and Laboratory Methods. 



1525 



LABORATORY PHOTOGRAPHY. 



Devoted to methods and apparatus for converting an object into an illustration. 



PHOTOMICROGRAPHY. 



II. An Apparatus Adapted to All Kinds of Work. 



The apparatus with which my work in photomicrography is at present clone 

 is in one of the private offices of Dr. C. S. Bond of Richmond, Ind. ; he has not 

 only by his material help made it possible for me to have such an apparatus 

 with which to work, but he has also worked with me from the first ; everything 

 that has been done with this apparatus has been our joint work. 



The essential parts of the apparatus are shown in Fig. 1. It rests on an 

 unshakable stone tioor, and consists of two tables supported on adjustable metal 



Fig. I. — Photomicrograpliic apparatus. 



legs. Their combined length is ten and a half feet. One, four feet long, carries 

 the arc light and illuminating accessories; the other carries the microscope and 

 camera. The microscope stand is the 1899 Zeiss model, expressly made for 

 photomicrography. It is fitted with apochromatic objectives of from 70 mm. to 

 2 mm. and compensating and projecting eyepieces. The fine adjustment screw 

 is controlled by a brass rod, which lies on the bench under the camera and has 

 a pulley and cord attachment (ct) with the milled head of the micrometer screw. 

 The microscope is so supported by an adjustable brass pillar (/;) that this pulley 

 cannot in the least affect it. 



The camera is carried on two nickeled steel tubes (r) which rest on adjustable 

 metal supports. The board Q/) on which the microscope rests is bound also by 

 clamps to these same tubes. Four strong, adjustable brass pillars (e) hold the 

 board firmly at one distance from the table. These arrangements may be 

 summed in the statement that the microscope and its supports are immovable. 



