. Cyclopedia of architecture, carpentry, and building : a general reference work .... distance of the flange D A in elevation in Fig. 79and place it at right angles to the line D D, D C, C D as shownHispectively by A A, A A^and A^ A-^, which completes the halfpattern with laps allowed as shown The pattern for the collar E F G H inelevation in Fig. 79 is simply a straightstrip of. metal, equal to the circumferenceof O P It in plan. It is often the case that two unequalpipes are to be connected by ilieans of atransition piece as shown by A in Fig. 82,the ends of the pipes being cut at rightangle
. Cyclopedia of architecture, carpentry, and building : a general reference work .... distance of the flange D A in elevation in Fig. 79and place it at right angles to the line D D, D C, C D as shownHispectively by A A, A A^and A^ A-^, which completes the halfpattern with laps allowed as shown The pattern for the collar E F G H inelevation in Fig. 79 is simply a straightstrip of. metal, equal to the circumferenceof O P It in plan. It is often the case that two unequalpipes are to be connected by ilieans of atransition piece as shown by A in Fig. 82,the ends of the pipes being cut at rightangles to each other. As the centers ofboth pipes are in one line when viewed in plan, making bothhalves of the transition piece equal, the problem then consists ofdeveloping a transition piece, frdm a round base to a round topplaced vertically. Therefore in Fig. 88 draw 1 5 ecpial to 2_^ inches,and at an angle of 45° draw 5 6 1^ inches. At right angles to 1 5draw G 10 4 inches long and draw a line from 10 to 1. On 1 5 drawthe semicircle 1 3 5, and on G 10 draw the semicircle 6 8 Fig. 82. 158 SHEET METAL WORK 87 Divide both of these into equal spaces as shown, from which drawlines perpendicular to their respective base lines. Connect oppositepoints as shown by the dotted lines, and construct a diagram of
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