MAKING BELLOWS WITH CARDBOARD STRIPS.
Another very convenient way of making square bellows is to employ strips of board, which are covered with binders' cloth or black twill. Cut a ber of strips of cardboard 1 in. wide and 7 in. long, also a similar number 5f in. long, and slope off all the ends as shown by Fig. 919. On a flat table lay a piece of cloth of sufficient size for the bellows, coat it with strong paste, and lay on the strips of card, nearly touching each other : 14 of the long est, then 14 shorter, then 14 long, and again 14 shorter, as in Fig. 929 ; let them dry, then paste another layer of bookbinders' cloth over them, the card strips being sand wiched between. When nearly dry, fold them up after the manner of a fan and put twill should be used. About yds. by yd. each of leather and twill will be required. Pin the material face down on a table, and draw a line A A (Fig. 930) in the centre of one edge. From the centre of
this line erect a perpendicular a II i0 in. long. At the top draw a line e c at right angles on both sides 5 in. long, and then draw lines joining the points c A and C A. The angles for other sides are found as follows : With a blunt compass, taking care not to pierce the material, describe a circle with centre A and any radius. Where the circle intersects C A as centre, and where under pressure till quite dry ; then, first of all, crease them sharply and longitudinally in each part where .the ends of the shorter cards meet the longer ; bend the whole into a tube, and glue the edges together. When the glue is thoroughly dry, pinch up the corners, and the bellows are complete, ready to be glued into the back and front frames, to which they are secured by screw ing on additional strips of wood.