CENTRAL SCIENTIFIC CO., CHICAGO, IT. 8. A. 



229 



No. 5134. 



J> 



No. 5156. 



No. 5148. 



No. 5140C. 



F3552, 

 F3553, 

 F3561, 

 F3562, 

 F3.363 

 5132. 



.3134. 

 5136. 



5140. 



5148. 



5150. 

 5156. 



SWITCH, Rubber Base, 2 point, with binding posts. Base about 5x7.5 em $1.30 



SWITCH, Kubber Base, 4 point, with binding posts. Base about 7.5x7.5 cm 1-85 



SWITCH, Wood Base, 1 point, about 6.5 cm in diameter 15 



SWITCH, Wood Base, 2 point, about 6.5 cm in diameter 17 



SWITCH, Wood Base, 4 point, about 6.5 cm in diameter 26 



SWITCH, Push Through, for use on lamp cord, for 125 volts, 6 amperes or 250 volts, 3 amperes: 



black moulded material 60 



SWITCH, Snap, double pole, slotted porcelain base, for 250 volts or less, 10 ampere current. Indi- 

 cates whether current is on or off 1-00 



TAPE, Insulating, cloth base, % inch wide, black, best quality; will not dry out. In quarter 



pound rolls Per roll .25 



TELEPHONE APPARATUS, see Catalog F of Physical Apparatus. 

 For other ELECTRICAL APPARATUS, see Physical Chemistry Apparatus. 



ELECTROLYTIC OUTFIT, Braun, for the quantitative separation of metals. Extensively used 

 for determining copper by the rotating anode. A complete determination can be made by 

 this method in less than half an hour. The apparatus is equipped with a motor mounted at 

 one side to which a line shaft is attached, from which each unit is driven by a special fric- 

 tion device enabling the operator to use one or more units at one time. The speed is regu- 

 lated by a rheostat. A separate rheostat controls the current supplied to the individual 

 units, each unit having an individual switch. Revolving anodes and gauze cathodes should 

 be used. The ammeter, line shaft, bearings, switches, etc., are all enclosed in glass to pre- 

 vent coming in contact with acid fumes. The lower portion of the cabinet is covered with 

 aluminum and the binding posts are also made of this material. 



Direct Current is necessary and where Alternating Current only is obtainable a Motor-Gen- 

 erator Set should be obtained. (See Xos. 4824 to 4848.) 



Complete with ammeter, rheostats for motor and units, and stands for breakers, with instruc- 

 tions for mounting and operating. Without platinum electrodes. 



No A B C 



Number of units 2 4 6 



Each 125.00 175.00 225.00 



For PLATINUM ELECTRODES, see general heading Platinum Ware. 



ELECTROLYTIC SUPPORT, with glass rod mounted on japanned iron tripod base, ring for 



dish with three platinum contact points and clamp for anode. Binding posts are provided 



on both ring and clamp. Height of rod, 11% inches; diameter of ring, 2% inches.... 4.50 



ELECTROLYTIC SUPPORT, same as Xo. 5148, but with two clamps with binding posts 4.50 



ELECTRIC ROTATOR for Anodes, with motor, adjustable bracket, spindle with chuck for 



holding anode, and three step pulley. Complete with rheostat for controlling the speed 



No A B C D 



A.C. D.C. 



For volts 110 220 110 220 



Each 27.50 31.50 27.50 31.50 



