
‘S 
BAUSCH & LOMB 
PORTABLE BALOPTICON MODEL C, $35.00 
@ The advantages of ocular teaching are now very 
generally recognized. What the pupil sees with his physical- 
eye, he can the better comprehend. 
@ To be able to throw uponthe screen the “ vital points” 
so that the pupil can see them with his physical eye, is not 
ofily to add to his comprehension of the subject, but the more 
surely to fix the facts in his memory. 
@ In our Model C we have provided a projection lantern 
of strong, simple construction, which anyone can operate, and 
while built on the most scientific lines, and of the very highest 
grade of workmanship, it is very reasonable in price. All 
parts are standardized so that attachments for opaque and 
microscope projection can be added at any time. 
@ Catalog D-g sent on request. 
Our Name on a Photographic Lens, Micro- 
®\ scope, Field Glass, Laboratory Apparatus, 
3) Engineering or any other Scientific In- 
strument is our Guarantee. 
Bausch £3 lomb Optical ©. 
BEW YORK WASHINCTON CHICAGO SAN FRANCISCO 
LONDON. ROCHESTER, N.Y, “FRANKFORT” 
| METROPOLI TAN 
= 
aes ‘ 
% 
saBee 
ABIE 
Beassae 







jaa aae 

Se 
é 
7“ 
a 
TEN CENTS FIVE CENTS |} 



‘Refracting and Reflecting 
Astronomical Telescopes 

Standard and Portable 

Visual and Photographic 
OBJECTIVES 
Computed by our associate - 
DR. F. R. MOULTON 
(Chicago University) 

OBSERVATORIES 
Specula, Planes, Eyepieces, etc. 


« 
“ 
Photographs and Circulars on request 
‘ LOHIANN BROS. 
lllustration shows 5-in. with pneumatic clock. GREENVILLE, OHIO °:: ss iS 
2 
-e 
es 
