The Printer may be Set in the Table Top or Used Separately, as Desired
An ordinary single-pole switch was secured, as shown in [Fig. 1], also a small mousetrap, as shown in [Fig. 2]. The front part of the trap was sawed off so that only the spring was utilized. The base of the trap was then cut out to fit snugly on the base of the switch, into which two corresponding holes were bored for the screws. The next thing was to secure several clips, which were cut from sheet brass, to operate the switch, and a lever to control the switch, as shown in [Fig. 3]. The lever is 1 in. wide and 4 in. long, having a slot at the bottom, to slip easily over the lever handle in the switch, and a hole, drilled 1 in. above the slot, to admit a nail to keep the spring from throwing it out of position. The clips for holding the films, or plates, are shown in [Fig. 4].
Side View of the Printer, Showing Parts Assembled and the Main Line Connections to the Globes
After securing a double socket, of which there are many types, a few yards of lamp cord, a piece of felt, 6 by 8 in. in size, and two ordinary lamp sockets, I was ready to assemble the printer. The switch was then placed on a board of the same width, the spring of the trap placed on top of it and then fastened with screws. This board was then cut off the length of the inside of the box and fastened in place, with the switch and trap spring on top.
The ruby light A burns all the time, acting as a pilot in placing the negative. When the cover B is lowered, after placing the paper, the felt pad on the under side holding it secure, the projecting arm C comes in contact with the switch lever D and makes the connection to the tungsten light E. After the proper time for the exposure has been given the cover is raised and by this action the tungsten light is automatically shut off, leaving only the red light burning. With a 60-watt lamp I secure a print in about 3 seconds, which is fast enough. Of course, by using a larger lamp, the time could be reduced to a second or more, according to the size. The time given was obtained by experience in using ordinary brands of papers.—Contributed by Harry Marcelle, Honolulu, H. I.
Transposing Temperature Readings
The Readings can be Transposed from Fahrenheit to Centigrade or Vice Versa Instantly by the Use of This Scale