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A. DAIGGER & COMPANY, CHICAGO, U. S. A. 



6188 



6188 MICROSCOPE, Spencer Lens Co., No. 44-H. This instrument has pnoven the 

 most popular of all Spencer Microscopes. Many hundred are in daily 

 use, in medical and general laboratories, also by physicians. This, we 

 believe, is the best microscope value on the market. 



The Body Tube is standard, taking standard objectives and oculars. 



The Arm is strong and very graceful, fitted with Side-Fine Adjustment 

 and possessing many exclusive features. It has but two bearing surfaces 

 and three working parts. The patented one-piece construction bearing 

 carries the solid steel screw. This screw, with no less than twenty threads 

 engaged even at the limit of its motion, has a heavy flange, F, working 

 against the level, L. When the screw is turned in snch a direction as to 

 carry F forward, the lever is so swung as to raise the body tube. The 

 reverse motion permits the tube to be lowered under the influence of 

 the spring, The focusing buttons at either end of this screw travel 

 laterally and serve as a visible index of the center of the fine adjustment 

 action. Steel pins in the heads form positive stops at either end of 

 the excursion. The direction in focusing is the same with both fine 

 and coarse adjustments. One revolution moves tube .2 mm. 



The Stage, 112x108 mm., is completely covered with genuine vulcanite 

 rubber, vulcanized directly to the stage plate. Distance is 80 mm. from 

 optical axis to arm. 



The Substage is standard quick-screw form. 

 Furnished in hardwood cabinet, lock and key. 



Equipped with Huyghenian Oculars 6x and lOx, objectives 16 mm. (2/3"), 

 4 mm. (1/6"), dry, and 1.8 mm. (1/14") immersion, triple nosepiece, quick- 

 screw substage, Abbe Condenser N. A. 1.20 with iris diaphragm. Com- 

 plete in cabinet $90.00 



