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)
In Figure 35 is shown a German instrument espeo PREPARATION AND USE OF INSTRUMENTS. 45 ially designed to avoid this slipping. The peculiarityof this instrument consists in the arrangement of thecentre point, which remains stationary whilst the pen … 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…
Mechanical drawing
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