A practical workshop companion for tin, sheet iron and copper plate workers : containing rules for describing various kinds of patterns used by tin, sheet iron and copper plate workers : practical geometry, mensuration of surfaces and solids, tables of the weights of metals, lead pipe, etc., tables of areas and circumferences of circles : japans, varnishes, lackers, cements, compositions, etc., etc., etc. (1876)
Blinn, Leroy J · Philadelphia : Henry Carey Baird & Co. · leaf 66
Let the circle FE, fig. 55, equal large pipe or boiler; makeAB equal to the diameter of the collar or branch pipe, BE theangle required ; describe the semicircle ACB; divide the semi-oirclo into any number of equal parts; from the points draw linesparallel to BE, as 1, 2, 3, &c. FOR DESCRIBING… … Set oflF the line ABC, fig. 56, equal in length to the circumfer-ence of the collar AB ; erect the perpendicular lines AD, BE andCH; set off on each side of BE the same number of equal dis-tances, as in the semicircle ACB; from the points draw lines par-allel to BE ; make BE equal to EB; make AD…
Metal-work · Workshop recipes
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