It is a difficult matter to find large tanks of suitable proportions on the market, but a wooden tank for fixing and washing film negatives can be easily built in accordance with the plans herewith. The tank may be built of one inch cypress, white pine or white-wood.

Referring to the accompanying diagrams, "Fig. 1" shows the top view of a three section tank. This will accommodate either 8x10 or 4 3/4x 6 1/2 film developing hangers. The width of the box is 10 3/4 inches inside measurement and each of the three compartments will take 16 8x10 developing hangers or 48 in the three compartments, and by removing crossbars over 50 hangers can be handled at one time. The crossbars are spaced 7 3/4 inches apart which gives room for the 4 3/4 x 6 1/2 developing hangers. These crossbars should be 1 1/2 inches wide, otherwise the ends of the hangers will hit each other when being moved back and forth. The box will accommodate seventy-two film hangers. The crossbars should also drop down into the tank 2 1/2 inches, so as to extend below the shoulder of the developing hanger and prevent it from sliding sideways. A three compartment tank built of one inch material measures 28 1/4 inches in length, 12 3/4 inches in width and 12 inches high outside measurements.

"Fig. 2" shows a side elevation of the tank. The dimensions for either a washing or fixing box will be the same, but the intake and outlet openings are required for a washing tank only. However, a hole at the bottom of the box at one end with a plug may be desirable for draining oft the hypo bath.

The tank can be built by a carpenter and we would suggest fastening it together with screws, using white lead in joints, and offsetting them in the manner shown in the accompanying sketch. A perspective view of the box with hangers is shown in Fig. 3.

Top View of Tank.

Fig. l. Top View of Tank.

Side Elevation of Tank.

Fig. 2. Side Elevation of Tank.

To render wooden tanks water proof and to prevent warping they should be coated with tar, an acid proof paint or black asphaltum varnish. A tank built in this manner is very serviceable and inexpensive to build.

If a larger or smaller tank is required, it can be built with any number of compartments. If only 8x10 films are to be handled the removable crossbars will not be required.

The Finished Tank.

Fig. 3. The Finished Tank.

Eastman Portrait Film, Artura Print From a Demonstrator's Negative.

Eastman Portrait Film, Artura Print From a Demonstrator's Negative.

Eastman Portrait Film. Artura Print From a Demonstrator's Negative.

Eastman Portrait Film. Artura Print From a Demonstrator's Negative.