Hatfield, Robert Griffith, 1815-1879. [from old catalog] · New York & London, Wiley and Putnam · leaf 21
isionsof the scale. An instrument in the form of a semi-circle, called aprotractor, and used for laying down and measuring angles, isof much service to surveyors, but not much to carpenters. 11.—In drawing parallel lines, when they are to be parallelto either side of the board, use the T-square;… … Fig-. 2. desired to draw one or more lines. Place any edge, as c d, ofthe set-square even with said line; then place the ruler, g h,against one of the other sides, as c e, and hold it firmly; slidethe set-square along the edge of the ruler as far as it is desired,as at/; and a line drawn by the…
Carpentry · Architecture
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