BROWNINGS ROTATING MICROSCOPE. 



21 



cally by means of rack and pinion ; but the cheaper kinds 

 are usually provided with a removable tube, into which the 

 polariscope, condenser, and other accessories are made to 

 fit. These should be capable of taking accessories made 

 to the one and a half inch gauge, even if purchased from 

 different makers. 



A cheap but well-made microscope of special pattern has 

 been devised by Mr. Browning, in which the entire body 

 and stage rotates upon the same axis, perfectly concen- 

 tric even with the highest 

 powers. It has a large 

 circular glass stage, re- 

 movable stage -fitting for 

 apparatus, and is a very 

 good form for laboratory 

 or general use. It is made 

 both with monocular and 

 binocular bodies, the for- 

 mer of which is shown in 

 Fig. II. 



A very good form of 

 portable microscope is 

 made by Mr. Browning 

 and shown in Figs. 12 and 

 13. The stage is fitted 

 with rectangular and cir- 

 cular motions, has an ad- 

 justable substage with cen- 

 tering movements, and is 

 fitted with plane and concave mirrors on jointed arm. 

 When fitted up for use it is as steady as a stand of the 

 ordinary make, as the author can testify, and is shown in 

 this position in Fig. 12. By a novel arrangement the body 

 of the microscope turns on a joint and packs away with- 



FlG. II. 



