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 182
the bubble must be illuminated by holding under it apiece of white paper or some light object. Combinations are made and kept in stock, wherein thislevel is supplied with an azimuth compass, so that directionsmay be obtained as well. The higher-class combinations havea graduated plate, and admit of… … CD 6 CM CO o . o 10 in CM <N . & 2 o a. H55W H gO > D CO HW U o Ph Q< > w wo GERMAN LEVEL AND POCKET SURVEYING INSTRUMENT. No. 25. Instrument mounted on strong tripod; ball and socket movement with clamp;horizontal movement with clamp and tangent screw; needle and compass, the…
Surveying
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