Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 55
£ Fig. 116. C … Fig. 117. The T square is a thin straight-edge or ruler (Fig. 117), fitted at one endwith a stock, applied transversely at right angles. The stock being so formed DRAWING INSTRUMENTS. 39 as to fit and slide against one edge of the drawing-board, the blade reachesover the surface, and presents an…
Mechanical drawing
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