Ever wanted to make a model of a carburettor? me neither, but anyway, using a toilet roll and some other bits of cardboard you can roll it up to made a demonstration of how the venturi effect works in the carbie.
use the toilet roll and put a squire through each end.
then make a valve like thing so they can open and close,
take them out then put a smaller pipe in the center of the roll,
that will show sort of what the inside of a carbie looks like for a teacher or what ever.
here ill find a video and post it if you dont know how the carbie works and the venturi effect.
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