40 



ROBERT M. YERKES AND JOHN B. WATSON 



vantages. It may be used for single, double, or triple solutions, 

 and it is convenient to fill, empt3^ and clean. Any kind or thick- 

 ness of glass may be used as transmitting plates, for the whole 

 may readil}^ be taken apart. 



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Figure 5 — Unit absorption cell for ray filter. The drawings represent a double 

 (two unit) ceil. 



In ^<g. 5 we present construction drawings for a two-unit 

 cell of this type. 



The essential parts of the cell are a solution chamber cut in 

 a 14 X 14 X 2 cm. block of hard rubber; two 14 x 14 x .4 cm. 

 plates of sheet brass; two plates of optical glass 12 x 12 cm.; 

 two rubber stoppers; rubber tubing for gasket; four studs 



