Thomas de Groot schrieb:
> Hey Christoph, you made my day!  :-)  I never knew about blind wheels and... 
> never noticed them of course.

You bet I didn't either, before this! :-)

Had I not happened to come across this term by chance, I would have 
considered it an oversight in the blueprints myself.


There's an /awful/ lot to learn about steam locomotives... you'd think 
they're just boilers on wheels, with some steam cylinders? Well, 
basically you're right... /very/ basically :-P

Did you know, for instance, how they get fresh water into the boiler 
while "under steam"? I mean, they can't just open a lid and pour water 
in, can they?

Even more astonishing is the fact that the device they use to accomplish 
this has /zero/ moving parts. And to top it off, the device essentially 
works by using the boiler's steam /pressure/ to have the fresh water 
/sucked/ in.

Huh? Duh!

Perfectly black thermodynamics magic, as far as I'm concerned, but 
Wikipedia claims it actually works:

http://en.wikipedia.org/wiki/Injector

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