[GreenKeys] Telephone Hand Crank Dynamo

[Roy Morgan]

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