The little gold mine. Conklin's handy manual of the mechanical arts and house plans .. (1889)
Conklin, [George W.] [from old catalog] · Chicago, Laird & Lee · leaf 396
ed, divide the arc orcurve r to a into six equal parts ; if an elbow of three piecesor sections is wanted, divide same into four equal parts.From point c for a four-piece elbow, draw line c to s. andfrom point ?/, where inner curve of elbow intersects line r x,draw line n to / parallel to line c r,… … 39^and 0 on outer curve, give the miter de- FlG. curve to pointssired. I have also shown asmaller-sized elbow inthe drawing to show howthe rule works, and isapplied on same. It is,of course, not necessaryto give the same size ofthroat as is given in thedrawing, nor the sameoutside sweep. This…
Industrial arts · Workshop recipes · Architectural drawing
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-242-152.webp)
