[GreenKeys] 14-15-19 Etc. motor

[Bruce Gentry]

A frequency change in the Los Angeles area took place in the 1930s, and 
provided many short term jobs for the unemployed.  Each person was 
trained to convert a few models of clocks, and once the work was done, 
they were allowed to keep their tools. I think the utilities paid them, 
state laws usually require utilities to modify or replace equipment if a 
frequency change or elimination of DC occurs.  I wonder if Hoover Dam 
had an effect on the frequency change?  We had 25 and 60 cycles here in 
Syracuse, as well as DC until 1953. There were many electric clocks here 
that used a universal motor to wind a balance wheel movement, as well as 
phonograph turntables with universal motors and mechanical governors. I 
can't see why a governed series motor in a Teletype couldn't run on 25 
cycles, does anyone know of it being done?

        Bruce Gentry, KA2IVY


On 7/5/18 4:44 PM, Richard Knoppow wrote:
> Made a big market for electric clocks.
>
> On 7/5/2018 12:46 PM, Jim Haynes wrote:
>> It's really quite simple.  The 50 Hz motor will turn at 1800 rpm when
>> powered by 60 Hz.  The only difference in the motors is the extra iron
>> ne