16 



For use with this objective we make deep glass cells, cemented on slides. 



Price: Mk. 3.50. Code-word: Pajarita. 



Compensating eye-pieces, when used with achromatic objectives, should only 

 be employed with those of large aperture, such as the DD 0.85 and up- 

 wards. 



All these objectives are also supplied adjusted for the English 

 10-inch body (tube length = 250 mm [about 10-in.]). 



Special mahogany cases for objectives and eye -pieces, with 

 locks. 



Price according to size from Mk, 75. to jo. . 



Fig-. 7. 

 Mahogany case for objectives and eye-pieces. 



