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



No. 5102. 



No. F3879B. 



No. 5100. 



No. 5106. 



No. 5110. 



Insert Member 

 cf No. 5110. 



No. 5111. 



No. F3879D. 



F3867. TRANSFORMER, Laboratory. To meet the demand for a transformer of smaller capacity than 

 those listed under No. F3865, there has been developed a transformer of the same general de- 

 scription but smaller and having a voltage regulator giving eleven different voltages in steps 

 of 2^ volts, starting at 2% and going up to 27^ volts. It is 3%x3x3 inches, weighs 3 pounds 



and is designed for an output of 50 watts $3.00 



F3871. TRANSFORMERS, Step-up. These Transformers represent the highest type of construction, and 

 are perfect in every detail. Constructed with a magnetic shunt control to protect them from 

 all undue current surges. Designed to connect to any alternating current circuit. No imped- 

 ance coil or other resistance necessary. Can be used for Wireless Work, Generation of Ozone, 

 Testing Insulation, Electrostatic Separation, High Frequency Experiments, etc. 

 For operation on voltages ranging between 100 and 125 A. C., 60 cycles. Current regulates as 



per table below. No A B " C D 



Kilowatts % % 1 2% 



Secondary voltage 10,000 10,000 20,000 20,000 



Primary amperes 1 to 6 2 to 9 2% to 14 6 to 22 



Heightj inches 9 10 14 18 



Width, inches 4% 5 6 8 



Length, inches 9 10 12 14 



Weight, Ibs 28 31 46 60 



Each 20.00 25.00 30.00 55.00 



F3873. TRANSFORMER, Step-up, similar to No. F3871 but without the magnetic shunt; especially 

 adapted to wireless work. Capacity, ^4 k.w.; secondary voltage, 8000; size, 9x4V>x6 inches; 



weight, 13 Ibs " 12.00 



F3875. RESISTANCES, Non-inductive, for use with Nos. F3871-3 connected in shunt across the primary 



terminals for prevention of inductive kick-backs in the primary circuit Per pair 1.00 



F3879. TRANSFORMERS, Bell Ringing. Designed for ringing bells and buzzers and operating annun- 

 ciators, burglar-alarm systems and gas lighting systems. They are intended for connection 

 directly to the 110-volt, 60-cycle A. C. mains, are absolutely fireproof and may be short circuited 

 indefinitely without burning them out or impairing their efficiency. Dimensions, 15x10.5x11 cm. 



No ". A B C D 



Secondary voltage 6 6-14-20 6-12-18-24 10-25-35 



Capacity, watts 60 60 100 100 



Weight,' Ibs 7^ ?V> 9 9 



Each 6.00 7.00 9.00 10.00 



ELECTRICAL ACCESSORIES 



5100. ATTACHING PLUG, f useless, Edison, black moulded material with separable cover (No. 51161. 

 35 



5102. ATTACHING PLUG for multiple work, porcelain. One end fits any Edison receptacle or socket, 



and the other is provided with Edison socket for incandescent lamp. At the side is a separable 

 plug (No. 5116) for attaching a lamp cord which will be in multiple with the lamp in the 

 socket .75 



5103. ATTACHING PLUG for series work. Same as No. 5102 except that the lamp cori will be con- 



nected in series with the lamp in the socket .75 



