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 (1889)
Fig. 36. or pencil, resting by its own weight on the paper, isguided round by gently turning, without pressure,the small knob at the upper end of the tube. By this .ft MECHANICAL DRAWING SELF-TAUGHT. means the misplacing or sliding of the centre-pointand the cutting of the paper by the pen are… … Fig- 37-In applying the ink to the bow-pen as to all otherinstruments, care must be taken that the ink lies be-tween the points only and not on the outside, for inthe latter case the ink will flow down too freely andmake a broad, ragged line, perhaps getting on thevl\^ of the square blade or…
Mechanical drawing
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