ZOOLOGY AND BOTANY, MICROSCOPY, ETC* 
o59 
MICROSCOPY. 
a. Instruments, Accessories, &c.* 
(1) Stands. 
Portable Microscope by Nachet & Sons. — Mr. E. E. Hill writes, 
“ This compound Microscope is probably the smallest and most compact 
instrument in existence. It has many advantages over similar instru- 
ments, although it has some defects. The instrument is made throughout 
of brass, and when enclosed within its case measures 3 J by 2 by 1 J in. and 
weighs 15 oz. ; when the draw-tube is pulled out to its fullest extent, a 
tube-length of 4^ in. is obtained. It has one Huyghenian eye-piece and 
four object-glasses, all mounted specially short. The stage is formed by 
the end of the brass case and a portion of the top springing open as 
Fig. 52. 
soon as the portion to which the limb of the instrument is attached is 
pulled away to open the case. The limb of the instrument slides on a 
grooved fitting and is retained in position by a small clamping screw. 
The fine-adjustment is of the direct spring form and is brought into 
operation by means of the milled head. The distance of the optic axis 
from the limb of the instrument is 3/4 in. ; this is a defect for working 
with 3 in. by 1 in. slips, but for field and pond work a series of 6 slips 
2 in. by 3/4 in. (3 with hollow and 3 plain) are supplied and packed 
into a small leather-covered case which packs inside the brass case. The 
* This subdivision contains (1) Stands ; (2) Eye-pieces and Objectives ; (3) Illu- 
minating and other Apparatus; (4) Photomicrography; (5) Microscopical Optica 
and Manipulation ; (6) Miscellaneous. 
