Image from page 283 of "Cyclopedia of architecture, carpentry, and building : a general reference work ..." (1907)
Authors: American School of Correspondence
Publisher: Chicago : American Technical Society
Contributing Library: NCSU Libraries
Digitizing Sponsor: NCSU Libraries
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Text Appearing Before Image:
Fig. 177. the radius r s strike the semicircle shown. Above tliis .semicirclepunch the hole Y. Before the patterns can be obtained for the hip and jack bars, aquarter plan view must be constructed which -^-ill give the points ofintersections between the hip bar and curb, between the hip bar andvent, or ridge bar, and between the hip and jack bar. Therefore, fromany point on the center line A B as K, draw K L at right angles to A B.xAs the skylight forms a right angle in plan, draw from K, at an angleof 45°, the hip or diagonal line K 1°. Take a tracing of the commonbar section E with the various figures on same, and place it on the hipline K 1° in plan so that the points 1 4 come directly on the hip asshown by E^ Through the various figures draw lines parallel to K 1° 287 PATTERN FORCC^MON BAR ^CUT FOR UPPER END^ OF JACK BAR
Text Appearing After Image:
SHEET ^lETAI. WORK 149 one-half of which are intersected by vertical Unes drawn parallel to AB from similar points of intersection 1 to 6 on the curb, and 1 to 6on tlie ventilator in the half section, as shown respectively in plan byintersections 1° to 6° and V to 6^. Below the hip line K 1° trace theopposite intersection as shown. It should be understood that thesection E^ in plan does not indicate the tiue profile of the hip bar(which must be obtained later), but is only placed there to give the hori-zontal distances in plan. In laying out the work in practice to full size,the upper half intersection of the hip bar in plan is all that is requu-ed.It will be noticed that the points of intersections in plan and one halfsection have shnilar numbers, and if the student will carefully followeach point the method of these projections \y\\\ become apparent. Having obtained the true points of intersections in plan the nextstep is to obtain a diagonal elevation of the hip bar, from which
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