112 CHAPTER 6 1952 Guide upon a number of factors, including the dietary and hygienic habits of the occupants (frequently reflecting their socio-economic status), the outdoor air supply, air space allowed per person, odor adsorbing capacity of air conditioning processes, and temperature and relative humidity.

142 CHAPTER 7 1952 Guide providing a uniform environmental temperature just sufficiently high to keep the body temperature within normal limits.

374 CHAPTER 14 1952 Guide Automatic Fuel Burning Equipment 375 GROSS OUTPUT - HONORED FEET WATER.

470 CHAPTER 20 1952 Guide the rise in the water level at the far end of the return, due to the difference in steam pressure, would be 1 of 28 in. (28 in. head being equal to one pound per square inch), or 3J in. - Adding 3 in. to overcome the resistance of the return main, and 6 in. as a factor of safety for heating up, gives 12J in. as the distance'the bottom of the lowest part of the steam main and all heating units must be above'the boiler water line.

1062 CHAPTER SO . 1952 Guide Table 1.

656 CHAPTER 30 1953 Guide ^ tion.

676 CHAPTER 31 1953 Guide / 1.

.766 CHAPTER 35 1953 Guide . ./ the water upwards into the air.

850 CHAPTER 38 1953 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.

'900 CHAPTER. 41 . ,.1953 Guide Sound Control Fig. 6.

1032 CHAPTER 48 : 1953 Guide from the:air ,by. mechanical separation; finer materials, by, electrostatic action: - -- -i - - - .

1034 CHAPTER 48 1953 Guide PASSENGER BUS AIR CONDITIONING The passenger bus designed for urban transportation operation presents a greater problem to the designer of heating systems than does the interurban bus.

1044 CHAPTER 48 1953 Guide Report on Relative Performance of Air Filters, by Mechanical Division, Association of American Rail roads, January 16. 1038.

% * INDUSTRIAL HYGIENE FOUNDATION OF AMERICA, INC.

^ial Hygiene Digest April, 1957 36/i of the controls.