CA.B1_E: a D D F=iE s s 'Wo l_ L. E fsl S ^ ’’ 
Executive Offices and Works 
June S4, 1932 
■’.'ysldo L. Schmitt, 
Carnegie Marine Laboratory, 
Dry Tortugas, Fla. 
via Key IVest. 
Dear Sir: 
Rfenlying to yours of the ISth, nlease find 
attached herewith a table showing how many times one 
lens is faster than the other. 
Use this table as a guide in making ycu.r 
exoosures and we are confident the results will be 
quite satisfactory. 
Very trul^yddrs. 
170LLEN, 
CAL COl£PANy 
JGM : C 
. r 
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