Practical mechanical drawing and machine design self taught .. (1907)
Westinghouse, Charles. [from old catalog] · Chicago, F. J. Drake & co. · leaf 14
ition ofthe T-square and triangle will avoid any possibil- DRAFTING TOOLS 11 ity of the shadows of the T-square blade or tri-angle being cast on the lines to be drawn. Sharpening a Ruling Pen. The blades of thepen should be curved at the points, and ellipticalin shape. To sharpen the pen, screw the… … Pig. 11—Complete Set of Instruments in Case. elliptical form. When this form has been secured,draw a folded piece of the finest emery paper twoor three times between the blades, which arepressed together by the screw. This will removeany roughness from the inner surfaces of theblades, these…
Mechanical drawing · Machine design
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