Practical mechanical drawing and machine design self taught .. (1907)
Westinghouse, Charles. [from old catalog] · Chicago, F. J. Drake & co. · leaf 20
e working edge of the drawing board should DRAFTING TOOL^ 17 be tested from time to time, as any unevennessin this edge will impair the accuracy of the draw-ing. Some draftsmen use the lower edge of theboard when drawing long lines parallel to theworking edge. This necessitates making this•edge… … Fiig. 27—Drawing Board with Cleats on Back. very thin edges in order that the T-square mayreadily slide over them. Lettering Triangle. A triangle or set-square forlaying out lettering is shown in Fig. 28. The useof this triangle is plainly indicated by its name. Section Liners. A section liner is a…
Mechanical drawing · Machine design
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