[GreenKeys] Telephone Hand Crank Dynamo

[Lester Veenstra]

~ 90 VAC ~20HZ
Enough to drive earthworms to the surface
Enough to make you wish you had not held the line terminals


Lester B Veenstra  MØYCM K1YCM W8YCM
lester at veenstras.com

US Postal Address:
5 Shrine Club Drive
HC84 Box 89C
Keyser WV 26726
GPS: 39.336826 N  78.982287 W (Google)
GPS: 39.33682 N  78.9823741 W (GPSDO)


Telephones:
Home:                     +1-304-289-6057
US cell                    +1-304-790-9192 
UK cell                    +44-(0)7849-248-749 
Guam Cell:              +1-671-929-8141
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-----Original Message-----
From: GreenKeys [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of Roy
Morgan
Sent: Monday, June 15, 2015 11:33 AM
To: greenkeys at mailman.qth.net
Subject: [GreenKeys] Telephone Hand Crank Dynamo

Greenkeyers and telephone historians,

I have acquired a hand crank dynamo of the sort used in ole time telephones.
It has a group of U-shaped magnets, a hand crank driving the armature though
two gears.  The thing is in pretty good shape although it has some rust.  I
suspect that a few drops of oil would get it running nicely.  I remember
movie scenes where the actor picks up the ear piece, turns the crank, and
waits for the operator to come on the line.

Do folks have any internet resources or links about these things? 

Any ideas on the expected output voltage, or normal load “down the line”.

Roy


Roy Morgan
k1lky68 at gmail.com
K1LKY Since 1958

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