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



No. 7520. ! No. 7514. No. 7518. 



7514. HEATERS, Electric Combination Flask, Sand Bath, and Hot Plate. Constructed with replace- 



able unit, and with housing of heavy sheet steel containing rheostat for temperature control. 

 Upper part of casing is flanged to form slide for several appliances. Maximum temperature 

 obtainable, 540C. (1000F.), which can be controlled sufficiently low for ether extractions. 

 Complete with Hot Plate Slide, 8x9 inches; Flask Heater Attachment, 6x3% inches; two 

 Sand Bath Attachments, 4 and 6 inches by 3% inches deep; and with connecting cord and 



plug. No A B 



For volts 110 220 



Each $42.50 42.50 



7515. EXTRA HEATING UNITS for No. 7514 4.00 4.00 



7518. HEATERS. Electric Immersion Coils, for heating water baths, thermostats, etc., with three 



heats. Complete with five-foot cord and regulating switch. May be used on either AC or 



B.C. No A B C 



Diameter of coil, inches 6% 8 1 /^ 11 



Depth of coil, inches 3 4 4% 



Height from bottom of coil to bottom of handle, inches 9 13 18 



Minimum power consumption, watts 110 275 500 



Maximum power consumption, watts 440 1100 2000 



Each 15.50 22.00 33.00 



In ordering, kindly state voltage. 



7520. HEATERS, Electric Immersion, Cylindrical form, made of copper and brass, nickel-plated. 

 Diameter of cylinder, % inch; length of heater, 7 inches; weight, % pound; power eon- 

 sumption, 350 watts. Complete with connecting cord, attachment plug and special switch- 

 plug. No A B 



For volts 110 220 



Each 4.50 5.50 



7522. HEATERS, Electric Immersion, Portable Disk Type, for use in water baths, paraffine baths, 

 etc.; made of non-corrosive metal throughout. Complete with six feet of connector cord, 

 separable attachment plug, connection plug and through switch. For 110 volt circuit only. 



No A B C 



Diameter of disk, inches 3 4 5 



Length of handle, inches 7% 8% 9 



Power consumption, watts 250 425 660 



Number of heats 1 3 3 



Shipping weight, pounds 2 3 4 



Each 6.00 9.00 9.50 



