Compensating Oculars. 



In subsequent orders for ocular 4* the factory number of the stand with 

 which it is to be used should be stated. 



When ordering oculars for stands of other makers it is necessary to send 

 us an exact impression in sealing wax of the tube edge or, better still, to send 

 the tube in question to our works. 



Compensating oculars for the English tube. Beside those enum- 

 erated above the following compensating oculars are made to order for the 

 10-inch tube. 



2 e : Equivalent focal length: 135mm, Price: Mks. 25. . Code-word: Pajarete. 

 -I": 67 25.. Pajarico. 



Se : 34 35.. Pajarillo. 



The compensating oculars for the continental tube may also be used on 

 the 10-inch tube, but in order to obtain correct ocular magnification for a tube- 

 length of 250 mm (about 10 in.) it is necessary to multiply the figures engraved 

 on the oculars by 1.5. 



Table of Magnifications of the Apochromatic Objectives 

 with the Compensating Oculars. 



Calculated for 160 mm (about 6 1 /., in.) tube-length and an image distance 



of 250 mm (about 1O in.). 



In employing nose-piece or sliding objective-changer, the length of the nose-piece amounting to 

 15 mm, that of the sliding objective-changer to 22 mm. must be taken into account (see p. 8). 



Qazt Sxbs, Stana. 



