The tinman's manual and builder's and mechanic's handbook : designed for tinmen, japanners, coppersmiths, engineers ... with compositions and receipts for other useful and important purposes in the practical arts (1861)
Butts, I. R. (Isaac Ridler), 1795-1882 · Boston : I.R. Butts & Co. · leaf 31
To cut for pitched covers, draw a circle one inch larger than thehoop is in diameter after burring, then draw a line from the centre to^ 3 26 OVAL BOILER COVER. the circumference as in the figure, and one inch from the centre andconnecting with this line draw two more lines the ends of which… … From C as a centre, descrihe a circle whose diameter will he equalto tlic width of the boiler outside of the wire, and draw the line ABperpendicular to the line EF, having it pass through the point D, whichis one-half of the length of the boiler ; tlicn mark the point J onequarter of an inch or…
