SALES IN NOEX FIGURES 250 200 150 <00 19S0 *61 *52 *63 SCI 01937

n )" ; L.

preliminary rrocram i- _ Y>im,*\ 1~j+z"Nj,j Lr.

Air System Equipment Air Diffusers Universal Diffuser Corp. 890 Whittier St., New York 59, N.

y-- Heating Systems 4ItM<Ssur"ces -- -- Crane Co.

Heating Systems Bdier Feeders McDonnell & Miller, Inc.

crele Insulation Conduit and Underground Division Zonolite Company 135 S.

An Conditioning Carrier Corporation Syracuse 1, N.

Stainless Steel.

Air System Equipment Air Vent.

C.

84 Coefficients for these taps have been adopted by the International Standards Association, but are not used commercially in America.

1134 CHAPTER 52 D tl it 0.00009 When a thermometer is used in a liquid or in air or gas near room tem perature, the effects of radiation can often be ignored, but when the tem- : perature of hot air or gas is desired, means are usually provided for mini'mizing the effect of radiation.7 These include bright metallic shields ~ around the thermometer bulb, and the use of aspirated thermometers in which a stream of the air or gas is drawn at considerable speed across the bulb and increases the influence of the gas temperature on the thermom eter indication. ' In any case, to prevent errors in temperature measure ments, there should be ample circulation so that the thermometer will indicate a true temperature of the medium under observation, and ample time should be allowed for the thermometer to reach the same temperature as the medium.

Controls and Instruments Barber-Colman Company Automatic Temperature Controls Rockford, Illinois THERMOSTATS OUTDOOR RESET CONTROLS Single and two-stage room and remote bulb thermostats for on-off control; room and remote bulb thermostats for proportioning control.

P. 0.