Mechanical drawing self-taught: comprising instructions in the selection and preparation of drawing instruments, elementary instruction in practical mechanical drawing together with examples in simple geometry and elementary mechanism, including screw threads, gear wheels, mechanical motions, engines and boilers (1883)
ouch the paper at a point only, this point beingthe apex of a fine curve; that this curve be equal oneach side of the point of contact w^ith the paper; that ^O MECHANICAL DRAWING SELF-TAUGHT. both halves forming the pen be of equal thicknessand width at the pointed curve; and that the point beas… … crFigures 27. 28. 29. 30. 31. 32. is shov/n magnified), thus bringing both halves to anedge of exactly equal length, and leaving the pointflat at D. These flat places must be parallel to oneanother and to the joint between the two halves of thepen. As the oil-stone may leave a slightly raggededge,…
Mechanical drawing
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