Stephen Knowlton's Comments
Hammer it into a dock to tie your boat up to...
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Well, technically a Rotary spark-gap transmitter.
http://oak.cats.ohiou.edu/~postr/MRT/Tour1.htm
http://oak.cats.ohiou.edu/~postr/MRT/Tour1.htm
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stop gap transmitter... as seen on "the colony", Discovery Channel
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Hammer it into a dock to tie your boat up to...