Smithsonian Report, 1939. — F. A. Brooks 



Plate 3 



1. SiNGLE-PiPE Solar-Energy Absorber for Small Installations. 



A black background and proper length of box as seen in fig. 2 (below ) are recommended instead of the e.xperi- 

 mental reflector-bottom shown in this photograph. 



Multiple-Pipe Solar-Energy Absorber. Showing Branch-T Method of 

 Connecting Parallel pipes. 



