ULTRAVIOLET MICKOSCOPY 



I 



Fig. 2. The RCA "Ultrascope" image-converter tube used as an ultraviolet viewer and pre-focusing 

 device for photography in the Bausch & Lomb Ultraviolet Photomicroscope. 



limited to a very small number of research 

 organizations. 



In 1959, RCA introduced an ultraviolet 

 image converter tube, which greatly simpli- 

 fied the technique and equipment needed 

 to see an ultraviolet image. The tube called 

 an "Ultrascope", employs a photoemissive 

 cathode, a single-stage electron imaging 

 system, and a fluorescent screen to convert 

 the ultraviolet image into a light image. 

 The double conversion is thus ultraviolet to 

 electrons to visible. 



Figure 2 shows the manner in which this 

 converter tube is mounted on an ultraviolet 

 microscope. A small removable mirror de- 

 flects the ultraviolet image to the Ultrascope 

 tube, or when withdrawn permits photog- 

 raphy of the image, as seen and focused by 

 the Ultrascope tube. This equipment repre- 

 sents a tremendous simplification over 

 previous ultraviolet viewing systems, and 



gives promise of creating new and expanding 

 interest in this field of research. 



REFERENCES 



1. Zeit. f. Wiss. Mickros., 21, 129, 273 (1904). 



2. Skand. Arch. Physiol., 73 (1936). 



3. Nature, 143, 602 (1939). 



4. Bull. Basic Sci. Res., 5, 46 (1933). 



5. J. Opt. Sac. Am., 29, 53.5 (1939). 



6. J. Opt. Soc. Am., 38, 689 (1948). 



7. Bull. Acad. Sci., USSR, 6, 32 (1942). 



8. Proc. Phys. Soc. {London), 59, 41 (1947). 



9. /. Opt. Soc. Am., 39, 719, 723 (1949). 



J. R. Benford 



COLOR TRANSLATING TV ULTRAVIOLET 

 MICROSCOPE 



Aim of the New Design. The electronic 

 color translating TV ultraviolet microscope, 

 designed by scientists of Neutronics Re- 

 search Company, is the most recent means 



550 



