298 Mr. B. S. Proctor on the Focal Adjustment of the Eye. 



Table of Resolving Powers. 





Vertical. 



Horizontal. 



Note. 



B. S.P. D 



9 inches. 



6^ inches. 





Right eye. 



15 



4* 



The numbers given as 



Left eye. 



10 



4i 



the resolving power 



Both eyes. 



15 



H 



indicate the thou- 



T. P. B. D 



Right eye. 

 Left eye. 

 Both eyes. 



24 inches. 

 25 

 25 

 25 



9^ inches. 

 5 

 5 

 5 



sandths of an inch 

 width of dark space 

 between two lumi- 

 nous lines at the 

 point where they ap- 



F. S. D 



4£ inches. 



4^ inches. 



proach so closely that 



Right eye. 



5 



5 



the separating space 



Tieft eye. 



3 



4 



just ceases to be dis- 



Both eyes. 





4 



tinguishable. 



J. D. D 



Right eye. 

 Left eye. 

 Both eyes. 



8 inches. 

 5 

 5 

 5 



8 inches. 

 41 

 5 



4i 



The distance (D) in 

 each case is the 

 shortest convenient 

 focus. 



C. B. D 



lif inches. 



Hi inches. 





Right eye. 



5 



4 





Left eye. 



5 



4 





Both eyes. 



5 



H 





M. J. P. D 



8 inches. 



8 inches. 





Right eye. 



n 



3 





Left eye. 



5 



3 





Both eyes. 



5 



3 





F. R. D 



6 inches. 



6 inches. 





Right eye. 



6* 



n 





Left eye. 



61 



8 





Both eyes. 



61 



5* 





W. W. P. D 



6 inches. 



6 inches. 





Right eye. 



5 



4i 





Left eye. 



4* 



5 





Both eyes. 



H 



4£ 





m. s. :d 



9| inches. 



9| inches. 





Right eye. 



m 



10 





Left eye. 



10 



10 





Both eyes. 



10 



10 





