li SCIENCE—ADVERTISEMENTS 
LEITZ’ 
Large Microphotographic Apparatus la 
New Model <§ New Model 
FEATURES : 
Can be used both in Vertical and Horizontal Position. 
The New Principles involved in the construction of this apparatus are with the 
purpose of eliminating entirely all vibration, thus enabling the operator 
to proceed under the most favorable conditions. 
All of the various optical parts are mounted on an optical bench consisting 
of two heavy steel tubes, thus preventing vibration. 
Camera mounted on separate steel tubes entirely independent of supporting 
bench, so when in vertical position leaves the entire bench undisturbed. 
(See cut.) This is a further assurance of stability, 
Platform for the microscope provided with wheel arrangement for raising and 
lowering the same, so as to place microscopes of different sizes conven- 
iently into the optical axis. 
Tiluminating lenses with diaphragms are provided separately with photo- 
lenses (Leitz’ Microsummars), and are specially adjusted to each individual 
focal length. The effect of such an arrangement is an absolutely evenly 
illuminated field, very important in photographing coarse specimens. 
Send for complete description. 
Special duty free prices to educational institutions. 
United States ¢ New York 
Branch 30 East 18th St. 
