Derrek takes us back to school science with a hand vacuum pump and bell-jar ... The vaccum pump is very interesting as it is a manual pump that creates a very interesting sound. These vacuum pumps were used extensively in early laboratories developing Electric Light Bulbs, Cathode Ray Tubes, Vacuum Tubes, TVs, Radio Amplifier Valves. Also used for chemical and medical research as well as demonstrations in many school science labs. The POWER of VACUUM.
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