io6 PICTURING MIRACLES 



riages, sliding back and forth on the same track and 

 so arranged that both may be raised or lowered in 

 very small fractions of an inch, and moved in contact 

 with a light trap device on the camera instantly. The 

 microscope should have a viewing prism between the 

 eye piece and the camera, so the image may be 

 watched all the time, if necessary. 



There should be an auxiliary shutter synchronized 

 with the camera shutter between the light and the 

 microscope, keeping the subject in the dark except 

 at the instant of exposure. 



The entire unit, microscope, light, camera, car- 

 riages, and track should be hinged solidly, allowing 

 it to be tilted up for liquid subjects, although the 

 horizontal position is more convenient for most 

 work. 



Spotlights or reflecting prisms in the microscope 

 are necessary for top lighting of opaque subjects and 

 cooling chambers for all forms of lighting; a com- 

 plete set of lenses from oil immersion to at least 

 50 mm. and eye pieces and condensers. These should 

 be of the best make and kept perfectly clean. 



Each one has his own method of accomplishing 

 the desired result. I, of course, am no exception. I 

 have developed a tandem microscope that has many 

 advantages; one of the greatest is, I am able to get 

 the required magnification in the camera, with low 



