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1945 Theatre Catalog, 4th Edition, Page 259 (235)

1945 Theatre Catalog, 4th Edition
1945 Theatre Catalog
1945 Theatre Catalog, 4th Edition, Page 259
Page 259

1945 Theatre Catalog, 4th Edition, Page 259

keeping a firm grip on the hose nozzle so that the stream can be controlled instantly.

Gas Cartridge and Loaded Stream

Gas cartridge and loaded stream types are handled the same way, except that the extinguisher must be bumped on the floor or some other hard surface when inverted, so as to rupture the gas cartridge and release the gas it contains to expel the extinguisher stream.

Pump Tank

Pump tank extinguishers are carried to the fire by means of a handle at the top. The hose is directed with one hand while the pump is operated with the other,

Vaporizing Liquid

Vaporizing liquid extinguishers of the 1- to 2-quart size are usually mounted in wall brackets. With one hand, seize the handle, pull it from the bracket, and lift the extinguisher out of its bottom support. Grip the bottom of the extinguisher with the other hand, spraddling the nozzle with the index and middle finger. Give the handle a twist to the left to unlock it While carrying the extinguisher to the fire. Pump steadily and vigorously to expel the stream.

Carbon Dioxide

Carbon dioxide extinguishers are carried by a handle immediately over a release lever near the top of the cylinder. The larger units must be placed on the ground near the fire and the locking pin pulled out of the valve. Then the discharge horn is directed at the fire with one hand while the release lever is squeezed with the other. Care should be taken to hold the discharge horn only by the grip designated, for the escaping gas produces a refrigerating effect on the metal parts of the horn that will produce a ttburn" effect to the operator's hand if these metal parts are touched in operation.


In fighting Class A fires the stream should be directed at the base of the fire, not at the smoke or flames. Application should be continued until the fire is completely out and any sparks or glowing embers are thoroughly drenched.

Fires in dammable liquids (Class B tires) usually occur in either containers or spills. If foam, vaporizing liquid or a loaded stream extinguisher is used on a Class B fire in a container, the stream should be directed against the far, inside wall of the vessel just above the burning surface so as to permit a natural spread of the extinguishant back over the burning liquid without splashing. If possible, the operator should walk around the container while directing the stream so that the surface will be covered from all sides. The stream should never be aimed directly into the liquid.

If carbon dioxide is used, the discharge should be directed over the near wall of the container (not into the liquid) as close to the burning surface as possible, and the discharge horn moved slowly from one side to the other. The discharge should be continued until all possibility of reflash is over.

Spill fires are fought by starting at a point Opposite the source of the spill



and slowly sweeping the fire out while advancing toward its source. The spill fire should be completely out before fiames in a container are attacked.

Fires in electrical equipment should be fought in the same manner as those in ordinary combustibles, although it is best to turn the current off first to prevent reignition. With vaporizing liquid or carbon dioxide, the operator can approach as close to the fire as necessary before the switch is pulled. If water or watersolution extinguishers must be used, it is imperative that the equipment be made electrically dead before application begins.

General Rules

There are a few general rules that should be followed by anyone who ate tempts to fight a fire. The Operator should be careful first of all to stay as far from the flames as fire conditions and the effective range of the extinguisher will permit. With a 21/2-gallon soda-acid extinguisher the discharge carries a horizontal distance of from 30 to 40 feet; with a 15-pound carbon dioxide extinguisher the range is 6 t0 8 feet.

Secondly, the operator should maintain his position between the fire and a means of exit so that his escape will not be cut off by a sudden burst of flames.

If the fire is in a small, unventilated room, such as a storage or basement room, the safest procedure is to fight the fire from a doorway or window. All fires, especially those that occur where ventilation is poor, generate large quantities of carbon monoxide and other deadly gases. More people are killed in fires by poisoning and suffocation from smoke and gases than by burns. In theatres where ventilating systems cause strong air currents, however, the system should be shut down immediately upon the start of a fire so as to avoid feeding it fresh oxygen and causing it to spread.

Servicing Extinguishers

To be ready for instant use extinguishers must be inspected frequently, refilled immediately after use, and completely serviced at least once annually. This servicing need not be done all on one day, but can be carried on at spaced intervals and the dates entered on the inspection tags attached to each extinguisher. Soda acid and foam extinguishers must be recharged annually, if they have not been used and refilled during the year. Other types need recharging only after use. Replacement and recharging materials made by the manufacturers of the respective extinguishers should be employed.

THE VAPORIZING LIQUID EXTINGUlSHER contains specially processed carbon tetrachloride, which forms a heavy vapor on contact with burning material and, thus, smothers the fibre. The maieriul does not conduct electricity and does not freeze down to 50 degrees below zero. While the hand-pump type of this extinguisher is familiar, 1-, 2-, and 3-gullon extinguishers are also made. These are operated by a hand pump or by stored pressure.
1945 Theatre Catalog, 4th Edition, Page 259