion working in WV (very steep hills) I set the bullet down, and it tipped over and started rolling down the hill, and ended up about 100 feet down crashing in to a tree. The only damage was it knocked the vertical out to about 4' on the split, easily adjusted back to spec.
My current T2 lays flat in a hard plastic case. I was leery at first, I remember being told not to let the T2 lay on its side. But at least it won't roll down a hill. And it is well cushioned in the case.
I just acquired a 1950 Mils T2. It’s a gem.
It had an optical plumb, and the leveling screws and does not have tribrach interface.
Compared to much newer mils T2 and the angles return the same Std Dev: 0.6”. (After accounting for micro scale error.)
Mils T2 micrometer reads 0.002 Mils, and the spacing on the micro easily reads 0.001 Mils. which is 0.2”. So, the T3 gets a lot more shelf time.