Higbee, F. G · New York, John Wiley & Sons · leaf 108
PLANE SURFACES 97 Construction. In Fig. 78 is shown a hood such as might beused over a forge. To make a development of it first find thetrue size of the edge OA. At any convenient place on the paperlay off OA equal to ao, then with A as a center and AD as aradius strike an arc and with 0 as a… … Fig. 78. equal to the side of the hood, and continuing this process eachface of the hood may be laid out. The lips of the hood, or theportions lying below the line ABCD are laid off by constructingrectangles with one side equal to AD, DC, CB, and AB and theother side equal to the depth of the lip.…
Geometry, Descriptive
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