Testing an audio system. The thresholds of loudness and high frequency are being tested by projecting progressive plane sound waves at a listener. Progressive plane waves travel from one location to another as a series of parallel waves, allowing some sounds to be clearly heard from a distance. Photographed at the National Physical Laboratory, Teddington, UK, in 1954.
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Details
Creative#:
TOP03229232
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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