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| | Cylinder Record History |
 | | To make a record artist sang into the horn of a Phonograph, the sound waves were concentrated onto a glass diaphragm, which viabrated a jeweled cutter, that engraved a hill and dale groove into the surface of the record. |
 | | The masters were improved, recorders improved, and so a "perfect" master was made, this original cylinder was placed in a bell jar, and gold was vaporized onto it, and made the record conductive. |
 | | The machines are Class M electrical phonographs (note the batteries on the floor) You can see the stacks of blanks to the side of the recording machines, for replenishing for the next set of records. |
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