. The Street railway journal . DETAIL VIEW SHOWING ADJUSTINGWEIGHTS TYPE K AMMETER IN CASE simplicity of their construction. There are but few parts, noneof which are complicated, and the adjustments are easily effect, the mechanism consists of a stationary coil, throughwhich the measured current flows, the voltmeter measuring the. SIDE VIEW OF COAL CAR USED BY THE ATLANTIC SHORE LINERAILWAY COMPANY current which flows through a high resistance. The coil actson a movable core or plunger, which is connected with a steelbeam mounted upon knife bearings and carrying the indicatingpointer.
. The Street railway journal . DETAIL VIEW SHOWING ADJUSTINGWEIGHTS TYPE K AMMETER IN CASE simplicity of their construction. There are but few parts, noneof which are complicated, and the adjustments are easily effect, the mechanism consists of a stationary coil, throughwhich the measured current flows, the voltmeter measuring the. SIDE VIEW OF COAL CAR USED BY THE ATLANTIC SHORE LINERAILWAY COMPANY current which flows through a high resistance. The coil actson a movable core or plunger, which is connected with a steelbeam mounted upon knife bearings and carrying the indicatingpointer. There are no springs, the action being controlled bygravity. In other instruments in which a solenoid is employed, theresidual magnetism has seriously affected their accuracy. Inthe type K the core is so constructed that it is saturated with avery small amount of magnetic energy, such as that of one-twentieth full scale deflection, and thus for any load the at- February ii, STREET RAILWAY JOURNAL. 289 traction upon the plunger is directly proportional to the cur-rent, making the error due to residual magnetism commerciallynegligible and the scale almost uniform, commencing with alternating currents its action is not appreciably affectedby changes in frequency. External fields do not influence theperformance and temp
Size: 2253px × 1109px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
