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



213 



b 



No. 4671 (Vertical). 



4674. 



No. 4674 (Horizontal). 



No. 4683. 



No. 4687. 



No. 4674. 



METERS, WESTON (CONTINUED). 



METER, LECTURE TABLE, D. 0. 



GALVANO-VOLT-AMMETER. Combines six different 

 electrical measuring instruments: 



(1) Galvanometer. 



(2) Milli- Voltmeter, range 25-0-25 mv. in 1 mv. divisions. 



(3) Mil- Ammeter, range 25-0-25 ma. in 1 ma, divisions. 



(4) Voltmeter, range 5-0-5 volts in 0.2 volt divisions. 



(5) Voltmeter, range 125-0-125 volts in 5 volt divisions. 



(6) Ammeter, range 25-0-25 amperes in 1 ampere divisions. 

 The zero is in the center of the scale so that no time need 



be wasted in determining the positive terminal of a cir- 

 cuit. It is so mounted that it may be used in either of 

 THREE POSITIONS vertical, horizontal, or inclined 

 at a convenient angle. (These positions are shown in 

 the illustrations above.) The working parts are fully exposed to view and all connections may 

 readily be traced. It is an extremely sensitive instrument, and having no suspensions, mirrors 

 or adjustments to get out of order, is always ready for use. Among many uses are the following: 

 The MEASUREMENT OF VOLTAGE, AMPERAGE AND RESISTANCE OF BATTERIES; the 

 DETERMINATION OF RESISTANCE, CONDUCTIVITY, etc., of the various metals; the 

 MEASUREMENT OF THE THERMO-ELECTRIC EFFECTS of different metals; as a CUR- 

 RENT INDICATOR IN WHEATSTONE BRIDGE WORK; and as a LECTURE TABLE GAL- 

 VANOMETER $40.00 



No. 4686. 



METERS, LECTURE TABLE, D. C. 



4682. AMMETER, with zero at left of seal?, mounted vertically in a dust-proof case, for demonstration 



work. Very sensitive, and always ready for use. Range 0-1 ampere in 0.01 ampere divisions. 

 ." ." '. 27.50 



4683. EXTRA SHUNT, to make No. 4682 read to 10 amperes in 0.1 ampere divisions 5.00 



4686. VOLTMETER, same style and mounting as No. 4682. Range 0-4 volts in 0.05 volt divisions. 



" 27.50 



4687. EXTRA COIL, to make No. 4686 read from to 120 volts in 1.5 volt divisions 5.00 



