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54 The Optical Magic Lantern Journal and Photographic Enlarger.
surplus gas that may be generated in excess of the burn>r capacity, and this is amply provided for in a peculiar manner, for as soon as the generating chamber is full of gas all overplus is sent automatically into the gasometer. This will, perhaps, be better understood on referring to the drawings, which are lettered as follows :—a, plate of calcium carbide holder ; B C, carbide holder ; p &, pipes for overflow gas from generator to gasometer ; F, pipe for cooling the gas; G, screw connection; H H, guides for the gasometer; 1, key for the tap R; KJ, inner and outer sides of gasometer with exit tap at J; M, water tank. Carbide is placed in
the holder n, which is then inserted upwards into the appliance shown at left-hand figure, when it is secured in place by means of bayonet joints. The key 1 must now be left off the tap R, which ensures that tap being closed, as the key can only be taken off when it is so. All above the calcium chamber is now air-tight, so that when the apparatus is inserted in the tank m, which should be filled with water, no
water will rise to the carbide until the con|
firmed air is liberated. The gasometer.x« u is now lowered into the water, the taps being left open so as to permit of all the air being ‘driven out as it sinks. Above what is termed the safety tap R are two taps with outlets, one
of which should be connected by a rubber tube of short length to the tap J, which'tap can now be closed. In order to generate gas it is only necessary to insert the key 1 on the tap pr, and give ita half-turn. The key, as stated, cannot now be removed. The confined air above the carbide will now pass out at the burners, which should be connected with the second tap above k, and in so doing the outside force of water allows the level of the water inside to rise; but on touching the carbide the internal pressure forces the water back again, and from now the generation becomes quite automatic’ in action, and passing through the spiral pipe? r
P By fe }
the gas becomes cooled. It may happen that the gas may be generated a little quicker than it is used, and in this case the gas-holder comes automatically into play; for when the water has all been forced out of the generator by reason of its being full of gas, the overplus goes
‘up the tubes p and £ into the gasometer spoken
of. As an example, to show the working of this, we will suppose the gasometer to be partly filled, and that it is wished to empty it. This is very simple. The tap r is closed, thus preventing the entrance of any water to the carbide holder, and the tap above r, to which the tubing from 3 had been attached, opened ; thus establishing connection between the