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MANAGERS AND PROJECTIONISTS 1111
the movement of the armature will of necessity be very slight, it nevertheless will affect magnetic changes just as accurately as though it were measured in inches instead of thousandths of an inch.
This device is really, to give it its correct title, an Electro-Magnetic reproducer. The E M F it generates is almost too weak to understand, but, thanks to our modern methods of amplification, its strength may be multiplied until it will give almost any desired volume at the horns.
Of course the foregoing only sets forth the operating principle of the electro-magnetic pick-up. There are many details of construction which must be given very careful attention if a reproducer is to be built which will be reliable, sufficiently rugged to withstand such abuses as come to all equipment put out into actual operation and often placed in the hands of men who do not understand such things or their handling as well as they might, and which will, besides that, give satisfactory results at the horns in the matter of volume, tone quality and almost immeasurably minute variations which go to make up, for example, an orchestral performance.
In this device the magnet pole pieces are especially designed to concentrate the magnetic force upon the tiny armature in just the right way. The pivot connected with the magnet armature and the reproducer diaphragm is and must be so designed that there is absolutely no lost motion, and at the same time no binding. However, it is necessary that there be a certain amount of stiffness or friction to prevent any unnecessary wobbling.
In its original design the Western Electric reproducer, the construction wras substantiallv as we have described.