.:;i 



SUMMARY OF i URRENT RESEARCHES RELATING TO 



external appearance of the Metal-Microscope is shown in fig. 55. A 

 strong handle-shaped pillar for convenieni transport of the instrument 

 rises out of the stout c-jist-iron base-plate. This pillar carries the rack- 

 and-pinion coarse-adjustment of the stage; it also carries the universal 

 mirror. The fine-adjustment is similar to that adopted in Reickert's 

 stands A i. and A ii. The Microscope-stage can he centred and is rotatory. 



Fig. 56. 



It has two lateral position-screws, which permit a movement of several 

 millimetres ; larger movements must be done free-hand, or with the 

 Bliding-stage (fig. 56). The camera (fig. 56) is on heavy metal feet, 

 and moves on an optical bench. The tube of the Microscope is applied 

 to the camera with light-tight connexion. Movement of the eye-lens of 

 the projection ocular throws a sharp image on the matt-glass screen of 

 the camera without requiring any alteration in the instrument as ar- 



^ 



«*** 



V 



M 



Fig. 57. 



ranged for visual observation. It may, however, be necessary, especially 

 in the use of filters, to perfect the image by the camera fine-adjustment 

 — this is done by a Hook key. 



New Mirror Reflex-camera. — In order to enable the operator to 

 control the photographic image without rising from his seat, this 

 camera (fig. 57) has been contrived. It has the matt-glass M parallel 

 to the camera-axis, the shutter-box K in the usual place. Between them 

 is a vertical mirror Sp, worked from outside by a knob, and rotatory 



