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 178
With.mirror folded down.* No. 24. 15-Inch Dumpy Level, With mirror attachment.Price, $100.00. No. 24 With mirror raised.* fHK A. I^ietz Company, Makers, San Francisco. Cal. … *The mirror when folded down serves as a protection to the spirit level; when raised, it in-dicates the position of the bubble at the eye end of the telescope, so that the observer may con-trol it without changing his position. ffiflP-For details of the Dumpy Level, see the back of this plate. No.…
Surveying
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