SCIENCE 
ay ae ees Peenuany 28) 1012 | |) | yeuen Ceo 
VoL. XXXV. No. 895 
Pe clileeak 
Convertible 
Balopticon =~ 
This comprehensive projection instrument is a valuable and im- 
portant aid in science classes. It accomplishes every known 
form of projection. 
Lantern slides by direct illumination; Opaque objects up to six inches 
square (in vertical and horizontal planes, as may be desired); Micro- 
scopic objects, polarized light and physical experiments. 
It is especially adapted to school use because of its wide range of 
Our name, Backed application and the ease and convenience of manipulation. 
by over half a century 
of experience, is on all 
our products — lenses, 
microscopes, field Bausch 5 lomb Optical (CO. 
glasses, projection ap- 
paratus, engineering NEW YORK "WASHINGTON _ CHICAGO SAN FRANCISCO 
and other scientific LONDON ROCH ESTER. NY, FRANKFORT 
instruments. 
Descriptive Circular 15 D sent on request. 
