An invaluable accessory in the work of 
any scientist is the 
^auscii lomb 
Binocular Magnifier 
This little instrument is especially applicable to the purposes of botanists, 
zoologists, pathologists, bacteriologists and the like. It gives them the 
magnification they ordinarily require in their work, at the same time per- 
mitting them to use both eyes simultaneously and leaving their hands 
entirely free. 
Furthermore — and of particular importance — the binocular vision this 
magnifier affords, coupled with an optical arrangement of two rhombo- 
hedric prisms, gives the perception of depth so much desired. It enables 
the observer to see an object in well-defined relief, with practically 
natural perspective. 
Our binocular magnifier is made with the careful precision characterizing 
Bausch & Lomb microscopes and other optical instruments. It is fur- 
nished in five different magnifications, with or without illuminating attach- 
ment and with either fiber headband or elastic — both adjustable. 
Price — ^With illuminant and fiber headband, as illustrated. . . .$28.00 
Without illuminant and with elastic headline $15.00 
Write for descriptive circular 
Bausch y Ipmb Optical (5. 
NEW YORK WASHISGTON CHICAGO SAN FRANCISCO 
LONDON nOCH ESTER., N.Y. fRANKrORT 
