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)
Fig. 92. Section sliacling or cross-hatching niay sometimes(.iiise the lines of tlie drawing to appear crooked tothe eye. Thus, in Mgure 92, the key edge on the): ;ht aj)pears nirvixl inwards, while on tlu; Ic ft SHADOIV LINES AND LINE SHADING. gi the key edge appears curved outwards, although… … Fig. 93. in Figure 93 on the right-hand edge of the key, butnot on the left-hand edoe.
Mechanical drawing
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