372 CHAPTER 19 1946 Guide than 12 in.

560._________________ _________ CHAPTER 31________ / 1946 Cuide When two plane surfaces of infinite size are parallel to each other and their surfaces are at different temperatures, the exchange of heat between the two is proportional to the difference between the fourth powers of their absolute temperatures.

756 CHAPTER 41 1946 Guide Film conductance /0 depends on a number of variables including tem perature, diameter, and emissivity of the outer surface and can be calcu lated from data in Chapter 5.

918 '1946.

ti' k* r A. 1^ 'X-.. 90 .'

r--. : ;`;.

18 _________________ ____________ i.

m 6 h 464 CHAPTER 24 1948 Guide difference of 20 deg; if the temperature difference were 40 deg,-the heat conveyed would be twice that, shown in the chart.

700 .

844 _____________ CHAPTER 47_________ ________________ 1948 Guide: -period of drying, the temperature of the material approximates the wet bulb temperature of the air.

206 CHAPTER 11 1949 Guide The hair hygrometer consists of from one to several strands of hair with a mechanism whereby changes in length of the strands, due to changes in humidity, cause an indicator to move across a dial.

214 CHAPTER 12 1949 Guide 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.

418 CHAPTER 20 1949 Guide heat gains, such as sun effect, and niany others.

616 CHAPTER 31 1949 Guide where to = 0.81 u, + 0.135 [VV (a - (Vv - 1.40) <.], to = operative temperature, Fahrenheit degrees. to = mean radiant temperature, Fahrenheit degrees. 1a -- air temperature, Fahrenheit degrees. 1. = mean skin temperature, Fahrenheit degrees.

894 CHAPTER 45 : 1949 Guide Air Conditioning in the Bakery, by W.