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CURRENT RECTIFICATION 299
Magnetic Density
The number of lines of magnetic force passing through a magnetic field per unit area of cross section. Every magnetic Held has greater density near the poles
of the magnet, dropping off rapidly as the distance from the poles is increased.
Magnetic Field
Any space through which magnetic lines of force pass. It is a term particularly applied to the space immediately surrounding the poles of a magnet. The phase is strongest near the poles, decreasing rapidly with distance and finally fading out entirely.
Magnetic Flux
Average density of a magnetic field per unit area multiplied by its area. It is really the total strength of a magnetic field or magnetic density.
Parallel Connection
(73) Two or more generators of equal voltage so connected that the positive of all connect to one positive conductor and the negative of all to one negative. The result is a voltage equal to the voltage of any one of the machines, but a current flow (amperage ) equal to the combined output of them all.
Period
The time required to perform a complete cycle of periodic motion or action.
Polyphase Current
i 74) This is represented by two or more alternatingcurrents of like period, joined to operate as a single power supply with fixed spacing of their phase. Such currents usually are produced by separate sets of coils wound upon the armature of an a. c. generator, each coil a little in advance of the other. Also such currents may be produced by one or more single-phase alternators