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Taupenot's and the Wothlytype Processes

arranged the yellow light so that it falls nicely | the albumen and pour it on and off twice to disupon the surface of the film, hold it quite level and pour on oz. of water, waving it backwards and forwards. It should not be poured on entirely at one spot, or too much of the nitrate of silver would be displaced, producing a circular mark of imperfect development. As, however, a vacant space of a quarter of an inch in breadth is usually • allowed at each end of a stereoscopic plate, this will be found convenient for pouring on the water, which must be allowed to run into each corner until greasiness has disappeared. It will probably touch the fingers by which the plate is held, and when they are not scrupulously clean, stains will, in consequence, result. After pouring away the water (which ought then to measure at least 3 drs. if the operation was well performed), drain the plate for an instant, and it will be ready for the albumen.

The Albumen Solution.

Take the white of a fresh egg and add to it 1 oz. of distilled water with 3 drops of strong ammonia. Shake for 10 minutes in a bottle, and pour out the liquid on a filter previously wetted.

Apply the filtered albumen twice or thrice to the film in the same manner as collodion. Then pour water over the plate for a minute, in order to remove the excess of albumen, and afterwards rear the glass on end to drain upon blotting paper.

When the plates are perfectly dry they are ready for exposure.

Development.

This process is not quick as regards development. When pyrogallic acid is used, each drachm of the liquid is previously mixed with about 5 minims of a solution of nitrate of silver, containing 20 grains to the oz. of water. The film is wetted and the mixed developer poured on and off from a glass measure.

Fix with hyposulphite of soda.