208 



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



No. 4704. 



No. 4708. 



No. F3665. 



No. F3681. 



4704. GENERATOR, Electric Charging Dynamo, for charging storage batteries. Similar to No. 4708, 

 but larger, weighing 23 Ibs. Generates 7 volts, 11 amperes, at 2000 r. p. m $25.00 



4706. GENERATOR, Electric Plating Dynamo. Similar to No. 4704, but wound for 4 volts, 15 am- 

 peres 25.00 



4708. GENERATOR, Experimental Dynamo. A shunt-wound dynamo particularly desirable for experi- 

 mental purposes. It will light to full power twelve 6 volt 3 C. P. lamps. The field is of the 

 ring type, cast solid with the frame. The coils are form wound, carefully taped and shellacked; 

 they are entirely safe from mechanical injury or breakdown. The armature is of the drum 

 type, laminated, slot wound it does not heat. The commutator is of hard copper, carefully 

 insulated with mica. The brush holders are of new design, of the radial type, mounted on an 

 adjustable yoke. The brushes are of woven wire, self-adjusting they do not spark. The 

 bearings are of hard bronze, nicely fitted; workmanship throughout the best. Finished in black 

 enamel. Fitted with 1^-inch grooved pulley. Length of shaft, 6 inches. Weight, 9 pounds. 

 Occupies space 6x4%x6 inches. At speed of 2200 r. p. m., the output is 36 Watts (6 volts, 6 

 amperes) 12.50 



HOT PLATES, see general heading Hot Plates. 



F3681. INDUCTION COIL, with adjustable vibrator or interrupter, commutator and condenser, wound 

 with insulated wire. (The coils ordinarily sold are French coils wound with bare wire.) 

 Mounted on finely polished mahogany box. 



No A B C D 



Spark length, mm 6 13 18 25 



Each i 5.00 9.00 12.00 15.00 



F3665. INDUCTION COIL, equipped with a patented mechanical circuit breaker, which is mounted in- 

 dependently on a heavy piece of enameled slate. This makes the construction very rigid and 

 increases the efficiency of the coil. The secondaries are built in sections and each section is 

 wound in layers. Three special means of adjustment are provided, allowing a wide range of 

 regulation, so that the coil is adapted for a large variety of work. Complete with a double 

 pole, double throw knife switch. The 150 mm coil will produce a heavy 150 mm spark with 

 an input of 4 volts, 6 amperes (24 watts) ; the other coils take a proportional input. 



No A B C 



Spark length, mm 50 75 150 



Each 30.00 40.00 75.00 



LAMPS, Incandescent, see general heading Lamps. 



