Several companies built this instrument, among others Brunson, Dietzgen. Repeat with BS on previous FS to "Close the horizon". The Arsenal icon used to feature a soviet hammer and sickle symbol in a prism. Subtract angle on last pointing on BS from 360, divide by two, add to 1st pointing as "reduced angle". You can also turn "T2 angles" : BS, FS,Flop, FS, BS - All done with upper motion. BS original FS & repeat to "Box the angle". If your error is within spec, you subtract your final angle from 180, and divide diff by 2 to add to angle recorded in 1st pointing. Divide your doubled angle by 2 and compare to 1st Hz you turned. Absolutely amazing vintage Dietzgen survey transit with built in level. Sight the BS with the angle loaded, then break loose the Upper Hz motion and turn to the FS again.Ĭongrats, you just "Doubled an angle". Then you'd flop, break lose the Lower motion to carry the Hz angle back to the backsight. Ĭhances are you won't be able to mic a perfect zero to backsight with this thing, so you'd load up something close to zero on the micrometer and BS with the lower motion, then break loose the Upper motion and turn to FS, and mic up the Hz angle. This theodolite is going to have Vertical motion and micrometer, Upper horizontal motion and micrometer, and a Lower motion that swings the whole Hz plate. This instrument is marked 'DIETZGEN 10823.' Dietzgen introduced the form around 1920, termed it a Highway Transit, and was still offering in the late 1930s. (Transits were open metal plates, had no optical plummet, had 4-screw leveling bases, etc) Yeah, like u/majorkev noted, that is a 30" theodolite, not a transit.
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