38 
B. Stands of Medium Size. 
No. 
7 
Stand II* similar to 1\ stage with revolving vulca- 
nite disc of ICK) mm (4") diameter, wliicli is centered by two 
milled-head screws and counter-spring and, within small limits, 
can be used as a tine stage movement. 
Coarse and fine adjustments as in the preceding 
instruments. 
Abbe illuminating apparatus No. 17 with iris diaphragm 
and condenser system of 1.40 num. apert. (Fig. 7) 
Marks 
290. 
The prices of stands do not include any optical or mechanical parts beyond 
those enumerated in the above specification. Suitable combinations are com- 
piled at the end of the catalogue. 
