This section is from the book "The Boy Mechanic Vol. 2 1000 Things for Boys to Do", by Popular Mechanics Co.. Also available from Amazon: The Boy Mechanic, Vol2: 1000 Things for Boys to Do.
The device shown in the sketch is a great help to the maker of mission furniture as a guide on short cuts. It consists of two pieces of wood, A and B, preferably of oak, fastened together at right angles by two large flat-head screws. The pieces should be placed exactly at right angles.
Ill: The Saw Teeth Edge can be Run through Both Pieces, the Stock being in the Corner
A cut is then made through both pieces. The cut on B should be exactly at right angles to the surface of piece A. This device can be either clamped on a board or merely held by hand, and will insure a true cut - Contributed by F. W. Pumphrey, Owensboro, Ky.