SCIENCE 



Nnr Bsmizs 



Vol. XLVI. No. 1200 



Friday, December 28, 1917 



SiNpLB Copies, 15 Cts. 

 Annhal Sdbsoription, $6.00 



Combined Drawing 



and Photomicrogra- 



phic Apparatus 



A laboratory equipment of many 

 possibilities, including drawing, pho- 

 tomicrography, gross photography, 

 microscopical projection and illmni- 

 nating purposes in microscopical re- 

 search work. 



The practicability of this versatile 

 apparatus has been further increased 

 by equipping it with a 6-volt concen- 

 trated filament Mazda lamp — entirely 

 automatic and especially desirable 

 where alternating current is to be 

 used. Can also be supplied with 4}/2 

 ampere, hand-feed arc. 



Any regular microscope can be used with the apparatus. The 

 magnified image is formed directly on the drawing paper, and a wide 

 range of adjustments enables the user to regulate both light and 

 magnification easily. AU accessories are mounted on one solid sup- 

 port, insuring rigidity and accurate alignment. 



Write for new descriptive circular 



552 ST. PAUL STREET ROCHESTER, N. Y. 



New York Washlnfi^ton Chicago San Francisco 



Leading American Makers of Photographic Lenses, Microscopes, Pholomicrographic 



and Projection Apparatus (Baloplicons) Stereo-Prism Binoculars and other 



High-Grade Optical Products 



