The Sheet metal worker's instructor : for zinc, sheet iron, copper, and tin plate workers, and others, containing a selection of geometrical problems, also practical and simple rules for describing the various patterns required in the different branches of the above trades (1906)
Warn, Reuben Henry · Philadelphia : Henry Carey Baird & Co. · leaf 252
179 and so on. From the points where these in- tersect the side d c of the cone, as g e^i etc., drop perpendicular lines, cutting a f in the points 1, 2, 3, 4, etc., and from the points n Z, jh, other perpendicular lines as in the diagram. From / as a centre, with / 1 as a radius, de- scribe the… … / 10, 10, 11. Then from the point v, where the semi- circle 3, 8, cuts the line dropped from measure to 8, and set off this distance v 8 on a line h a', drawn at right angles to the cutting line e the distance h a' equal to v 8. Next from the point where the circle 4, 9 cuts the perpendicular 9 j,…
Sheet-metal work
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
