Roof Framing Made Easy a Practical And Easily Comprehended System Adapted to M
Roof Framing Made Easy a Practical And Easily Comprehended System Adapted to M
Owen B Owen Bernard Maginnis
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A D be- ing the major axis of the bottom edge. To obtain the covering boards produce E B and F C to P, and divide the semi- ellipse E Q F, into twelve equal parts. Join each division point with P, and draw from each down at right angles to E F, cutting E F at b, c, d, e, f, g, h y i, j> k> I- With the centre P, through b, c, d, e, f, etc. , draw b M, c N, d O, e P, /Q, g R, // S, / T, /U, k V, and /W, cutting A D, in the points M, N, O, P, Q, R, S, T, U, V, W. From these points draw lines down ...perpen- dicular from A D, cutting the semi-ellipse A X D. Now to obtain the curve of the covering board which will bend over A E F D. From P draw P Z, square to P C, and make P Y equal to / I, at elliptic curve. Make P V equal to k 2, and so on up to g Q. Next with F as cen- tre and F i as a radius describe the arc at F, and from Y, at top, draw Y A', tangent to the arc. Similarly from V, and with a similar arc draw V B 7, and so on to Z F'. Draw through the points where the arcs are tangent to the lines to obtain shape of top curve for covering board.
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