9O THE A B C OF PHOTO - MICROGRAPHY 



must be found for utilizing whatever may be 

 at our service in that line, usually some form 

 of hand or portable box with tripod. It must 

 be fitted with a focusing screen, and the length 

 of bellows extension cannot be too great. 

 Procure a smooth, flat board about four feet 

 in length by nine inches wide, and nail or 

 screw a strip of wood (say an inch wide by 

 half an inch thick) along both edges of the 

 upper surface for its entire length. A second 

 board, three feet long, three-quarters of an 

 inch thick, and of suitable width to slide 

 smoothly between the guiding strips, must 

 also be provided. To one end of the fixed 

 or platform board another piece of same 

 width and a foot or more long must be at- 

 tached at a right angle, so as to stand perpen- 

 dicularly when the platform rests on a table 

 top. In this board an opening (usually 

 square), the center of which shall exactly co- 

 incide with that of the camera when in posi- 

 tion on the platform, must be cut and two or 

 more spring clips similar to those on stage of 

 microscope attached, for holding in place a 

 glass plate, cardboard, etc., over the opening. 

 Now, if our camera be one of the long focus 

 folding or portable varieties so generally made 

 at the present time, with bellows twenty or 



