ANOTHER FORM OF STTJDENt’s MICROSCOPE. 
27 
focus is performed by a tine 
rack and pinion movement, by 
turning either or both of the 
milled heads at the back of 
the stage. 
The body of the instrument 
is attached to a strong arm by 
a bayonet joint, and can be 
easily removed to allow of 
packing into a small case. 
When the body is thus remov- 
ed, it can be used as a dissect- 
ing microscope by inserting 
into the arm lenses adapted to 
that purpose. 
This instrument is usually 
supplied with two eye-pieces, 
and with 1 inch and i inch 
objectives of second quality, 
giving four magnifying pow- 
ers, varying from 40 to 350 di- 
ameters. Other object-glasses | 
and accessory apparatus can ' 
be furnished, to suit the pur- 
chaers. 
This instrument is well adapt- 
ed for the use of students in botany and natural history, and 
also for schools and private families, who take an interest in 
the wonders revealed by the microscope. 
47. Aiiotlier form of Stiident^s Microscope is shown at 
tigure 9, mounted on a tripod base like No. 2, tigure 8, with a 
trunnion joint to incline it at any angle. It has plane and 
concave mirrors, mounted in the same manner as in No. 2. 
The body of this microscope slides smoothly and easily in a 
strong cylindrical support. A screw with a milled head. 
NO. 2. STUDENT’S MICROSCOPE. 
Twelve inches high when arranged for use. 
CATALOGUE OF ACHROMATIC MICROSCOPES. 
