A treatise on surveying, comprising the theory and the practice ; (1887)
Gillespie, W. M. (William Mitchell), 1816-1868, Staley, Cady, 1840- [from old catalog] ed · New York, D. Appleton and company · leaf 358
king the lower edge of the openinganswer the same purpose as the wire in the other case. The same methods of verifica-tion and rectification are used aswith the first form of the in-strument. The instrument, in its thirdform, is simply a small steel cylin-der, 4 or 5 long, and j- in di-ameter,… … Fig. 355. 1^5j) CD g^ 344 LEVELING. the upper edge of the card, as seen reflected in the mirror, thesame as the wire in the first form. This instrument is the invention of M. Cousinery. WATER-LEVELS. 502. Continuous Water-Levels. These may consist of a channelconnecting the two points, and filled…
Surveying
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