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The Optical Magic Lantern Journal and Photographic Enlarger. 37
developed, for which purpose the following is recommended :—
Amidol...........cce cee eas ¢ ounce. Sulphite of soda .......... Water ce issies cdiacoutaiaas 20 ounces.
After development the prints are washed, and then placed in the ordinary fixing bath.
BON ACCORD ACETYLENE GAS GENERATOR,
Bon Accord is the name given to the acetylene gas generator issued by Messrs. A. & J. Smith, of 23 & 25, St. Nicholas Street, Aberdeen, On reference to the illustration, it will be seen that it consists of a large and a small cylinder or tank. Into the larger one water is poured until it reaches within a few inches of the top, the inner bell or tank to which the handle is attached having first been removed. Inside the bell ig suspended a holder for a supply of calcium carbide. This holder having been charged, is then placed inside the bell, and
is conducted to its correct position by wire guides, when a half-turn suffices to retain it in position. This, then, is inserted in the water tank, and the outlet which is at the top of the small cylinder opened, so as to allow of the escape of air until the basket of carbide reaches the water, when up goes the container by reason of some gas having been generated. When first lighting up, the fiame will be of a blueish character owing to the air present, but after this has escaped, the light from the flame becomes intense. The small cylinder, which is
connected with the tank by means of a standpipe reaching above the level of the water, is charged with pumice stone in small lumps for further cooling and drying the gas, and at the foot of this small cylinder will be found a tap, by means of which water may periodically be removed from the small cylinder or condenser, In fitting up the burners for the lantern, Messrs. Smith provide two of different size, that next to the lantern condenser being 00000, and the other 0000. The apparatus is well and strongly made.
KINEMATOGRAPH,
The firm that controls the kinematograph which is in daily use at the Westminster Aquarium, is the Anglo-Continental Phonograph Company of Brook Street, E.C. The general appearance of the machine will be seen from the illustration. The film is placed in the
circular metal box above the projection lens, whence it passes between the condenser and
lens on to the projections on the spocket wheel. For running the machine a 4-volts motor isemployed; a worm, on being revolved, engages with the spocket wheel, causing it to turn sufficiently to present a given portion of the film. When this worm enters on ‘a plain” it makes the film remain stationary a moment, during which timeitis projected. This movement is repeated for each picture on the length of the film. For many months this machine has been in use at the Westminster Aquarium, with a 20-amp. Arc lamp, although for small discs limelight will suffice. The same mechanism on