206 



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



No. F4473. 



No. F4475. 



F4454. 

 F4456. 



GALVANOMETER, D'Ars'onval, Table Form. Same as No. F4453, but mounted on a heavy tripod 



for table use $37.50 



COIL SYSTEMS, Dead Beat, for Nos. 4453-4. 



No. 



Resistance, ohms 

 Each 



F4457. COIL SYSTEMS, Ballistic, for Nos. 4453-4. 

 No 



Resistance, ohms 

 Each 



A 



5 



7.50 



B 



250 

 7.50 



C 



500 

 8.00 



ABC 



150 500 1000 



8.50 8.50 9.00 



F4461. GALVANOMETER, Portable, Student's, 9 cm wide by 9 cm high, with inclined scale. With 

 one volt a deflection of 1 millimeter (1 scale division) will be obtained through 62,500 ohms. 

 Suitable for elementary Wheatstone Bridge work. Complete with zero adjusting device. 

 11.25 



F4463. GALVANOMETER, Portable, D 'Arsonval Type, as used in commercial testing sets, and built for 

 hard service. Gives 1 scale division deflection with 1 volt through about 100,000 ohms. 15.00 



F4465. GALVANOMETER, Portable, D'Arsonval Type, as used in our No. F4749 Testing Set. Has a 

 suspended coil system so that all troubles due to the dulling of the pivots as in the old style 

 instruments is entirely obviated. Sensibility, 1 megohm, i. e., gives one scale division deflec- 

 tion with one volt through 1,000,000 ohms. Mounted on a substantial hard rubber top in a 

 finely finished hardwood case 50.00 



GALVANOMETER ACCESSORIES 



F4473. UNIVERSAL SHUNT, Ayrton-Mather. This shunt may be used with any galvanometer, and 

 therefore is far more useful than the ordinary type of shunt. The total resistance is 10,000 

 ohms, with shunt powers of 1, 5, 10, 50, 103, 500 and 1000. It is also fitted with a position in 

 which the galvanometer is shorted through 10,000 ohms, and one in which both circuits are 

 open All adjustments are made by turning a knob of hard rubber. Mounted in a fine ma- 

 hogany case with hard rubber top 35.00 



UNIVERSAL SHUNT, simpler design than No. F4473, but suitable for use with any galvano- 

 meter, and therefore far more useful than the ordinary type of shunt. The total resistance 

 is 5000 ohms, which is sufficiently high for use with any of the galvanometers listed in our 

 catalogs. It is arranged for shunt powers of 1, 10, 100 and 1000, the different adjustments 

 being made by use of a single plug. When the plug is at the zero position the main circuit is 

 complete, but no current can flow through the galvanometer. Mounted in a brass case with 

 wood base and hard rubber top 20.00 



