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)
ss with the trianorle of 60 as before; thetriangle of 45 is then used to draw the four lines, b, c,d, e, joining the ends of lines i, j\ k, /, and touchingthe Inner circle, a, a. The outer circle is then pencilledin, touching the lines of division where they meet thelines b, c, d, e, and the rest… … Fig. 176. where It is desired to draw a chuck-plate having 6slots. The trlano^le of 60 Is used to draw the centrelines, a^ b, c^ etc., for the slots. From the centre, thearcs e, f, g, h, etc., are marked, showing where thecentres will fall for describlno- the half circles formlncrthe ends of the…
Mechanical drawing
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