[GreenKeys] Model 28 Motor Trivia

[WA5CAB at cs.com]

TM 11-487 (10/44) contains a long table listing voltages and frequencies 
(including DC) found in various countries and major cities around the world.  25 
CPS is listed for Toronto, parts of British Columbia, Nice, the Panama Canal 
Zone and parts of China.  Also as an alternate for India but no specific 
locations given.  Part of Italy and part of their holdings in North Africa are 40 to 
45 CPS.  The rest is 50, as is most of the rest of Europe.  Gibralter is given 
as 110 VAC 76 CPS (plus 440 VDC) and Malta as 105 VAC 100 CPS.  North and 
Central America, except for parts of Canada and the Canal Zone is 60.  Guam, the 
P.I. and the Society Islands listed as 60 CPS, Samoa and most of S.E. Asia 
(French Indochina) as 50.  But no 25 CPS listings for the Pacific.

As I dimly recall, the Canal was being built just as DC distribution systems 
were beginning to fall from favor and ended up 25 CPS.  Electrification in the 
Pacific came later and must have gone 50 or 60 depending upon who was doing 
the work (Americans or Europeans).

I've been missing a lot of mail lately from Al's lists so I didn't see the 
original post.  But it probably had nothing to do with M28 motors, as I can't 
think of any reason any 25 CPS ones would ever have been built.  Unless the 
Canal Zone didn't convert until later in the 50's.  Could have happened.

In a message dated 7/2/2004 10:04:46 PM Central Daylight Time, 
sekelya at ameritech.net writes: 
> as I recall it back in the days of WWII the pacific had Island power 
> systems that were 25 cycles  who knows how long those power plants were still in 
> operation...

Robert Downs - Houston
<http://www.wa5cab.com> (Web Store)
<wa5cab at cs.com> (Primary email)
<wa5cab at houston.rr.com> (Backup email)