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



209 



No. 4496. 



No. 4512. 



METERS, POCKET D. C. 



These meters are of the permanent magnet type and are extensively used for rapidly measuring the 

 polarity, voltage and amperage of batteries. They are exceedingly dead beat, being made so by the 

 relation of the moving system to the magnetic field and not by friction or air vanes, as in other types. 

 Each instrument is packed in a chamois bag. 



4492. AMMETER. Range 0-30 amperes $1.00 



4494. VOLTMETER. Range 0-10 volts 1.00 



4496. VOLT-AMMETER. Range 0-15 volts and 0-30 amperes 1.20 



METERS, CENCO DIRECT CURRENT 



PORTABLE TYPE. 



A line of dependable electrical measuring instruments at a reasonable price. They are made on the 

 D'Arsonval Galvanometer principle with a rectangular coil of wire rotating in a small annular gap be- 

 tween a core and pole pieces. This gap is traversed by a concentrated uniform field produced by a 

 powerful permanent laminated magnet. The current is carried into and out of the coil by means of non- 

 magnetic springs. The moving element is perfectly balanced between .two highly polished jewels. The 

 throw of the coil is stopped by the coil striking its support. This prevents the bending of the pointer 

 and the destroying of the calibration of the instrument. A large window directly over the moving 

 system shows all of the working parts. The meter is enclosed in a dust proof finely finished metal 

 case on a polished mahogany base. Leads are brought to three of our Cenco binding posts, which are 

 recommended for their convenient size and from the fact that their construction will not allow the 

 knurled nuts to be lost. 



Ammeters, voltmeters and volt-ammeters can be furnished in the ranges listed below. In each in- 

 strument the calibration is guaranteed to 1 per cent, of the full scale. 

 4504. AMMETERS, Cenco. 



4510. VOLTMETER, Cenco, with double scale. Ranges, 0-150 volts in 1 volt divisions and 0-7.5 volts 

 in 0.05 volt divisions 15.00 



4512. VOLT-AMMETER, Cenco, combined instrument with ranges 0-10 volts and 0-10 amperes in 0.1 unit 

 divisions 12.00 



