340 



CENTEAL SCIENTIFIC CO., CHICAGO, U. 8. A. 



8536, 



8540. 



No. 8536. No. 8540. 



MICROSCOPE, Spencer No. 64. A standard microscope for general biology; used in hundreds of 

 laboratories. 



The Body Tube is our standard, 37 mm in diameter, taking standard objectives and oculars. 



The Arm and its side fine adjustment "D" are identical with those of Microscope No. 8532. 

 This adjustment is patented, is exceedingly durable, will withstand very hard usage and not 

 develop lost motion. (See description and diagram illustration under No. 8532.) It travels 

 laterally, giving an instant visible index of the position of the adjustment relative to the 

 total excursion. 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 0.2 mm. Adjustment ceases to work when objective comes in contact with slide. 



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

 stage plate. Beneath the stage is an iris diaphragm operated by a knurled wheel, 62 mm in 

 diameter. Abbe Condenser is supplied when ordered, and is fitted in a simple spiral focusing 

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



Furnished in hardwood cabinet, with lock and key. 



No 64A 



Abbe condenser 



Nosepiece 



Objectives, equivalent 



focus, mm 16,4 



64B 



double 



16,4 



64C 



16,4 



64D 



double 



16,4 



64E 



N. A. 1.20 

 double 



16,4 



64F 64H 



N. A. 1.20 N. A. 1.20 

 double 



triple 



16,4 



Achromatic oculars . . lOx 

 Each $36.00 



16,4,1.8 

 oil imm. 

 6x, lOx 

 85.00 



lOx 6x, lOx 6x, lOx lOx 6x, lOx 



40.75 37.75 42.50 49.75 51.50 



MICROSCOPE, Spencer No. 65. This instrument is similar to No. 8536, except for the shape of 

 arm and the type of fine adjustment. It is highly recommended for general laboratory work 

 and is a very high grade microscope at moderate cost. 



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



The Arm is fitted with the sensitive and accurate lever type fine adjustment. One revolution 

 moves the tube 0.5 mm. The action ceases to work when the objective comes in contact 

 with slide. 



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. Beneath the stage is an iris dia- 

 phragm operated by a knurled ring. 



A Substage Ring, with spiral slot for focusing the Abbe condenser, is supplied when ordered 

 or may be applied at any time without returning the microscope to the factory. An auto- 

 matic device locks the upper iris open when condenser is in place. The standard mirror, 50 

 mm in diameter, plane and concave, is supplied on the usual swinging mirror bar. 



Furnished in hardwood cabinet with lock and key. 



double double 



No 65A 65B 65C 65D 



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



Nosepiece double .... 



Objectives, equivalent 



focus, mm 16,4 16.4 16,4 16,4 16,4 



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



Each 33.00 37.75 34.75 39.50 46.75 



65E 65F 65H 



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



double 

 16,4 



triple 



16,4,1.8 

 oil imm. 

 6x, lOx 6x, lOx 

 48.50 82.00 



