344 HOW TO SEE WITH THE MICROSCOPE. 



MICROSCOPES A!S"L> OBJECTIVES BY THE BAUSCH & 

 LOMB OPTICAL COMPANY. 



The Professional Microscope, with the following acces- 

 sories : Hemispherical immersion condenser and ob- 

 lique light projector, plain and concave mirrors, sub- 

 stage, receiving accessories of standard English size, 

 two revolving diaphragms, sub-stage with internal 

 " society screw," 2 slot diaphragms for mirror, 3 Gund- 

 lach's periscopic eye pieces (B, C and D), four object- 

 ives, viz : 2-inch, l-5th inch, 3-4th inch and l-8th inch 

 immersion, with adjustment for cover, magnifying 

 powers from 30 to 800 diameters, eye piece micrometer, 

 camera lucida, bull's eye condenser, the whole in 

 upright walnut case, with handle, lock and key, and 

 drawer for accessories $200 00 



Large Student's Microscope, plain and concave mirrors, 

 sub-stage of extra size to receive standards, English 

 accessories, revolving diaphragm, etc., all attached to 

 the swinging mirror bar ; sub-stage and mirror are re- 

 movable ; three eye pieces, A, B and C, three object- 

 ives, 2-inch, 3-4th inch and l-5th inch, magifying from 

 22 to 375 diameters, eye piece, micrometer, camera 

 lucida, in upright walnut case, with handle, lock and 

 key, and drawer for accessories 90 00 



Family Microscope, concave mirror, adjustable for ob- 

 lique light, one (B)eye piece, one first-class achromatic 

 objective (one-half inch dividing) powers, 50 and 100 

 diameters, in upright walnut case, with handle, lock 

 and key 20 00 



The Messrs. Bausch & Lomb have brought out a new model 

 which they term the Physicians' Stand, which may be thus de- 

 scribed : 



Large, heavy cast iron foot, rack and pinion for coarse 

 adjustment, draw-tube, allowing 2 1-2-inches shorten- 

 ing, fine adjustment by a new frictionless motion, large 

 hard rubber stage, sub-stage of standard size, carrying 



