Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 192
THE SURVEYORS TRANSIT. INSTRUMENTS AND THEIR USES. 19 § 12. Plotting. The principal plotting instruments are a ruler, pencil,straight-line pen, hair-spring dividers, diagonal scale, a righttriangle of wood, and a circular protractor. A T-square willalso be found convenient. … Fig. 13. The Diagonal Scale. A portion of this scale is shown in Fig.13. AB is the unit. AB and AB are divided into tenequal parts, and B is joined with h, the first division point tothe left of B; the first division point to the left of B is joinedwith the second to the left of B, etc. The part of…
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