In answering a post it made me wonder how instruments are graduated for American use?
Here we have full 360å¡ circles.
But where your directions are south 30å¡ west for egs, what is your TS reading and what do you set it to?
Made me curious.
I couldn't work with that system, having grown up on our way but also working with old deeds that had descriptions following that format (N30å¡W) made me appreciate full circle bearings much easier to handle.
I expect it comes second nature to you though.
They read in angles right, not bearings. Bearings were used on the compass, easy to get the backsight bearing.
The traditional method on the transit was deflection angles, easier to calculate bearings.
Richard, post: 329044, member: 833 wrote: In answering a post it made me wonder how instruments are graduated for American use?
Here we have full 360å¡ circles.
But where your directions are south 30å¡ west for egs, what is your TS reading and what do you set it to?
Made me curious.I couldn't work with that system, having grown up on our way but also working with old deeds that had descriptions following that format (N30å¡W) made me appreciate full circle bearings much easier to handle.
I expect it comes second nature to you though.
I've always worked in the full circle, the bearings just get transferred to the deeds. Back in the day there were large books of place tables which went to 1/2 a bearing quadrant, I never used them or the Curtis, but that's one reason to work in bearings for computations.
Thanks for replies.
I'd meant to our mention my version of SurveCE shows both when inverse between so that too made me curious in COGO and input of traverse details.
As far as any angular orientation, many lay people hear have no or little comprehension when it comes to what a "bearing" means in relation to title plans.
I prefer Azimuth for calculation. Bearings make my head hurt, especially on a hot summer day and I'm trying to rotate something counter-clockwise by 3å¡05'47". Or determine the rotation between S 84å¡02'51" E and N 89å¡17å¡19" E. To do that I've got to subtract two numbers and then add the result - in DMS. Azimuths would reduce that work substantially. But tradition and all.
As for the gun, we site the backsight mark and set zero in the instrument circle rather than carrying azimuths in the gun.
I used to wonder why one would set 0å¡ for instrument backsight from the DC, but this too, makes sense now.
I used to set the true back bearing but it's a lot easier doing quick BS check if its 0å¡.
(Apologies about typos. I'd reset my keyboard to Swiftkey and its not very web friendly, unlike this one)
We demo'd the Leica TS-15 when it first came on the market several years ago. I remember sitting in the conference room with a bunch of surveyors and a Leica rep. Playing with the new gun I could not figure out how to set 0. Leica rep said that's not how it works and that we should be setting back azimuth. I called BS and said that is a derived quantity, not raw data. I want my data to be in the most raw form possible so that I can process it from control that might be processed or projected differently at a future date. The audacity of this rep left me wordless as I'd never heard a good derogatory term for the Swiss. Google is your friend however as I learned all kinds of good ones that afternoon, most of which I can't repeat on this site. Favorite clean one though is "Chocolate Chomping Matterhorn Monkey".
Within two weeks, Leica released a firmware update allowing setting 0 on the circle.
