Telephone earpiece and mouthpiece, diagram. Speaking into the mouthpiece of a telephone produces mechanical variations in the carbon microphone, which alters its resistance. This varies the electric current which is transmitted to the earpiece of another telephone. The varying current passes round the coils of an electromagnet, which attracts an iron disc. The movements of the iron disc create sound waves.
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Details
Creative#:
TOP26153153
Source:
達志影像
Authorization Type:
RM
Release Information:
須由TPG 完整授權
Model Release:
N/A
Property Release:
N/A
Right to Privacy:
No
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