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1945 Theatre Catalog, 4th Edition, Page 397 (373)

1945 Theatre Catalog, 4th Edition
1945 Theatre Catalog
1945 Theatre Catalog, 4th Edition, Page 397
Page 397

1945 Theatre Catalog, 4th Edition, Page 397

cannot be calculated. The air is discharged in only a single plane and simply blows against and down the walls. Under such circumstances, the entering air is difficult to control and must be supplied at a temperature close to the room temperature. There is no pre-mixing of the air and there is only a limited mixture with theatre air. Further objections are the unequal distribution of the air within the theatre, and streaking of the ceiling by the incoming air.

In earlier days. the cooling effect of conditioned air was over-advertised outside the theatres by the signs that we still remember, such as HArctic Breezes," ttSiberian Zephyrs Inside? tiGreenlandis Icy Mountains," ttNever over 70 Degrees," and "Cooled by Refrigeration." The last phrase often made one think of a cold-storage plant or an unheated house. Coolness or warmth, however, did not necessarily mean comfort, especially in those days when the humidity was kept high, for it cost plenty to keep it down. In theatres where humidity is kept high, this is an added reason for using a good air-diffuser to prevent uneven distribution of humidity with its accompanying areas of clamminess.


Fortunately, research has not been static. Complete and modern testing facilities now exist where all variations of temperature from extreme heat to extreme cold have been tested with various volumes and velocities of air in different types of outlets. Research in air distribution culminated in the type of air diffuser shown in the accompanying illustrations, a device known as the Anemostat. Its name is a tough word, not easily spelled or pronounced. The Greeks, who had words for everything, are responsible. They had "anemosf meaning wind and "statikos" meaning causing to stand. So we draw out the Anglicized combination to mean a device which

THE MANAGEMENT of the Centre Theatre, Baltimore, drafts by blowing in larger volumes of "not quite so cold" conditioned air, but finally turned to Anemostat air diffusers for the solution of the problem. The equipment is shown here installed in the ceiling of the theatre's auditorium.


had tried to eliminate


THE METAL CONES of the Anemostat are designed so that air of any duct velocity, passing between them, creates a series of counter-currents of theatre air. At the same time, air expansion within the cones converts

air-velocity energy into a blanket pressure on the air below. In this way, supply air is are-mixed with about a third of its volume of theatre air before it is spread throughout the theatre in a series of slow-moving blankets.

causes the Wind to stand still, and, thus a combined pre-mixer and air-diffusion control for the purpose of introducing cooled or heated air into the theatre without discomfort to anyone.


As shown in the picture, the Anemostat consists of a series of cones placed within each other in such relationship that the air is discharged in definite proportions, not only radially for a full 360 degrees, but also hemispherically in a series of planes. This discharge creates

multiple counter-currents of room air at low velocity which are siphoned into the diffuser and therein mixed with the incoming air stream. In this way 30 per cent of the theatre air is pre-mixed with 70 per cent of the incoming cooled or heated air before the total volume of 100 per cent is discharged into the theatre. This pre-mixing and diffusion produces a prompt and satisfactory equalization of temperature and humidity both vertically and horizontally throughout the audience. Mixture is so rapid, with both aspiration and diffusion occurring equally close to the device. that a single

CIRCULAR DESIGN of the Anemostat harmonizes pleasantly with the ceiling treat ment used in coniunction with the indirect lighting in the auditorium of the Trans-Lux (52nd Street) Theatre, New York. All pictures used in this article are through the courtesy of the equipment maker, Anemostat Corporation at America.
1945 Theatre Catalog, 4th Edition, Page 397