[GreenKeys] Switch polarity

[Richard Knoppow]

    I don't know but was surprised when looking at British rail films on 
You Tube to find the engineer (engine driver in Brit) sits on the left 
side where in the U.S. they sit on the right. So in England cars have 
the steering wheel on the right and engine drivers sit on the right and 
in the U.S. cars have their steering wheels on the left and locomotive 
engineers sit on the right. I am not sure the throttles of steam 
locomotives work in the same direction.
    I am also not sure if in the dim distant past switches in aircraft 
were pushed down for on and up for off causing confusion because 
household switches were the other way.

On 5/27/2017 8:33 PM, drlegendre . wrote:
> Pretty sure that "up for off" convention is a result of the 
> Commonwealth.. IIRC, many of the 3-pin Euro mains plugs expect the 3rd 
> terminal to be up vs. down as in American systems.
> 
> The one that always gets me, is the reverse standard for valving on 
> locomotives. In most any case, a ball valve is open when the lever is 
> parallel to the line (makes sense). But I was told this is the direct 
> opposite of the railways, where the valve is open when the lever is 
> perpendicular to the line.
> 
> Confirm, deny, excoriate?


-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL