· Binding Posts 1 and 2 will give 2 volts
· Binding Posts 2 and 3 will give 8 volts
· Binding Posts 1 and 3 will give 12 volts
[Illustration: FIG. 64.—A detailed Drawing showing how the Sides of the
Case are formed by bending a long strip of Sheet Iron at four points.]
The drawings in Figures 64, 65 and 66 will be of assistance to those who wish to enclose the transformer in an iron case instead of mounting it on a board.
The case is made of sheet iron. The sides are composed of a strip of sheet iron fifteen and seven-eighths inches long and two and three-quarters inches wide. The strip should be bent at four points so as to form a rectangular box, the sides of which are four and three-sixteenth inches long and the front and back, three and nine-sixteenths.
The ends of the strip should overlap about three-eighths of an inch and be riveted or soldered.
The bottom may be fastened to the sides with a couple of rivets or by soldering at one or two points.
The bottom and top of the case should both be the same. They are made from a rectangular shaped piece of sheet iron four and seven-eighths inches long and four and one-quarter inches wide.
A notch five-sixteenths of an inch square is cut out of each corner and the sides and ends then folded down along the dotted lines as indicated in Figure 65.
[Illustration: FIG. 65.—Details of the Top and Bottom of the Case.]
The transformer is laid in the case with a small block of wood under the core at either side so as to raise the windings up off the bottom. The secondary terminals are connected to binding posts marked 1, 2 and 3 in Figure 66. These binding posts are mounted on insulating bushings which pass through the holes marked No. 1, No. 2 and No. 3 in Figure 64. The insulating bushings consist simply of fibre washers so that the binding posts will not short circuit on the metal case.