CHAS. LENTZ & SONS 
Barnes* Dissectins microscope 
T AND TT 
An extremely popular microscope, designed by Professor Charles R. Barnes, 
University of Wisconsin. 
The body of the microscope is of neatly finished wood, the sides being shaped 
to form hand rests. The lenses are carried in a metal lens arm, movable above 
the stage, and are readily focussed by a vertical movement of the arm, which is 
nicely adjusted in a metal sleeve. 
A metal plate is supplied for black and white background. 
This microscope has been furnished to hundreds of schools for elementary 
botanical and zoological work. 
Tl. Stand as shown in figure, with one Doublet Lens, any power $2 50 
T2. Stand as shown in figure, with two Doublet Lenses, any power .... 3 25 
TTl. Stand as above, but with iron base, forming receptacle for dissecting 
instruments, etc., and with one Doublet Lens, any power 3 00 
TT2. Stand as above, but with iron base, forming receptacle for dissecting 
instruments, etc., and with two Doublet Lenses, any power ... 3 75 
Coddington Lenses, mounted for T and TT stands, each 1 50 
DOUBLET LENSES FOR DISSECTING MICROSCOPES 
These lenses consist of two lenses in fixed mounting of suitable form to be 
used with the various dissecting stands, and are intended to take the place of the 
simple lenses, as they give larger and flatter field, better definition, and longer 
working distance, and are supplied at the same price. 
No. 
Magnification. 
Focus. 
Price. 
1 
7 
I z in. 
$0 75 
2 
10 
I in. 
75 
3 
15 
1 in. 
75 
4 
20 
] in. 
75 
5 
40 
1 in. 
76 
The diameter of the mountings of these lenses is one inch. Doublet Magnifier Nos.i to 5 
32 
