224 THE BOOK OF THE LANTERN. 



over the face of the easel, which serves as a focussing 

 board, the frame shuts it in and is clamped. In this way 



FIG. 56. 



the paper is heM tight without the necessity of using pins, 

 or other loose fastenings. 



Fig. 57 shows a larger view of this box, with its supply 

 of sensitive material. But the beginner would no doubt, 

 first of all, experiment with a simple board, and one 

 measuring 12 inches by 10 inches would be ample. 



The sensitive surface to be employed when a direct 

 positive is required, is paper specially prepared with a 



