Oil Can to Oil Can Transmission

201

00:31:20

Two farmers with no telephone service and a small river between their farms used this stretched wire device.

Two oil cans with hole drilled in bottom center of both cans big enough to let wire through.  Knot end of wire to keep inside cans and stretch wire tight with can holders ( gripping sides of can not at bottom)  at both ends.  Shown in drawing mounted to side of house by window so you could raise window sill  and lean outside of house to talk into or listen to open end of can. Or mounted on secure table able to hold can with wire tight.  Nothing should contact wire between can connections.

To attract neighbor's attention to talk, ring bell or cow bell in your can's end.

Range can reach up to 300 yards.  I suggest a radio played into one can at your speaking  level and fine tune tension at other end for best sound level and transmission.

published 10 years ago

loliaffe

10 years ago

Lol

Karsten

10 years ago

That has nothing to do with electronics

thebugger

10 years ago

The old paper cup telephone. Used to do it as a kid. The sound waves travel through the thread to the other side. The same applies for electronic phones, the difference is that the carrier is not acoustic waves, but electrical waves. The only difference is the medium. As everything, though, there's attenuation. Sounds attenuates mechanically, and electricity attenuates from wire resistance. The only difference is that with electricity you can counteract attenuation with amplification, and acoustical waves cannot be amplified directly.

lmccoig

10 years ago

One wire two way and radio volume to fine tune wire tension would fall in Every Circuit class without electron flow.

thebugger

10 years ago

The connection cannot be duplex, simultaneously, because the two sound waves will interact will each other in the two directions and cancel out. That's probably one of the differences between acoustical waves and electrical waves. You can modulate the two signals at different carrier frequencies occupying the same medium without interfering with each other. There are many other techniques of modulation, but they all have common purpose. For a lot of signals to occupy the same medium without interfering with each other.

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