Crawshaw, Fred D. (Fred Duane), b. 1874, Phillips, J. D. (James David), 1869- joint author · Chicago, New York, Scott, Foresman and company · leaf 126
e PENCIL MECHANICAL DRAWING 121 and those drawn with the triangles does not depend upon theangle of the blade to the head of the T-square. It is not neces-sary, therefore, that the edge of the head and blade be exactlyat an angle of 90° to each other. Care should be taken to preserve the upper edge… … Fig. 124. Ruling a Horizontal Line hand as shown in Fig. 124. The lines are always drawn alongits upper edge. The triangles are used in combination with the T-square fordrawing lines at certain angles to the horizontal. They are usedin combination with each other for drawing lines at variousangles…
Mechanical drawing
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