Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 59
Fig. 124. Fig. 125. The drawing or right-line pen (Fig. 126) consists of two blades with steelpoints, fixed to a handle; and they are so bent that a sufficient cavity is leftbetween them for the ink. The blades are set with thepoints more or less open by means of a mill-headed screw,so as to draw…
Mechanical drawing
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