A treatise on surveying, comprising the theory and the practice (1906)
Gillespie, William Mitchell, 1816-1868, Staley, Cady, 1840- · New York D. Appleton · leaf 365
was made to the rule given above, and the same map space whichfor a 5° slope is covered with 5 hachures, has but 4 hachures for a 354 TOPocRArnr. 4° slope, 3 for a 3° slope, etc. In Lehmanns standard workingscale the width of a hachure for a o° slope is specified at one ninthof a millimetre. From… … Usually the number of hachures per inch will be determined bythe scale of the drawing, 40 to 60 per inch being usually employed. Fig. 523 shows a map on the vertical system with obliqueillumination. The Austrian Scale substitutes 50° for 45° in Lehmanns scale,and has ten grades of shade, using the…
Surveying
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