A treatise on levelling, topography, and higher surveying (1876)
Gillespie, W. M. (William Mitchell), 1816-1868, Staley, Cady, b. 1840, ed · New York, D. Appleton and company · leaf 48
iple of the Diagonal Scale. Each tenth is bisected by a hor-izontal line, and the diagonals enable the observer to read tohundredths. ■ Conybewres Bod, Fig. 48. It reads to hundredths of afoot by means of the cross-hair bisecting the tops and bottomsand angles of hexagons. The odd tenths are made… … verniers placed side by side. It reads to hundredths, whichare given by counting up from the dot which the hair bisects,to the dot in the same vertical line which is bisected by one 30 LEVELLING, TOPOGRAPHY, AND HIGHER SURVEYING. of the horizontal lines which mark the tenths. The inventorclaims…
Surveying
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