t6 Gee and Adamson, Dioptriemeters. 



study of the figures produced is interesting in connection 

 with the geometrical optics of oblique pencils. 



In conclusion, we have to express our thanks to 

 G. Cussons Ltd., The Technical Works, Broughton, 

 Manchester, for the care taken in constructing the 

 dioptriemeter, and to the Principal and Committee of the 

 Manchester School of Technology, for the facilities placed 

 at our disposal. 



