18 Feb
2007
18 Feb
'07
5:04 p.m.
Bob Bradlee wrote:
On Sat, 17 Feb 2007 20:48:33 -0800, Brent Hilpert
wrote:
I believe they use high-voltage fluorescent in the Subway now.
Peace... Sridhar
Chuck Guzis wrote:
> coke-oven (producer) gas. For some reason never made clear to me,
> one of the competing "standards" for AC distribution was 25Hz (both
> 50 and 110v).
Didn't the 25 Hz stuff have it's origins
in turn-of-the-century
electric-train/streetcar technology? ..such established systems then being
extended into residential/industrial use in some areas. There were a few
30's-era radios made for 25Hz, distinguished by their oversize power transformers.
I remember commenting about the lightbulbs flickering in the NY subway and my dad
tellling me that the
subway operated on 25 cycle. this was close to 50 years ago. I asume it has been upgraded
by now.