Hatfield, Robert Griffith, 1815-1879. [from old catalog] · New York & London, Wiley and Putnam · leaf 265
f. Divide two adjacent sides, as a 2 and 2 1, intoas many equal parts as there are quarters in the number of revo-lutions, as seven ; from those points Of division, draw lines acrossthe square, at right angles to the lines divided; then, 1 being thefirst centre, ^, 3, 4, 5, 6 and 7*, are the… … Fig. 299. 398.—To describe the scroll for a hand-rail over a curtailstep. Let a b, (Fig. 299,) be the given breadth, If the givennumber of revolutions, and let the relative size of the regulatingsquare to the eye be |- of the diameter of the eye. Then, by therule. If multiplied by 4 gives 7, and 3,…
Carpentry · Architecture
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