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)
the design of WilliamH. Hoffman. The cross-sectional view of the boiler-shell in Figure 316 shows the arrangement of thetubes, which, having clear or unobstructed passagesbetween the vertical rows of tubes, permits the steamto rise freely and assists the circulation of the water.The dry pipe (which… … Side SectionFig. 3lf
Mechanical drawing
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