Practical mechanical drawing and machine design self taught .. (1907)
Westinghouse, Charles. [from old catalog] · Chicago, F. J. Drake & co. · leaf 13
Fig. 8—Ruling Pen with Spring Blade. the upper blade springs open when the adjustingscrew is removed from the lower blade. A pensuch as the one just described is to be preferred toone with a joint, no matter how well made it maybe. Euling pens with broad nibs and flat handles,as shown in Fig. 9,… … Fig. 9—Ruling Pens with Wide Blades. The position in which a ruling pen should beheld when drawing lines perpendicular to the T-square is shown in Fig. 10. The drawing board
Mechanical drawing · Machine design
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