Manual of modern surveying instruments and their uses .. (1893)
Lietz, firm, math. instr. makers, San Francisco. (1893. The A. Lietz company) [from old catalog] · [San Francisco] The Company · leaf 166
CO in S w | £ E 1 ii … LO SIMPLIFIED TRANSITS. No. 15. Possessing a single center; horizontal leveling screws operating against a ball ina socket. The horizontal plate is graduated to read to minutes by one vernier placednear the eye end of the telescope. Compass needle and graduated compass ring, withvariation plate.…
Surveying
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