Mechanical drawing; a treatise on the drawing of mechanical and machine details (1920)
Jones, Franklin Day, 1879-1967 · New York, The Industrial press; [etc., etc.] · leaf 53
RAWING In Fig. 12, the T-square is shown in its normal position onthe drawing-board. Ordinarily all horizontal lines are drawnby the aid of the T-square which is moved as may be necessary,the head always being held in contact with the left-hand edgeof the drawing-board. Triangles. — Vertical lines… … Fig. 12. Drawing a Straight Line by using T-square to guide Pencil shown at A and B, Fig. 14. The one shown at A is commonlycalled the 45-degree triangle and has one angle of 90 degreesand two angles of 45 degrees. The triangle shown at B isusually called the 60-degree triangle and has one angle of…
Mechanical drawing
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