This section is from the book "Cassell's Cyclopaedia Of Mechanics", by Paul N. Hasluck. Also available from Amazon: Cassell's Cyclopaedia Of Mechanics.
The simplest form of trousers stretcher is that illustrated by Fig. 1; it is known as the " Invisible" trousers stretcher, as it is used by putting it inside the trousers leg. It is made of stout iron wire. The dimensions are as follows: A to B (Fig. 1), 30 in.; C to D, 29 1/2 in.; A to C, 14 1/2 in.; B to D, 15 in.; A to E, 4 in.; E to F, 14 in.
Of course, one is required for each leg. The device is patented. Another kind is that shown by Fig. 2, which is drawn on a larger scale than Fig. 1. Four pieces of wood, 1/2 in. thick and 11/2 in. wide, are required; two 16in. long, and two 13 in. Holes are bored near the ends, and the pairs are fixed together by small bolts and thumbscrews. The longer pair belong to the top of the stretcher. A metal socket is screwed on at A (Fig. 2) to receive the end of the bar, and there is a receptacle at B (Fig. 2) having a thread in it, through which the screw of the rod is turned. The rod, which is of metal, is about 33in. in length, and has a screw for about 6 in. of its length from the top. Trousers should be folded by bringing the two front brace buttons together with the left hand, and then taking each bottom at 3 1/2 in. from the side seam, and bringing them together also; the crease thus formed is the centre line of the leg. The trousers are thus laid in the stretcher, the bottom being fixed first, and the screws tightened; then the top as far up the leg as it will go, and the stretching is accomplished by turning the ring at the top. The articles should then be left for some time.

Trousers Stretchers.
 
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