346 



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



8682. 



8683. 



8684. 



8685. 

 8688. 



8689. 

 8690. 

 8691. 

 8694. 



8695. 

 8696. 



8697. 

 8698. 



8699. 

 8700. 



3701. 

 8702. 

 8703. 

 8704. 



No. 8682. 



No. 8694. 



LAMP, Hand-Peed Arc, the most powerful light source for microscopical work. It may be run 

 on any house circuit, either A.C. or D.C., using the proper rheostat. The carbons may be 

 moved independently or at the same time. A window is provided for observing the arc. The 

 light rays are focused by means of a condenser in a sliding tube. A blue glass and a ground 

 glass are provided, to fit in a groove in front of the condenser. The lamp is adjustable as to 

 height and angle. Complete with blue and ground glass filters, cord and connecting plug but 



without rheostat or carbons $18.00 



RHEOSTATS for No. 8682, fixed form, 5 amperes. 



No A B 



For volts 110 220 



Each 7.00 10.00 



EXTRA CARBONS for No. 8682 each .06 



per dozen .60 



DAYLITE GLASS AND ADAPTER, for No. 8682 2.00 



LAMP, Microscope, Miniature Electric, small but very efficient, measuring 2x2x3 % inches, low 

 enough to work beneath the substage condenser. It is usually used in this position, it then 

 being necessary to swing the mirror of the microscope to one side. The back and base of 

 the lamp are wood, making its use entirely safe for laying on a polished desk or other such 

 surface. The frame is metal, finished with permanent crystal black which is very durable. 

 The bulb is a 15-watt gas-filled, concentrated filament, and may be used directly on any 110- 

 volt circuit, either direct or alternating. It may be used on 220-volt current with Eheostat 

 No. 8691. A metal reflector behind the bulb concentrates the light and no light can escape 

 except through the single opening. The intensity of illumination is ample for the use of 1.8 

 mm oil immersion objective and lOx ocular. Complete with five feet of cord and attachment 



plug with bulb, and blue and ground glasses 4.25 



LAMP, Microscope, same as No. 8688, but with Daylite glass 4.75 



EXTRA BULBS for Nos. 8688 and 8689 each 1.25 



RHEOSTAT for use in series with Nos. 8688 and 8689 on 220-volt circuit 3.00 



LAMP, Microscope. Spencer No. 370, adjustable in height and angle, and fitted with standard 

 pear-shaped, gas-filled bulb, usable on any 110-volt circuit. The bulb is used end-on, with a 

 reflector behind it, giving ample illumination for 1.5 mm oil immersion objectives and high 

 power oculars. Very serviceable for illuminating opaque objects and for work with a binoc- 

 ular microscope. Complete with five feet of cord and attachment plug, key socket, and with 

 75-watt 110-volt blue glass gas-filled Mazda bulb. Finished in durable crystal black . . 9.00 



EXTRA BULB for No. 8694, 75-watt 110-volt, blue glass 1.00 



LAMP, Microscope, same as No. 8694, but with 100-watt 110-volt blue glass gas-filled Mazda 

 bulb 9.75 



EXTRA BULB for No. 8696, 100-watt 110-volt, blue glass 1.65 



LAMP, Microscope, same as No. 8694, but with 75-watt 110-volt clear glass gas-filled Mazda 



bulb, fitted with condenser and with blue and ground glasses 10.00 



EXTRA BULB for No. 8698, 75-watt 110-volt, clear glass 90 



LAMP, Microscope, same as No. 8698, but with 100-watt 110-volt clear glass gas-filled Mazda 



bulb, fitted with condenser and with blue and ground glasses 10.5C 



EXTRA BULB for No. 8700, 100-watt 110-volt, clear glass 1.25 



LAMP, Microscope, same as No. 8700, but with Daylite glass 12.50 



RHEOSTAT, for use with Nos. 8694 and 8698, on 220-volt circuit 5.00 



RHEOSTAT, for use with Nos. 8696, 8700 and 8702, on 220-volt circuit 6.00 



