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By Harry Jenkins

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For the half-tone, One room more cameras, but it is is and B for the often used for two or advisable, if possible, to provide separate apartments for the cameras, thus avoiding interference of one operator with another. 1 and 4 are the darkrooms. These may be constructed with walls of ordinary flooring joined to - be light-tight. They should contain sinks 3 and 5, over each of which should be placed a tap for washing the negatives. At the right of the sink there should be placed a shelf for holding the bottles of developer and other solutions.

After sunning, the bath should be carefully filtered, and, in order that it may give clear images, a few drops of pure nitric acid added until blue litmus paper will be turned red if placed in the solution. The bath is now placed in its holder, but must be " iodized" before good results can be obtained with it. If a collodionized plate is sensitized in the plate when taken from and be of a it now, the bath will look thin light bluish color, and will give a weak, MANUAL OF PHOTO-ENGRAVING. 36 This is due to the fact that in a fresh bath the silver salts when formed in the film are To prevent dissolved out by the silver solution.

27 open box is used, but it is better to have a closet built around it to prevent the powder from being13 is a bench for a gas carried about the room. 14 and 16 are stove for burning in the plates. etching tubs, placed near the windows, to obtain ample light. 15 is a sink or a bench to hold a tray 17 is of water to rinse the plates after etching. window for printing lamp should also be pro- a shelf placed outside of the by daylight. An electric vided for the printing. THE FINISHING ROOM. D is the finishing room in which numbers 18 to 24 and 25 are 23 represent the several machines.

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