Chap. XXVIII.] ^flCRO-PHOTOGRAPHY. 373 



point of the pencil we can follow the lines of the 

 image on the paper. 



The raetitral tint reflector of Dr. Beale is one 

 of the simplest and least expensive of all aids to draw- 

 ing. It consists simply of a circle of tinted glass set on 

 a ring at an angle of 45. By means of the ring it is 

 slipped on the eye-piece. The microscope is hori- 

 zontal, and the eye placed above the eye-piece looks 

 straight down through the reflector. The rays from 

 the microscope falling on the glass are reflected upwards 

 into the eye, and at the same time light from a paper 

 below can pass through the glass and fall on the eye, 

 so that the coincidence of the image and the point of 

 the pencil on the paper can be obtained. The glass 

 is of neutral tint, to diminish the glare from the paper, 

 which would interfere with the distinctness of the 



image. 



MICRO-PHOTOGRAPHY. 



Photographs of objects, as magnified by a micro- 

 scope, may be taken in various ways, which ought to 

 receive mention in this place. The ordinary com- 

 pound microscope may be used, the mirror having a 

 condensing arrangement bevoiid it for concentrating 



*/ C3 



the light on the object. Instead of the eye-piece a 

 dark slide is fitted to the tube of the microscope, so 

 that the image is focussed on the plate which it con- 

 tains. The plate is one of the usual sensitive plates, 

 and after exposure and development a photograph of 

 the object will be obtained. In this case the image 

 is not very large. 



A very simple arrangement permits the ordinary 

 photographic camera to be used with the microscope. 

 The lens of the camera is unscrewed, and, the eye- 

 piece of the microscope being removed, the microscope 

 tube, placed horizontally, is closely fitted into the 

 opening in front of the camera. The camera should 



