The Sheet metal worker's instructor : for zinc, sheet iron, copper, and tin plate workers, and others, containing a selection of geometrical problems, also practical and simple rules for describing the various patterns required in the different branches of the above trades (1906)
Warn, Reuben Henry · Philadelphia : Henry Carey Baird & Co. · leaf 291
218 What is the convex surface of the frustum of a right cone, the diameter at the greater end being 10, at the lesser 6 inches, and slant height 15^ inches ? •7854x100 = 18-54 •7854X 36=28-2744 106-8144 3-1416x10 = 31-4160 3-1416X 6=18-8496 50-2656 15-5 = 15^^ inches. 2513280 2513280 502656… … To find the solid content and convex surface of a sphere or globe ; also to find the solid content and convex surface of the segment of a sphere or globe. Rule 1. — Multiply the cube of the diameter by •5236, and the product is the solid content. Rule 2.— Multiply the square of the diameter
Sheet-metal work
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
