Ballard, William Cyrus, Jr · New York [etc.] McGraw-Hill company, inc. · leaf 124
r waves orthat air bears to sound waves. Waves set up by mechanical means are quite similar inmany respects to those set up electrically, so a brief dis-cussion of a mechanical case may be an aid to the under-standing of the electrical one. Suppose we set up a wave inwater by poking a stick up and…
Radio
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