The naval architect's and shipbuilder's pocket-book of formulae, rules, and tables and marine engineer's and surveyor's handy book of reference (1884)
Mackrow, Clement · London, C. Lockwood and co. · leaf 21
12 GEOMETRY. 20. To find t-Jic development of the fruxtum of a right conejvhen cut hy an amjle inclined to the base. (Fig. 20.) … Let ABCD represent the requiredfrustum of the cone ; continue the linesAC and BD till they meet in e ; dividethe base of the cone into any number ofequal parts—say, 12—in the points 1, 2,3,vN:c. ; join these points to E; next findthe development of the base of the cone,as shown in the preceding…
