498 



Journal of Applied Microscopy. 



ONE-THIRD INCH OBJECTIVE. 



ONE-SIXTH INCH OBJECTIVE. 



6.2 

 5.6 

 5.6 

 5.0 

 5.2 

 7.6 

 6.0 

 6.2 

 6.4 

 6.0 



3.6 



3.4 

 3.6 

 3.0 

 3.2 

 3.4 

 3.6 

 3.6 

 3.0 

 2.6 



2.2 

 2.2 

 2.0 

 2.0 

 2.2 

 2.6 

 3.0 

 3.0 

 3.2 

 3.6 



4.3 



2.4 



1.7 



SUMMARY. 



COMBINATION. 



FOCAL DEPTH. 



1 inch — A. 

 1 inch— B. 

 1 inch— C. 

 1-2 inch— A. 

 1-2 inch— B. 

 1-2 inch— C. 

 l.,S inch— A. 

 1-3 inch— B. 

 1-3 inch — C. 

 1-4 inch — A. 

 1-4 inch— B. 

 1-4 inch— C. 

 1-6 inch — A. 

 1-6 inch— B. 

 1-6 inch — C. 

 3 Leitz — A. 

 3 Leitz— B. 

 3 Leitz— C. 



0.0210 inch. 

 0.0130 inch. 

 0.0090 inch. 

 0.0036 inch. 

 0.00,S2 inch. 

 0.0023 inch. 

 0.0028 inch. 

 0.0016 inch. 

 0.0012 incli. 

 0.0021 inch. 

 0.0012 inch. 

 0.0008 inch. 

 0.0010 inch. 

 0.0000 inch. 

 00005 inch. 

 0.0010 inch. 

 0.0018 inch. 

 0.0025 inch. 



