232 



PHOTOGRAPHIC ENLARGEMENTS 



[CH. VII 



358. Negative record in photography. 



Name No. 



Location 



PROJECTION APPARATUS FOR PHOTOGRAPHIC ENLARGEMENTS 

 359. Enlarged prints of small negatives. There is great 

 advantage in making pictures of large objects at a considerable 

 distance with a long-focus objective, so that the perspective will be 

 correct and all levels of the object be in good focus. It is also ad- 

 vantageous to make pictures of microscopic objects without undue 

 enlargement; then there is greater sharpness of the object as a whole. 

 If now one wishes a large print, any good negative can be used 

 and a print obtained of almost any desired enlargement by using a 

 photographic objective for projecting the image upon the photographic 

 paper. This is done with projection apparatus in a dark room as 

 follows: The management of the projection apparatus is as for draw- 

 ing. The negative is placed in some kind of a holder and put in the 

 cone of light of the main condenser where the part of it to be enlarged 

 is fully illuminated. An erect image will be printed on the paper 

 if the film side of the negative faces the paper exactly as for contact 

 printing. Of course if it is desired to reverse the position it can be 

 done by turning the film side toward the source of light. 



