Page View
True, Webster Prentiss / The Smithsonian Institution
(1938)
Chapter V: Measuring life-giving sun rays, pp. 62-78
Page 62
![[page image]](http://images.library.wisc.edu/HistSciTech/EFacs/SmithsnSciSer/SmInstTrue/M/0108.jpg)
Copyright 1929 by Smithsonian Institution Series, Inc.| For information on re-use, see: http://digital.library.wisc.edu/1711.dl/Copyright




