OF OPTICAL INSTRUMENTS. 



105 



FIG. 1129. 



1127. Presentation Binocular Microscope^ of extra large size, and very superior 



and elegant finish. The thin concentric stage is the latest improved, and 

 divided to 360 degrees. The stage plates are divided to the 50th of an 

 inch in rectangular directions, with vernier for measuring the natural size of 

 objects under examination, and acting also as a finder in viewing diatoms, 

 etc., being worked round by means of an inverted crown rack. The sub- 

 stage is also of the newest construction, with complete universal motions, etc., 

 divided as above, clamp to axis of stand, best lever fine adjustment, double- 

 jointed arm to mirrors with clamp milled head. The bodies are of extra large 

 diameter, improved expanding diaphragm, stage and bottle forceps, pliers, extra 

 large condenser on stand with 3-inch, condensing lens, polarizing apparatus, 

 with extra krge prisms and complete set of eye-pieces, viz., two each of 

 A, B, and C 55 10 



1128. Handsome Glass Shades, with richly moulded black stand, are often supplied 



with either of the foregoing and most of the following microscopes, instead of 

 mahogany cases, at 12s. 6d. to 1 10s. each. 



