66 



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



No. 940. 



No. 946. 



No. 948. 



No. 958. 



BATTERIES, PRIMARY 



940. 



941. 

 942. 

 943. 

 944. 

 8040A 

 946. 



BATTERY, Buuseu, for open circuit work. A powerful two-fluid cell of about 1.9 volts E. M. F. 

 and 1.86 ohms internal resistance. An excellent cell for operating induction coils, motors, etc., 

 and for electrolysis of water. Quart size, complete without chemicals $2.25 



CARBON for No. 940. 



948. 



949. 

 950. 

 951. 



958. 



959. 



960. 



961. 



8040C. 



.12 



ZINC CYLINDER with binding post for No 940 1.50 



CLAMP for No. 941 Carbon, with binding post for wire 



POROUS CUP, 2x4 inches, for No. 940 1 



GLASS JAR, 4x5 inches, for No. 940 



30 



35 



20 



BATTERY, Burn-Boston Addwater. A battery containing an exact balance of active elements, 

 zinc, carbon, and salt solution. 



In dry cells destruction of the elements goes on continuously, whether used or not. In the Burn- 

 Boston this process is arrested while the current is not being used. 



The zinc shell, being insulated from the electrolyte, cannot be acted upon by it. Except for a 

 pin hole vent the cell is tightly sealed. All sources of leakage are thus done away with. 



Distinctive Features. 



(1) Yields from three to twelve times the service of dry cells. 



(2) "Will never leak or burst. 



(3) Can be stored, fully charged, for any length of time and in any climate. 



(4) "Will yield all of its phenomenal electrical content whether the period of use is three months 

 or three years. 



Size, 7V^x2li^ 6 x2ii/i 6 inches; voltage, 1.5 volts; amperage, 20 amperes 1.25 



BATTERY, Carbon Cylinder, for open circuit work. Well adapted for all telephone and bell 

 service. Initial output, 1.4 volts, 6 amperes. Cell complete with chemicals 70 



CARBON for No. 948 40 



ZINC ROD with binding screw for No. 948 08 



GLASS JAR for No. 948 30 



BATTERY, Daniell, gallon size. This has been the standard cell for many years for open or 

 closed circuit work. The best for all laboratory work in electrical measurements. Next to the 

 standard cells, it gives the most constant E M. F., about 1.08 volts, which remains the same dur- 

 ing the life of the cell. Internal resistance from 2 to 5 ohms. With new form riveted copper 

 pocket for holding copper sulphate crystals. Complete without chemicals 2.00 



COPPER, New Form, with riveted copper pocket, for No. 958 80 



ZINC, weight about two pounds, with binding screw attached, for No. 958 60 



POROUS CUP, 3x7 inches, for No. 958 50 



GLASS JAR, 6x8 inches, for No. 958 40 



