Re: hand crank coil for demos

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <Parpp807-at-aol-dot-com>

In a message dated 4/9/02 10:32:40 PM Central Daylight Time, tesla-at-pupman-dot-com 
writes:

> I would expect frequency to be in 20 Hz area.

Hi Jim,

B4 Terry kill this topic, what do you know about the pea whistles? I
have a wartime whistle that uses a pea. The frequency is around 
400 cps and it was used to modulate the 48 V bias voltage so you
could "ring thru" to ring the other phone. Sort of a sub-cycle ringer.
I don't know why it would be needed because the EE-8 field phones
have the built-in magneto.

Terry: just one more on this topic.  :-)))*

Happy day,
Ralph Zekelman

>>*OK, Ralph uses up one and last favor ;-)) but if really OT, tell only
Ralph at Parpp807-at-aol-dot-com<<