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)
tjuare blade.Tlie triangle may be turned over, set to ()()iiu /andline ^ drawn, and by turning ih<- iriuuLjIc a-ain the LINES AND CURVES. 69 line s may be drawn from point r; finally the trianglemay be again turned over and line 7t drawn, whichrenders the drawing of the circle ;;/ unnecessary.… … in each half 01 the square, the diagonals E F, G H.From P as a centre with the radius P R draw thearc S E R. With the same radius draw^ from O asa centre the arc T D V. With radius L C drawarc R C V, and from K as a centre draw arc S B T. A very near approach to the true form of a trueellipse may…
Mechanical drawing
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