PHOTOGRAPHY AND PHOTOMICROGRAPHY. 



133 



shown in fig. 24 may be nsed for this purpose. To avoid shadows the mirror should 

 be held some distance above tlie object when the surface is not even. The first five of 

 the Zeiss series of Planars are all that are usually required. No. i gives the highest 



Fig. 123.* 



*FiG. 123. — Simple apparatus for holding the camera in place when one wishes to photograph 

 down. The camera here shown is a Rochester Optical Company, reversible back 5 by 8, fitted with 

 a Bausch & Lomb rapid universal lens, and has been used very often by the writer for natural-size 

 work and for lantern slides. 



