Cyclopedia of mechanical engineering; a general reference work. Editor-in-chief Howard Monroe Raymond. Assisted by a corps of mechanical engineers, technical experts, and designers of the highest professional standing (1908)
American School (Chicago, Ill.), Raymond, Howard Monroe · Chicago American Technical Society · leaf 145
Fig. 19.3. Another reason why the pattern for pipe elbows should be made,double is that otherwise the core prints would require to be made of Igreat length in order to balance, sustain, and keep the hea\7 core 133
Mechanical engineering -- Dictionaries
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