Davies, Charles, 1798-1876 · New York, Cincinnati [etc.] American book company · leaf 40
FiQ. 18. SEC. III.] INSTRUMENTS FOE PLOTTIXG. 33 SECTION III. INSTRUMENTS FOR PLOTTING. 43. The ordinary implements for making a diagram or plotof a survey are—drawing board ; T-square ; dividers ; ruler andtriangle ; scale of equal parts ; semicircular protractor. … Pig. 13. « 44. A Drawing Board (Fig. 13) is a rectangular Vjoard ofabout 24 by 30 inches, fths of an inch thick, made of severalpieces of well seasoned white pine, fitted together with the grainrunning in different directions to prevent warping. It isimportant that its angles should be perfect…
Surveying
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