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 75
THE CONE. Ot3 points 1, 2, 3, 4, &c., and from the points n l, jh, … P Fig. 56. other perpendicular lines as in the diagram. From / as a centre, with / 1 as a radius, describe
Sheet-metal work
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
