CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 



339 



MICROSCOPES 



We desire to advise our friends and patrons that we are agents for the celebrated Spencer Micro- 

 scopes, manufactured by the Spencer Lens Company, and carry a complete stock of all Microscopes 

 listed herein. The Spencer Microscopes are of recent design and contain many important features 

 not possessed by any other microscope in the world. The Spencer lenses are guaranteed against all 

 defects. We will be glad to send any one of the Spencer Microscopes to responsible persons for com- 

 parison, grade for grade, with any objective or stand of American or European manufacture, with 

 the utmost confidence that the Spencer will be found to be unsurpassed by any and only equaled by 

 few. We unhesitatingly recommend the Spencer Microscopes as representing better values than any 

 other instrument on the market. 



No. 8532. 



Diagram of Side Fine 

 Adjustment "D." 



8532. MICROSCOPE. Spencer No. 44, the most popular of all Spencer Microscopes. Many hundred 

 are in daily use in medical, educational and general laboratories. 



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



The Arm is strong and very graceful, fitted with the patented side fine adjustment "D," 

 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 lever. L. When the screw is turned in such a direction as to 

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

 mits 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 adjust- 

 ment 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 the tube 0.2 mm. 



The Stage, 112x108 mm, is completely covered with hard rubber, vulcanized directly to the 



stage plate. Distance is 80 mm from optical axis to arm. 

 The Substage is standard quick-screw form. 



The Down-Swing Condenser Mounting may be supplied at $7.50 additional. 

 Furnished in hardwood cabinet with lock and kev. 



Xo 44A 44B 440 44D 



Abbe condenser .... .... .... 



Xosepiece double .... double 



Objectives, equivalent 



focus, mm 16,4 16,4 16,4 16,4 



Achromatic oculars. . Iflx lOx 6x. lOx 6x, lOx 



Each $44.50 49.25 46.25 51.00 



44E 44F 44H 



N. A. 1.20 N. A. 1.20 X. A. 1.20 



double double triple 



16,4 



58.25 



16,4 



6r, lOx 



60.00 



16.4.1.8 

 Oil imm. 



<">x, lox 

 90.00 



