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1945 Theatre Catalog, 4th Edition, Page 257 (233)

1945 Theatre Catalog, 4th Edition
1945 Theatre Catalog
1945 Theatre Catalog, 4th Edition, Page 257
Page 257

1945 Theatre Catalog, 4th Edition, Page 257

Because so much of the foam is water, it is also an effective cooling medium.

Soda acid and foam extinguishers must not be exposed to freezing temperatures, and if kept in unheated areas should be placed in suitably heated cabinets. Antifreeze chemicals must never be added to the contents.

Gas Cartridge and loaded Stream

In gas cartridge and loaded stream types, a small cartridge of carbon dioxide gas in the neck of the extinguisher supplies the means of discharge of the extinguishing agent. The gas cartridge type contains water as the extinguishant, to which antiefreeze chemicals approved for the purpose may be added. The loaded stream type contains a solution of water and an alkali-metal-salt mixture which will not freeze down to 40 degrees Fahrenheit below zero. One 21/2-gallon extinguisher of either type is rated as a unit for Class A tires; for Class B fires, two loaded stream extinguishers of 21/2gallon capacity constitute a unit of protection.

Vaporizing Liquid

The vaporizing liquid extinguisher contains specially processed carbon tetrachloride, which forms a heavy vapor on contact with burning materials and thus smothers fire. It is a non-conductor of electricity and does not freeze down to 50 degrees Fahrenheit below zero. Two 1-quart extinguishers are rated as a unit of protection for either Class B or C fires; one l-gallon extinguisher is a unit of protection for Class C fires.

The 1-, 2- and 3-gallon extinguishers of the vaporizing liquid type are carried by a handle at the top and operated either by a hand pump or by stored pressure. The hose should be held with one hand and the pump or valve manipulated with the other. The valve for the stored pressure type is located on the head casting.

Carbon Dioxide

The carbon dioxide extinguisher contains liquid carbon dioxide which is discharged as a gas which smothers fire. It is a non-conductor of electricity and requires no protection from freezing temperatures. One 15-p0und extinguisher is a unit of protection for either Class B or C fires.


With the basic knowledge of the classes of fire and their respective extinguishing agents now in mind, let us examine the theatre to determine What protection its points of hazard require.

Proiection Room

First and most important is the projection roomasource of 50 per cent of theatre fires. This is the only room in the building for which there are well established regulations with respect to fire protection equipment, and theatre operators will naturally be guided by them.

In addition to whatever automatically operated equipment may be installed to meet the regulations, there should be at least one hand extinguisher for Class A fires and one for Class C fires immediately outside the projection room. In some states, it is required that a Class C


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THE CARBON DIOXIDE EXTINGUISHER (above) contains the gas in liquid form. When the pressure is released, turns into a gas which smothers the tire, Carbon dioxide neither conducts electricity nor freezes in cold weather.

THE FOAM EXTINGUISHER, shaped like the soda-acid extinguisher, also contains sodium bicarbonate in solua tion and, in addition, a foam stabilizing material. Instead of the acid, there is aluminum sulphate. When the extinguisher is inverted, and the two materials mix and pressure is created and there is discharged a foam which blankets the'burning maierial and smothers the tire. These extinguishers should be recharged after use.

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1945 Theatre Catalog, 4th Edition, Page 257