408 



Intelligence and Miscellaneous Articles. 



plate glass or other semi-transparent surface, through which the 

 shadow of the person may pass ; and at the hack of such screen I 

 have a frame capable of being set nearer to or further from the back 

 of the screen, and in this frame I have a white surface capable of re- 

 ceiving the shadow so passed through the semi-transparent screen, 

 and by causing such white surface to come nearer to or further from 

 the screen, I obtain varying effects of light and shade in the picture 

 produced. And I find it of advantage sometimes to use a brown, 

 blue, or black back surface, particularly when taking images of plaster 

 busts or other white objects ; for it will be evident that although I 

 have thus far confined the description to the taking likenesses from 

 human beings, any other object having the apparatus placed suitably 

 in front of it, will be received on the reflector, and reflected to the 

 prepared surface, in like manner to that of a person. And I would 

 also remark, that in using a large concave reflector to collect the 

 light as above explained, I find it desirable to stretch across the front 

 thereof/ a surface of tissue paper varnished with boiled oil, such as 

 is used for tracing paper, as it has the effect of scattering the light 

 and producing a better effect in the picture. 



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Repertory of Patent Inventions, N.S., vol. xv. p. 13. 



