Blueprint reading; a practical manual of instruction in blueprint reading through the analysis of typical plates with reference to mechanical drawing conventions and methods, the laws of projection, etc (1919)
Fairfield, Howard Parker, 1858-, Kenison, Ervin, Waite, Edward B. (Edward Broughton), 1873-, American Technical Society · Chicago, American technical society · leaf 266
Fig. 165. Isometric of Fig. 164 Fig. 164. Plan and Elevation ofOblique Pentagonal Pyramid the back face are found by projecting the front centers back 30 degrees equal to the thickness of the prism, as shown at a and b. Pyramid. The plan and elevation of an oblique pentagonal pyramid are shown in… … of the pyramid can be drawn in isometric as either vertical or 30-degree lines; hence a system of co-ordinates must be used as shownin Fig. 165. This problem illus-trates the most general case;and to locate some of thepoints three co-ordinates mustbe used, two at 30 degreesand one vertical.…
Mechanical drawing · Blueprinting
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