176 ILLINOIS ACADEMY OF SCIENCE 



equations for a bent as a whole as there are unknowns and 

 the unknowns can be determined. 



V. CONCLUSIONS 



The number of equations involved in the slope-deflection 

 method is so great that the method can not be used 

 in designing buildings. The method, however, was used 

 by the writer and Mr. Maney to determine the stresses 

 in a number of typical bents, after which the stresses were 

 also determined in the same bents by the four approximate 

 methods described above. As a result of these calculations 

 it was found that for bents for which all columns of a story 

 have the same section Method I and Method IV are accurate 

 enough for the purpose of design. 



HEAT TRANSMISSION OF SIMPLE AND COM- 

 POUND WALLS, WITH SPECIAL REFERENCE 

 TO BUILDING CONSTRUCTION 



ABSTRACT 



Arthur C. Willard, University of Illinois 



1. Consideration of the theory involved in the transmis- 

 sion of heat through a wall, and the relation between radiation, 

 convection and conduction as involved in the process. 



2. The effect of air movement on the film of air in contact 

 with the surface of the wall, and the difference between the air 

 and surface temperatures. 



3. Determination of coefficients of transmission, based 

 on inside and outside air temperatures. 



1. The transmission of heat through a simple or compound 

 wall, such as may be used in practice for the exterior walls of 

 buildings, is a phenomenon of very general and practical in- 

 terest. The calculation of the amount of heat transmitted in 

 this way becomes one of the determining factors in propor- 

 tioning any sort of heating or refrigerating system, and also 

 serves as a ready means of comparing the relative heat insu- 

 lating efficiencies of any form of standard wall construction. 



