How does a non-inkjet photocopier copy?

[Saturlight]

I'm taking about the old type ones that you scan pages in at the library for 5p each. Thanks.

 

[PoloMint]

This kind?

http://home.howstuffworks.com/photocopier.htm

 

[pgh13]

Or do you mean the thermal type which use that 'orrible shiny paper that goes black when heated?
http://en.wikipedia.org/wiki/Thermal_printer

 

[Saturlight]

Thanks.