A treatise on architecture and building construction . Fig. 30. proper weight box, and the other details of construction areprecisely similar to those described in connection with , except that, owing to the curvature of the sill and head,the details of the framing do not join at riglit angles, andthe semicircular shape of the window head demands specialconstruction. 65. To unfold or develop this semicircular window head,we proceed as follows: Draw a line a a from the insideedges of the pulley stiles, and from each end of it erect the 50 JOINERY. 10 perpendiculars a b, which will be equi
A treatise on architecture and building construction . Fig. 30. proper weight box, and the other details of construction areprecisely similar to those described in connection with , except that, owing to the curvature of the sill and head,the details of the framing do not join at riglit angles, andthe semicircular shape of the window head demands specialconstruction. 65. To unfold or develop this semicircular window head,we proceed as follows: Draw a line a a from the insideedges of the pulley stiles, and from each end of it erect the 50 JOINERY. 10 perpendiculars a b, which will be equivalent to the contin-uation of the inside faces of the pulley stiles. Above theplan, draw the line b b parallel to a a, and with the pointwhere this line intersects the axial line nfaX d a center, b c. Fig. 31. and (ib as a radius, draw the semicircle bfb, which will bethe elevation of the inside line of the window head. Nowdivide one-half of this semicircle bfb into any number ofc(|ual parts, by points //, v, w, x, etc., and from these pointslet fall perpendiculars to an, as shown at x I, zuj\ vh, etc. § 10 JOINERY. 51 Somewhere below the phm, the line aa iti then drawn,parallel to a a, from the eenter // of which is laid off in eachdirection the lengths ;//, ij\ f Ji\ etc. each equal to thelength of the curved lines/.i, xiv, luv, etc., and, from thepoints so established, perpendiculars to aa, as ;//, lq\f r\ hs, etc., are erected. On these perpendiculars arelaid off iio and /// equal respectively to no and up, I inand / q equal to I in and / q, f k and/ r equal Vojk and//-,etc. These measurements are taken from the plan, wherethe perpendiculars from the subdivisions of the semicirclebfb intersect the curved lines aoa and ///, shown in theplan of the sill. Curved lines drawn throu
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Keywords: ., bo, bookcentury1800, booksubjectarchitecture, booksubjectbuilding
