Apparatus for Photomicrography. By D. de Orueta. 589 



to be moved nearer or farther from the Microscope without moving 

 the camera base. 



The collar C is supported on a vertical bar, by means of which 

 the bar B and the photographic camera can be raised or lowered 

 together. 



_ The nut T is used to turn the other nut T', and to prevent the 

 height of the apparatus changing when it turns round the column 

 C. Both screws are moved by a key A. 



The amplitude of this vertical movement is 75 mm. (3 in.), and 

 serves to adapt the camera to the Microscope, at the inclination 

 given to the latter. 



The camera, the bar B, and the nuts T and T' are carried on a 



Fig. 70. 



vertical column G rising from a cast-iron base M. The base M is 

 provided with two levelling screws S and a pivot S'. The ends of 

 these screws project into a groove made in the base -piece p, and 

 they can run inside it moving the column and the camera parallel 

 to the axis of the Microscope. The amplitude of this movement is 

 37 mm. (1£ in.), and by the combination of this movement and the 

 vertical movement already mentioned, the camera can be rapidly 

 adjusted to differences in the tube-length of the Microscope. 



The important feature of the apparatus is a reflection prism P, 

 which fits over or replaces the eye-piece and can be easily changed. 

 This prism reflects the light rays at right angles to the axis of the 

 Microscope, and is provided with a cylindrical cover which enters 

 a tubular collar of similar diameter on the front of the camera, 

 forming a liwht-ticdrt connexion. 



Oct. 18th, 1911 



2 Q 



