CAMERA AND PHOTOGRAPHIC APPLIANCES 21 



in unison; absolute steadiness, when so em- 

 ployed, and the means for placing them in 

 position accurately and without loss of time. 



It will be vastly better, however, to obtain at 

 the outset a camera specially devised for photo- 

 micrographic work, and to have it always in 

 readiness for immediate use, since it fre- 

 quently happens during microscopic exami- 

 nations that objects are found which require 

 to be photographed or drawn at once. With 

 a camera always ready, the microscope may be 

 very quickly attached and the record made. 

 There are a number of such cameras in the 

 market some to be used with the microscope 

 in vertical position only; others are adapted 

 to the horizontal alone, whilst a third class 

 combines the two in a single instrument. Of 

 the latter, the best form I have seen is one by 

 the Bausch & Lomb Optical Company. Like 

 all of their apparatus, it is very well made, is 

 equally firm and steady in all positions, and sold 

 at a fairly moderate price. The accompanying 

 illustration (Fig. 2), showing it horizontally 

 inclined, gives a good idea of its design. 



Probably the best strictly vertical photo- 

 micrographic camera is that of Zeiss from the 

 world-renowned works at Jena. A heavy tri- 

 pod-bar carries a column in which a rod grad- 



