A practical work-shop companion for tin, sheet-iron, and copper-plate workers ... with numerous valuable receipts and manipulations for every-day use in the work-shop (1904)
Blinn, Leroy J. [from old catalog] · Philadelphia, H. C. Baird & co. · leaf 114
roceed the same as described above. OCTAGON OR SQUARE TOP OR COVER. To describe an Octagon or Square Top or Cover.—De-scribe a circle, three-quarters of an inch larger in diameterthan a circle that will cut each corner of the article the topor cover is for; set off the squares from B to C (Fig.… … f;^. !o8. where the arcs GD and HD intersect, draw the lines AEand AF, also the lines BE and CF. STEAMER COVER. To describe a Steamer Cover.—Describe a circle one inchlarger in diameter than the hoop after the edge is laid off;lay the hoop on the plate, allowing an edge each side, as
Metal-work
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-400-277.webp)
