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82 MCINTOSH BATTERY AND OPTICAL CO., CHICAGO, ILL., U. S. A. It is better to have a large size bag, because some gas is needed in preliminary adjustment, and as there will always be a slight varia- tion in amount used during an entertainment, and for two hours’ work a bag 30 x 40 inches is most desirable. Only the best bags are worth having, and such will last for years if the gas is properly washed an'd all taps and metal fittings are cleaned and oiled occasionally. All bags we furnish are tested with a much greater weight than it is ever necessary to use in working either a single or dissolving' Stere- opticon. When bags are used for both gases , care should be observed to keep each bag for its particular gas , as explosions have been caused by using f e oxygen bag for hydrogen, and vice versa. To obviate mistakes of this kind, it is well to have some distinguishing feature about the bags, so that even in the dark they can be readily identified. PRESSURE BOARDS. These Pressure Boards are hinged together in the form of a wedge shaped box, with handle and lock, in which the gas bag is carried. It is shown closed and locked, ready for transportation. The dotted lines show the position of the cover when the bag is filled with gas. I he cross-bar prevents the weight from rolling off, and keeps it on the forward part of the bag; this position distributes the pressure more evenly than if placed in the centre of the cover. The ba°- can be carried without folding or creasing, and is protected from splinters and roughness of floors when in use. This form of pressure board adds considerably to the durability of the gas bag. A single pressure board may be employed if preferred ; it can be made by any carpenter. It should be not less than 32 x 42 inches, perfectly smooth on the surface next the bag. On the lower edge of its upper surface is fastened a batten to hold two strap hinges ; the free ends of these hinges are screwed to the floor. Six inches back of the upper edge is another batten to hold the weight in place.