584 



SUMMARY OF CURRENT RESEARCHES RELATING TO 



one set places the optic axis of the Microscope in line with that of the 

 bench ; the second set allows the instrument to be placed with its optic 

 axis parallel to but to one side of the axis of the bench, a position suitable 

 for the illumination of opaque objects ; while the third set permits the 



=S" 



Fig. 87. 



Fig. 88. 



Fig. 89. 



Microscope to be used at right angles to the optic axis of the bench. 

 When used as an optical lantern the height of the bench (fig. 90) is 

 increased by a supplementary table. A set of rods and curtains is 

 provided to cover the apparatus. A photomicrographic and enlarging 

 camera (fig. 91) on a similar turntable is made of the same height as 

 the Microscope table, so that it can be placed in alignment for photo- 

 micrography. This camera carries a \ plate (8£ in. by G£ in.) with 

 adapters for smaller sizes, and has a variable extension of from about 



T"T "' JJ -*-'-'-»^-'- 



Fig. 90. 



12 in. to 7 ft., the front portion being extended by means of a steel 

 rod which slides in bushed fittings, while the back slides and clamps 

 upon the main bar of the table. The front of the camera is arranged 

 to take a small photographic plate-holder, and a sliding panel in the 



