74 SCIOPTICON MANUAL. 



4. The apparatus may stand within reach of the 

 operator. 



5. It requires no previous preparation more than 

 having clean glass, and chemicals in good working 

 order. 



6. The albumen coating is not required to make the 

 film adhere. 



7. The amount of exposure can be definitely gauged. 



8. The illumination is confined to a narrow cone, so 

 as not to fog the picture by diffused light. 



9. The exposure is so immediate and uniform as to 

 escape many accidents. 



10. It is so easily done, that many causes of failure 

 involved in a long process are not encountered. 



11. The negative is not marred by use as in contact- 

 printing. 



12. This apparatus complete costs but seven dollars. 



Thus we have in it advantages by the dozen. 



THE SCIOPTICON PROCESS. 



By placing the Sciopticon near a wall, in a dark room, 

 and drawing forward its extension front, an image of a 

 negative may be projected into a three-inch circle. First 

 focus sharply on a paper-covered glass, and then expose 

 a wet plate in the same place a minute, more or less, 

 developing and fixing as usual, and we have a glass posi- 

 tive photographed by the Sciopticon for the Sciopticon. 



The objective is always used with full opening, because 

 all the light is needed, and because it will not give an 

 evenly illuminated disk with a small stop; so we cannot 

 secure perfect sharpness to the very edges. It answers 

 well, however, for central figures, and the photographer 

 can easily produce unexceptionable positives from his 



