This instrument allowed water to be heated to a temperature higher than boiling point at atmospheric pressure, resulting in considerably high pressure inside. Papin designed a model of a digester in 1680 that allowed a piston inside a cylinder to...
A hydrometer measures the specific gravity of a liquid relative to water. Nicolson's hydrometer differs from other hydrometers in being totally submerged in use.
In this demonstration apparatus, water pours into the top section of the central rotor, pivoting freely about its axis. The two pipes projecting from the bottomof the rotor are closed at the end but with a rearward-facing hole. The rotor spins as...
"This unique piece of apparatus uses Lissajous figures to show that the ratio of the frequency ratios in a diatonic scale are ratios of small numbers. On the side is an air-driven vibrating reed with a small mirror attached to its free end....
