A treatise on surveying, comprising the theory and the practice (1906)
Gillespie, William Mitchell, 1816-1868, Staley, Cady, 1840- · New York D. Appleton · leaf 366
th obliqueillumination. The Austrian Scale substitutes 50° for 45° in Lehmanns scale,and has ten grades of shade, using the same convention for slopesof r to 5°. The United States Coast and Geodetic Survey Scale of Shadeand Working Scale.—Lehmanns scale, from 5° to 25° inclusive, THE VERTICAL… … yond 40° the increased intensity of shade is produced by keeping thesame space between the hachures as for 40°, while increasing thespace in which a certain number of hachuresare placed by 25 per cent for a 45° slope, 50per cent for a 55° slope, 75 per cent for a 65°sl6pe, and 100 per cent for a…
Surveying
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