Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 490
I Fig. 3.—Bells modified telephone receiver (section). This receiver consists, as shown, of an electro-magnet M, oppositethe poles of which is a tightly-stretched membrane which closes a Dec., 1884.] Glimpses of the Electrical Exhibition. 46S mouth-piece T. A piece of watch spring in the form of a… … Fk;. i.—Bells modified receiver (elevation). Continuing his experiments as to the most favorable conditions forthe proper working of his telephone, Bell made numerous experimentsas to the influence produced by variations in the size of the differentparts. Among other things, he gradually increased…
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