(Kelly of the Clue Crew gives the clue from a lab.)  Stretch a balloon over a glass, secure with rubber bands, then place a straw on top & you have a simple version of this device that measures air pressure
373 .... the nature of reality, and 
because laws allow scientists to make predictions ...... science, this book need 
not stretch over many volumes in order to give an ...... suggest that that this 
version may not actually be due to Archimedes, ...... top of the piston to increase 
the pressure.