[GreenKeys] Telephone Hand Crank Dynamo

[WA5CAB--- via GreenKeys]

That is substantially the way that a BD-71 (6-line) or BD-72 (12-line) 
Switchboard and a bunch of EE-8's works.  Except that the operator didn't have 
to listen in in order to know when the conversation was finished.  A drop 
indicator showed when either of the EE-8's was hung up.  I think that was 
probably true of civilian sets as well.

In a message dated 06/16/2015 21:37:38 PM Central Daylight Time, 
drlegendre at gmail.com writes: 
> As I have come to understand it..
> 
> 
> In the very early days, the hand-crank magneto served only one purpose - 
> to ring a bell down at 'central' (the phone company office) - it did not 
> supply current for the voice circuit - that was done by the talk battery. In 
> those days, a local system might have only a couple dozen circuits, at the 
> most. 
> 
> When the operator heard you ring-in, they would connect your line to a 
> talk battery, with their headset (or handset) on the other end of the loop. 
> You'd then tell the operator who you wished to call, and the operator would 
> then connect the recipient's line to the operator's crank magneto - and then 
> the operator would use their mag to ring the bell on the recipient's 
> phone. In some cases, the operator would connect the two lines at that time, and 
> allow you to use your mag to ring the recipient's bell, if the distance 
> was short enough. 
> 
> Once the recipient answered, the operator would say "call from Ray Morgan" 
> (if needed) and connect the two lines together on a talk battery loop. The 
> operator would then listen-in only as needed (...) and when the 
> conversation was over, they'd re-connect all of the circuits back to the default 
> jacks. 
> 
> 
> 
> Please feel free to correct this..
> 
> 
> On Tue, Jun 16, 2015 at 7:32 PM, Roy Morgan <k1lky68 at gmail.com> wrote:
> >> 
>> On Jun 15, 2015, at 12:01 PM, Howard Weeks <weeksh at att.net> wrote:
>> 
>> >Roy,
>> >
>> >Those things will produce up to about 80 - 100 volts depending on the 
>> crank speed and condition of contacts,
>> >On 6/15/2015 11:32 AM, Roy Morgan wrote:
>> >>Greenkeyers and telephone historians,
>> >>
>> >>I have acquired a hand crank dynamo of the sort used in ole time 
>> telephones.
>> 
>> Thanks to all for information about the hand crank telephone dynamotor:
>> - 80 to 100 volts
>> - about 20 cycles
>> - rings a bell or other device at the operators place
>> - will bite you if you are careless
>> - wil bring worms up from the ground
>> 
>> It’s nice to hear from folks who remember using them (even while standing 
>> on a chair to reach the thing!)
>> 
>> Roy
>> 
>> 
>> Roy Morgan
>> k1lky68 at gmail.com
>> K1LKY Since 1958
>> 
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>> 
> 
> 
> 
> 

Robert & Susan Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480
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