CO2 Rotator (1N22.33)
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A CO2 cartridge is inserted in a cylinder at the end of a rotation arm. When the end of the cartridge is punctured, the escaping gas spins the arm in a circle. This can also be used for pressure/temperature discussions because the cartridge will be quite cold after use.
Use the spring loaded pin (not shown above) to puncture the gas cartridge. You can gently hold a finger against the orange cylinder to keep it place while firing.