and Laboratory Methods. 



1997 







LABORATORY PHOTOGRAPHY. 



Devoted to Methods and Apparatus for Converting an Object into an Illustration. 



A PHOTO-MICROGRAPHIC DEVICE. 



Mr. Frederic E. Ives, Franklin Institute, Philadelphia, Pa., has kindly sub- 

 mitted a model of his photo-micrographic camera for our examination. The 

 following are the essential features : 



In the construction of this photo-micrographic attachment, four condi- 

 tions were constantly borne in mind, viz., that nothing should interfere in the 

 slightest degree with the comfortable use of the microscope in the usual way; 



Fig. 1. — Camera adapted to Bausch & Lomb B B Microscope. 



that the microscope might be used at any desired inclination or tube-length, and 

 with any convenient source of light ; that the adaptation and removal of the cam- 

 era should occupy very little time, and that the amplification and definition in 

 the photograph should always correspond to that seen in the microscope. 



The camera consists of a box having at the rear end any ordinary form of 



