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1945 Theatre Catalog, 4th Edition, Page 516 (490)

1945 Theatre Catalog, 4th Edition
1945 Theatre Catalog
1945 Theatre Catalog, 4th Edition, Page 516
Page 516

1945 Theatre Catalog, 4th Edition, Page 516

smaller types for special applications. At the present time, fixtures are not being manufactured, nor has the come pany carried on extensive promotional work, because in many instances the application requires special engineering technique, if the job is to be successful. Sylvania, for the present, prefers to have such work done through its own engineering department or through outlets having sutlicient engineering data. Sylvania manufactures a Type A and a Type B lamp in each size. The type A lamp produces a little more than half as much germicidal ultraviolet as Type B, but it utilizes a glass which does not transmit radiation short enough to produce ozone. These lamps are recommended for school rooms, offices, and similar locations where the general public would be exposed to air irradiated by the lamps for extended periods. Type B lamps, which utilize a glass said to be the same as that used by other manufacturers, produce enough ozone, particularly during the first 100 hours of operation, to be objectionable in many cases. Type B lamps could be used, for example,

in a theatrels air-conditioning ducts where air turbulence, moisture, and heat would tend to eliminate the ozone.

Westinghouse WB-44 Units

The Westinghouse Electric Corporationls rather recent Sterilamp Conditioner, Model WBs44, combines the lamp, sockets, and builtein transformer into a unit. The redector is designed to give ultraviolet radiation only in the space above the eye level. The styling and color of the fixture harmonize with wall and room decorations. It comes complete with an eight-foot cord, and is ready to be plugged into any convenient 110-Volt, (SO-cycle, alternating-current outlet.

WB-44 conditioners should be mounted six and a half to seven feet from the door. Radiation is cut off at an angle of one degree above horizontal, shielding eyes from direct radiation. The horizontal spread of radiation, for maximum utilization comes when the unit is placed in the center of walls and not in corners where a portion of the radiation would be

FOR MEASURING THE INTENSITY OF THE GERM-KILLING RAYS, the Model SM-bOO selective ultraviolet meter, an adaptation of the well-known light meter, has been developed. Here Dr. Harvey C. Rentschler, director of research for the Westinghouse Electric Corporation's lamp Division, is shown measuring the ultraviolet strength of a Sterilamp, such as are considered here. Doctor Rentschler is one of the pioneers in the utilization of ultraviolet light as a practical means of effecting complete air sterilization. (Westinghouse Electric Corporation photograph.)


Table showing the number of Sterilamp fixtures recommended for sanitizing rooms of various areas and conditions of occupancy.

Number of WB-M Conditioners forFlaor space up tor

Limited Congested

Occupancy Occupancy 100 sq. ft. 1 1 150 sq. ft. 1 2 250 sq. ft. 2 2 300 sq. ft. 2 3 375 sq. ft. 3 500 eq. ft. 3 4 600 sq. ft. 4 4 750 sq. ft. 4 5 800 sq. ft. 5 5 1000 sq. ft. 5 6

absorbed by the wall.

The number of units required is determined by the number of occupants of the room and, therefore, the amount of infection in the air, and by the area of the room. The accompanying table is calculated on the basis of providing a degree of air sanitation comparable to one complete air change every minute.

The use of germicidal lamps in rest rooms and lobbies should be considered. Not only are these areas of high bacteria count#and should, therefore, be sanitizedebut the soft blue glow of the lamp, mounted in plain sight, constitutes highly effective advertising. With the aid of a sign, the patron can be constantly reminded that powerful ultraviolet rays of similar lamps, located within the airconditioning system, protect him in any part of the theatre from infection by airborne bacteria.

In many cases the standing of a theatre is determined by the fittings and the maintenance of the rest rooms. Advantage should be taken of every sanitary aid to keep these rooms serviceable and attractive. Germicidal ultraviolet radiation is an effective agent in reducing odors and sanitizing wash bowls, toilet seats, and wall and floor surfaces. Rest rooms and smoking rooms should be equipped with indirect radiation while the toilet rooms may have direct radiation over the toilet stalls and wash bowls. Some shielding of the direct rays of a region 3 to 6 feet from the door may be needed in some installations. One 30-inch St ri> lamp should be installed for the irradiation of two toilet stalls.

Sterilamps in a theatre are an aid to the box office during epidemics as they can be depended upon to reduce the danger of cross infections from patron to patron in the auditorium. In the lobbies where people may be crowded at times the ultraviolet radiation will reduce the bacteria count and to that extent reduce the danger of contagion. In aireconditioning' systems the operation of the proper number of Sterilamps in the plenum chamber or air duct will insure the supplying of practically germ free air to the air conditioned rooms in the theatre. The treatment of the air by mans of germicidal ultraviolet is comparable in the purification of the air to the more common and better known purity controls of water and milk supplies. It is another element in the protection of public health.


1945 Theatre Catalog, 4th Edition, Page 516