Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 58
eral separately magnetized bars, but with generally inferiorresults, owing to its weaker and less permanent magnetic field. In many forms of receiving instruments much trouble is experi-enced in keeping permanent the adjustment between the magnetand the diaphragm. This is often due to flimsy… … FIG. 23.-I;ELL single-pole REfcEI\ER. rigidly secured to the shell only at a point at considerable distancefrom the diaphragm, the unequal expansion, or contraction of themagnet and the shell causes the distance between the pole-pieceand the diaphragm to vary with every change in temperature.…
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