168 CHAPTER 9 1956 Guide e = emissivity; the ratio of the total radiant flux emitted by a surface to that emitted by an ideal black body at the same temperature.

436 CHAPTER 17 1956 Guide greater in the horizontal passages in the heating plant, the breeching, and the smokepipe, than in the vertical chimney liner.

584 CHAPTER 24 1956 Guide temperature drop is used in determining water flow rates, and a total pump head of more than 30 ft is undesirable due to noise caused by high water velocity.

686 CHAPTER 30 1956 Guide and humidity.

842 CHAPTER 36 1956 Guide U = overall coefficient of heat transfer, Btu per (hour) (square foot of external coil surface) (Fahrenheit degree temperature difference between the fluid within the coil and the air flowing over the coil).

872 CHAPTER 37 1956 Guide designed to operate with reasonable efficiency at capacities as low as 20 per cent of normal load.

1016 CHAPTER 45 1956 Guide Table 1.

1096 CHAPTER 48 1956 Guide lack of adequate insulation in car bodies require this much capacity.

1134 CHAPTER 50 1956 Guide climates, however, where air conditioning is the primary consideration, the summer air-flow rate may be used the year around.

Central and Self Contained Air .

Air System Eqquipment rSjmo1?

R ESEAR C H A S S O C IA TIO N 3 4 4 0 P ru d e n tia l P laza, C h ica g o 1.

J-M Manufacturing Company, Inc. fo R, D.

Silvercote Products, Inc. 161 East Erie Street, Chicago, 111.

128 CHAPTER 6 Upon leaving an air-cooled space and re-entering a hot atmosphere,: , sudden warming occurs.