[GreenKeys] TTY Ribbons

[Bruce Gentry]

Bruce Gentry wrote:
> Larry Tighe wrote:
>> Purple ribbons were less likely to be taken
>> home at used in typewriters
>> ---------------------------------------------------------------------
>> That's brilliant....never thought of that.  Kinda like the New York 
>> City subway system....I'm told the old, dim and flickering (20 cycles 
>> system) light bulbs were left hand threads to prevent theft.
>>
>> lar
>> ----- Original Message ----- From: "AA8K73 GMail" <aa8k73 at gmail.com>
>>
>>
>>   
> The subway AC distribution was 25 cycles, and the bulbs did flicker 
> quite noticably. They were indeed left hand thread, and in groups of 5 
> wired in series for 600 volts. If the AC power failed, the station 
> master could switch them to take service from the third rail at 600 
> volts DC.  I think all of them are gone now, but they were there in 1992.
>
>     Bruce Gentry
>