March 8, 1947 .Ur.

INDUSTRIAL HYGIENE FOUNDATION OF AM ERI CA, I N C.

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Off the Editor's Chest' (Continued, from page 24) ay be a good idea to make an tra carbon of your first letter, "follow up" purposes, to be |ed just in case the manufacturer *es fail to acknowledge or reond to your complaint.

HEATINC VENTILATING AIR CONDITIONING CUIDE 1941 grille and the average level in the room, leaving an effective level of 65 db in the room.

HEATINC VENTILATING AIR CONDITIONING GUIDE 1942 design becomes a less critical matter.

HEATING VENTILATING AIR CONDITIONING GUIDE 1942 The lower limit of si2e of particle visible to the naked eye cannot be stated definitely.

HEATING VENTILATINC AIR CONDITIONING GUIDE 1942 (3) Manual contactor or reduced voltage compensator with overload and low voltage release. (4) Drum switch equipped with latch coil to give low voltage release. 2.

HEATING VENTILATING AIR CONDITIONING CUIDE 1942 surrounding air temperature conditions.

OIL BURNERS, Rotary Todd Combustion Equipment, Inc., 1062 OIL BURNERS, Steam Atomiz ing Todd Combustion Equipment, Inc.. 1062 Webster Engineering Co., 1061 OIL BURNERS, Variable Capa city PIPE, Copper American Brass Company, 10881089 American Radiator 8c Standard Sanitary Corp.. 1040-1041 Crane Company, 1044-1045 Wolverine Tube Company, 1090 PLASTER BASE, Fire Retarding Armstrong Cork Company, 1093 Celotex Corporation, 1095 Johns-Manville, 1102-1103 Reynolds Metals Co., Inc.. 1109 United States Gypsum Co., 1112- 1113 PIPE, Copper Bearing Steel PLASTER BASE, Insuiative Bethlehem Steel Co.. 983 Crane Company. 1044-1045 Jones & Laughlin Steel Corp.. 984 Armstrong Cork Company. 1093 Celotex Corporation, 1095 lnsulite Company, The. lUXMXOl Johns-Manville, 1102-1103.

HEATINC VENTILATING AIR CONDITIONING GUIDE 1942 GRIBBON, J.

HEATING VENTILATINC -AIR CONDITIONING GUIDE 1943 Pressure (continued) velocity, 850 water supply piping,'821 -Prime surface, 848 (see Heating surface) ; Propeller fan, 537 Properties of saturated steam, 24 Psychrometer, 848 Psychrometric chart, 60 Pulverized coal. 180 Pump, pumps condensation return, 281 mechanical circulators, 312 vacuum heating, 282 controls, 283 piston displacement. 285 Pyrometer, 671 optical, 671 radiation, 671 Q-R Radial flow fan, 575 Radiant drying, 800 Radiant heating, 803 ", application methods, 807 calculation principles, 808 detailed computation method, 811 drying methods, 747- electric. 808 hot water, 807 measurement of. 815' steam, 807 ..

HEATING VENTILATING AIR CONDITIONING GUIDE 1943 heat transfer performance on logarithmic coordinates, and the factor B should be regarded as a simple constant of proportionality.

HEATINC VENTILATING AIR CONDITIONING GUIDE 1943 tion, together with the reduced heat losses up the chimney by reason of decreased gas velocity, results in fuel economy, with consequent lower costs of plant operation.