826 



SUMMABY OF CUKRENT RESEARCHES RELATING TO 



referred to tlie figure of the appliance given in the Journ. Quek. Micr. 

 Club, vi. (1880) pi. xii. Certain modifications have been suggested * 

 which add to its efiiciency, and which we here describe with reference 

 to Fig. 188. These modifications are four in number. (1) The appli- 

 cation of metal jaws for clamping the swinging bar to the stage at 



I 



Fia. 188. 



pleasure, instead of the permanent fitting in one position by screws. 

 (2) The sliding movement on the arm H, instead of a fixed arm carry- 

 ing the condenser. (3) Similar sliding movement to the mirror. (4) 

 The rackwork is carried much higher up the bar for greater convenience 

 of focussing the illumination with a condenser of short focal length. 



A is a part of an ordinary fixed stage of a Microscope. B, metal 

 jaws clamping upon the edge of A by means of the milled head shown 

 above ; the fitting of these jaws is so arranged that the axis at the 

 back, on which the whole bar C swings laterally, is (approximately) 



* Eng. Mccb., xxxii. (1881) p. 582. 



