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 young person who likes to draw will find the device illustrated of great assistance for outlining a portrait or a bit of scenery which can be filled in to make the picture. The camera consists of a box without a cover, about 12 in. long, 6 in. wide and 4 in. deep. An oblong hole is cut in one end, a small hole bored in the other, and a piece cut out of the lower edge so that one eye can be placed close to the hole. The oblong hole, shown by the dotted lines, is covered with a fine perforated cardboard, the kind used for working in mottoes with yarn. Supports are nailed in the corners of the box, their length being calculated to allow the operator To sit or stand, as desired. The camera is used in the manner illustrated. If a portrait is to be drawn, then the one sitting for it must be quiet until the outlines are completed. The operator, looking through the hole, traces the lines on the cardboard between the perforations. When the outlines are drawn in this manner, the cardboard Is removed and placed on the paper or cardboard used for the picture. The outline is then transferred by marking with a sharp-pointed pencil through the perforations on the outlines as drawn. After separating the two pieces, the markings can be connected with a continuous line and an exact outline will be obtained which can be filled in as desired. The outline picture is a sample of work done with the camera. - Contributed by Florence Thomas, Gordon, Ont.
Ill: Outlining a Portrait on the Perforated Paper Placed over the Oblong Hole in the Camera