48 
When using a revolving nose-piece with these smaller stands 
a clamping ring (ffl. 5. — ) will be found convenient ; this pre- 
vents the tube from sliding down in consequence of the weight of 
the nose-piece and the objectives attached thereto. 
The sliding objective-changer No. 25 is not appli- 
cable to stands VI and VII, owing to the small distance between 
the tube and the stage. 
StEnd IX. Simple stand for laboratory and technical purposes. 
Plain large stage of 100 mm (4") dia. with large aperture, which 
may be decreased if required by dropping in a diaphragm. 
Large plane and concave mirrors. 
Adjustment by rack and pinion, the construction of which 
still admits, however, of the use of medium powers (C, D). (Fig. 13.) 
Recommended by Prof Johne (Veterinary School, Dresden) 
for the detection of Trichina (M. 70. — inch objective and 2 eye- 
pieces). 
Fig. 14. Hand Microscope. 
(Va fall size.) 
Hand Microscope for demonstration in classes, stage with 
clips to hold the specimen ; sliding tube, which after adjustment 
is securely fixed by a clamping ring. Fine adjustment may be 
effected by altering the position of the eye-piece. In use it is 
directed by hand towards a window or lamp. Available even with 
objective D. Without objective, eye-piece and case (Fig. 14). . 
