The elements of dynamic electricity and magnetism (1903)
Atkinson, Philip. [from old catalog] · New York, D. Van Nostrand company · leaf 381
Fig. 119. by a funnel-shaped opening in the door, is fixed thebheet-iron diaphragm e, supported by a ,«ioft-rubber ring, THE TELEPHONE. 365 ?/?/, and the springs v v^\ v^ pressing on the ring, andV on the diaphragm itself, a piece of felt attached tothe spring v intervening at the point of contact.…
Electricity · Magnetism
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