MICROSCOPIC MOTION PHOTOGRAPHY 107 



power lenses, and for picture work, a greater depth 

 of focus. I am able, for example, to get all levels of 

 a pollen grain sharp when the image is % of an inch 

 long in the camera, showing the nucleus, a yard long 

 on the screen. 



This tandem device also allows me to use a dark 

 field illuminator, which I designed and made, that 

 passes much more light than any other on the mar- 

 ket. It was figured for a 16 mm. or lower power lens 

 and is so easy to use I can prepare my slide, walk 

 from the bench to the microscope, put it on the 

 stage, and start the camera with a magnification of 

 up to 1,800 times, in twenty seconds quite an ob- 

 ject when working with a subject that does not live 

 long, or its action about to begin. 



Most workers laugh at the tandem microscope. 

 They do so without having tried it, and I am not 

 selling it, or the idea, only getting results. I am not 

 troubled by their smiles. One of the Eastman re- 

 search men said it was all wrong that two and two 

 made four, and there was nothing gained, but one 

 of the younger men in the same department said, 

 "Yes, two and two make four, but three and one do 

 also, and perhaps that method will give a better pic- 

 ture." 



Any microscopic unit must be mechanically ac- 

 curate and solid; each element slides on its own car- 



