Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 190
perpendicularsmay be constructed with much greater facility than by thechain. § 10. The Theodolite. The telescope of the transit can perform a complete revo-lution on its axis; whence the name transit. The theodolitediffers from the transit chiefly in that its telescope cannot be sorevolved. It is… … 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.
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