>> Hmm, ours has a spinning brush on the underside. The one time somebody 
>> run over the cable, it chewed up the insulation on it. :-/
> 
> Oh, mine doesn't have the spinny brush bit on the main unit, only at the 
> end of the pipe.

They call it a "beater bar", apparently. These's a little switch to 
deactivate it. (It's actually just a lever that pulls the drive belt 
tight or slack.)

>> Heh. Just imagine, a petrol-powered vacuum cleaner... Surely your 
>> house would end up more dirty than when you started! :-D
> 
> Nah, you just store the exhaust on-board in a canister, then dispose of 
> it once it's full.

The laws of thermodynamics seem to suggest this wouldn't work too well...

> Or have the engine part outside, and a long pipe :-)

Apparently that's how the first vacuum cleaners worked...

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