IEPORT OF SOUND ABSORPTION TEST A 53-2*2 ON BESTOALL LIGHT ACOUSTICAL PLASTER FOR BESTT'ALL GYPSUM COMPANY February 18, 1958 submitted by Riverbank Acoustical Laboratories Ge ne va, Illinois ARMOUR RESEARCH FOUNDATION OP ILLINOIS INSTITUTE OF TECHNOLOGY SGP 0019706 I REPORT OF SOUND ABSORPTION TEST A 58-1*2 ON BESTRAIL LIGHT ACOUSTICAL PLASTER FOR BESTWALL GYPSUM COMPANY February 18, 1958 INTRODUCTION The method used in making these measurements meets the requirements of the American Society for Testing Materials* Proposed Method of Test For Sound Absorption of Acoustical Materials in Reverberation Rooms.

BEST WALL CERTAIN-TEED SALES CORPORATION GYPSUM PRODUCTS MANUAL 1 9 $ 9 EDITION NOTE This Manual No

&E5TWALL Bu*1oNg prod ods F'.RESTOF 6ESTWALL GYPSUM WALLBOARD ONE HOUR N0N-10AD BEARING STUDLESS WALL REPRODUCTION FROM UNDERWRITERS' LABORATORIES, INC.

Jackson Salat Hr* G, V.

154 CHAPTER 8 1950 Guide of organic substances such as tobacco, wood, coal, oil, tar and other carbonaceous materials.

442 CHAPTER 19 1950 Guide ..REFERENCES ,. > Specifications for the furnace unit and the installed duct system are shown in The Yardstick, Manual' 8, and Manual 7 published by National Warm Air Heating and Air Conditioning Association. * Performance of a Forced.Warm-Air Heating System as Affected by Changes in Volume and Temperature of' Air Recirculated, by A.

638 CHAPTER 30 1950 Guide -o*- Winter convection current Fig. 9.

724 CHAPTER 34 1950 Guide of small drops over the filling and across the air stream with less resistance to air flow..

On pages 1059-1410 will be found the Catalog Data of 253 manufacturers whose products are described and illustrated.

128 CHAPTER 6 1951 Guide EFFECTIVE TEMPERATURE INDEX AND COMFORT ZONES , There is no precise physiologic observation by which comfort can be evaluated.

220 CHAPTER 10 1951 Guide Infiltration and Air for Combustion Infiltration in buildings normally supplies the air required for combus tion by fuel-burning appliances, but in some cases weatherstripping, sealing and calking may reduce infiltration to the point that special open ings must be provided to supply adequate air to the heating appliances.

466 CHAPTER 20 1951 Guide when the boiler is steaming under pressure conditions which would prevent the return of condensate by gravity.

566 CHAPTER 25 1951 Guide condensate from the cooling coil is sprayed over the condenser. surface and vaporized, thus eliminating the need for drain connections.

786 CHAPTER 36 1951 Guide between the vapor in the cylinder and the cylinder wall, and also because of intentional heat dissipation from the outside of the cylinder walls to the surroundings, or to a cooling fluid passing through a water jacket around the cylinder.

818 CHAPTER 37 1951 Guide ABSORBENTS Any absorbent substance may be used as a dehumidifying agent if it has a vapor pressure with respect to water lower than the partial pressure of the water vapor in the mixture from which the moisture is to be removed.