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 69
ect the perpendicular lines AD,BE and CF; set off on each side of BE the same number of equaldistances, as in the semicircle CDE; fcom the points draw linesparallel to BE; make BE equal to BE ; make AD and CF equaltc FC ; also, each of the parallel lines bearing the same numberas 22, 33, 44,… … Let ABC, fig. 59, eqnal the pitch of a roof; let DF, lEf, be theDipe ; draw the line BG parallel to HF; draw the line DF at rightangle to HF; describe the semicircle DEF; divide one-half thesemicircle into any number of equal parts; from the points drawlines parallel to FH, as 2, 3, 4, &c. FOB…
Metal-work · Workshop recipes
Internet Archive · Getty Research Institute · Public Domain Mark 1.0. Free to use for anything.
