In a June 23, 1910 notarized letter that was published in a catalog produced by the Electro Importing Company of New York, Herrold reported that, using one of that company's spark coils, he had successfully broadcast " wireless phone concerts to local amateur wireless men ".
12.
After noticing that the high-voltage spark coils used to excite X-ray tubes were becoming popular as transmitters for radio amateurs, he joined two other employees in 1906 to start the Clapp, Eddy, and Eastham Company ( subsequently Clapp-Eastham ) in Boston, to sell spark coils, variable capacitors, and other radio devices.
13.
After noticing that the high-voltage spark coils used to excite X-ray tubes were becoming popular as transmitters for radio amateurs, he joined two other employees in 1906 to start the Clapp, Eddy, and Eastham Company ( subsequently Clapp-Eastham ) in Boston, to sell spark coils, variable capacitors, and other radio devices.
14.
The Model T ( built into the flywheel ) differed from modern implementations by not providing high voltage directly at the output; the maximum voltage produced was about 30 volts, and therefore also had to be run through the spark coil to provide high enough voltage for ignition, as described above, although the coil would not " buzz " continuously in this case, only going through one cycle per spark.
15.
For example, in December 1916 " QST " magazine, an amateur operator working on long distance message passing describes one way to avoid interference was to send messages " . . . on Thursday nights, when the children and spark coil'hams'are tucked up in bed " ( a spark coil was an unsophisticated radio transmitter, made from an automobile ignition coil, that produced noisy interference ).
16.
For example, in December 1916 " QST " magazine, an amateur operator working on long distance message passing describes one way to avoid interference was to send messages " . . . on Thursday nights, when the children and spark coil'hams'are tucked up in bed " ( a spark coil was an unsophisticated radio transmitter, made from an automobile ignition coil, that produced noisy interference ).
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