LABORATORY SUPPLIES AND CHEMICALS 



347 



6186 



6186 MICROSCOPE Spencer^ Lens Co. No. 64. This microscope has proven a 

 standard of its own. It is exceedingly desirable for general biology and is 

 in daily use in hundreds of laboratories. 



The Body Tube is our standard, 37 m.m. in diameter, taking standard 

 objectives and oculars. 



The Arm and its Side Fine Adjustment "D" are identical with Micro- 

 scope No. 44. This adjustment is patented, is exceedingly durable, will with- 

 stand very hard usage and not develop lost motion. (See description and 

 diagram illustration under No. 44.) It travels laterally, giving an instant 

 visible index of the position of the adjustment relative to the total excur- 

 sion. Steel pins in heads of buttons produce an absolute stop at either 

 end of excursion, preventing jamming or binding of screw. There are 

 but two bearing surfaces and three working parts. The main bearing is 

 made of one single piece. One revolution moves the tube .2 mm. Ad- 

 justment ceases to work when objective comes in contact with slide. 



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

 vulcanized directly to the stage plate. Beneath the stage is an iris dia- 

 phragm operated by a knurled wheel, 62 mm. in diameter. Abbe Con- 

 denser is supplied when ordered, and is fitted in a simple, spiral focusing 

 substage ring. Distance is 80 mm. from optical center to arm. 

 Furnished in hardwood cabinet, lock and key. 



