The sheet-metal worker's guide : a practical handbook for tinsmiths, coppersmiths, zincworkers, etc., comprising numerous geometrical diagrams and working patterns, with descriptive text (1888)
Crane, W. J. E. (W. J. Eden) · London : Lockwood and Son · leaf 80
CHAPTER IV. PATTERNS. To descnbe an envelope for a cone. Let ABE (Fig. 60) be the given cone. From e as centre, and with the radius e a, describe the arc c d ; make c d equal in length to the circumference of A B (which is rather more than three times), … Fig. 60* draw the lines o e and d e, when the figure c d e will be that of the required covering for the cone- Edges for folding or lapping should be allowed by drawing the lines parallel to c e and d e, as shown by the dotted lines.
Sheet-metal work
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