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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)

Rose, Joshua · Philaelphia, H.C. Baird & co.; [etc., etc.] · leaf 81

An illustration from 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, leaf 81
outer shell is shown to be in one piece from end toend, because the crossmatching is not only equallyspaced, but the diagonals are in the same direction ;hence it would be known that D, F, H, and E wereslots or recesses through the piece. The same re-marks apply to piece B, wherein G, J, K are… … end, notwithstanding that the two ends are completelysevered where the slots G, I, come, because thespacing and direction of the. cross-hatching are equalon each side of the slots, which they would not be ifthey were separate pieces.

Mechanical drawing

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