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1945 Theatre Catalog, 4th Edition, Page 520 (494)

1945 Theatre Catalog, 4th Edition
1945 Theatre Catalog
1945 Theatre Catalog, 4th Edition, Page 520
Page 520

1945 Theatre Catalog, 4th Edition, Page 520


to be agreement among scientific investigators that an intensity of 0.0l watt of 2537-Angstram energy will kill

63.2 percent of the bacteria in one minute; 86.5 per cent in two minutes; 95 per cent in three minutes; over 99

It will

FIGURE 4.-A typical installation of the Hygeaire system within a theatre auditorium is here illustrated.

be observed that six Hygeaire units are required for efiicient air disinfection within this space with dimensions

approximately 50 x No feet and a ceiling height of 25 feet.

per cent in Five minutes; 99.9 per cent in seven minutes; and 99.99 per cent in nine to ten minutes. (All drawings have been especially prepared for presentation in this article by the attaches of American Sterilizer Company.)

The elliptical curves in front of each unit demon

strates the distribution of the ultraviolet energy in watts to the square foot. At the present time, there seems


Recent studies have demonstrated that a single sneeze contributes about 100,000 bacteria to the air, the organisms coming from the oral and nasal discharges and traveling at an initial velocity of approximately 150 feet a second. It has been demonstrated that over 4,000 of these bacteria remain suspended in the air for approximately 30 minutes after the sneeze. The simple act of ordinary speech or even the respiratory cycle of an infected person or a carrier of streptococci results in a discharge of organisms into the surrounding atmosphere. If this infected air is then inhaled, the organisms can readily resume their role as disease incitants.

The need for air disinfection within the theatre auditorium is clearly demonstrated by a survey reported in the American Journal of Public Health for August, 1939. The analysis of various air supplies (Table 2) clearly indicates the need for radiation to reduce the number of bacteria and the danger of cross infection.

TABLE 2-Analysis of air supplies, showing the number of bacteria in the air in diiferent situations.

Number Number of of Situation Tests Bacteria

Outdoor air, city street. 143 112

Outdoor air, city park..- 13 30 Indoor air, after sneezing 14 3090 Indoor air, theatre 253 72 Indoor air, schools .. .. .. . 707 296 Air-conditioned railway

cars, ,. .. .. H .. 16 440


It should be recognized by everyone that the application of ultraviolet radiation for the disinfection of air within the theatre auditorium is still in the experimental stage. The theatre owner or man 'ager should be extremely cautious to ob serve any exaggerated claims on the part of individuals attempting to promote the sale of equipment. While some very definite and practical information is available at the present time, there still remains much to be done in the accumue lation of accurate data as to the efhciency and clinical effectiveness of the installation whether it be in the air conditioning system or directly installed within the theatre auditorium.

Following the installation of the Hygeaire system within the Narrows Theatre, Narrows, Virginia, the management found that they were able to discontinue entirely the use of their regular dim lights and the ultraviolet units gave a very superior light in this respect. In fact, several patrons mentioned that they were able to find their seats much more easily while the show was in progress than was possible by means of the conventional dim lights. The theatre management has conceded that this is an additional advantage.

1945 Theatre Catalog, 4th Edition, Page 520