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2. History of the Tesla coil - Wikipedia

   en.wikipedia.org/wiki/History_of_the_Tesla_coil

   These vacuum electrodes were later manufactured with handheld Tesla coils to make "violet ray" wands, sold to the public as a quack home medical device. [ 125 ] [ 126 ] The popularity of electrotherapy peaked after World War I , [ 111 ] [ 123 ] but by the 1920s authorities began to crack down on fraudulent medical treatments, and electrotherapy ...

3. Tesla coil - Wikipedia

   en.wikipedia.org/wiki/Tesla_coil

   Scientists working with high-vacuum systems test for the presence of tiny pin holes in the apparatus (especially a newly blown piece of glassware) using high-voltage discharges produced by a small handheld Tesla coil. When the system is evacuated the high-voltage electrode of the coil is played over the outside of the apparatus.

4. Teleforce - Wikipedia

   en.wikipedia.org/wiki/Teleforce

   Teleforce was mentioned publicly in the New York Sun and The New York Times on July 11, 1934. [9] [10] The press called it a "peace ray" or death ray.[11] [12] The idea of a "death ray" was a misunderstanding in regard to Tesla's term when he referred to his invention as a "death beam" so Tesla went on to explain that "this invention of mine does not contemplate the use of any so-called 'death ...

5. List of vacuum cleaners - Wikipedia

   en.wikipedia.org/wiki/List_of_vacuum_cleaners

   This is a list of vacuum cleaners and robot vacuum cleaner manufacturers. A vacuum cleaner is a device that uses an air pump to create a partial vacuum to suck up dust and dirt, usually from floors, and optionally from other surfaces as well. The dirt is gathered by either a dustbag or a rigid cartridge, which may be emptied and reused.

6. The 7 Best Handheld Vacuums for Small Spaces - AOL

   www.aol.com/lifestyle/7-best-handheld-vacuums...

   These 7 small-but-mighty vacuums from brands like Dyson, Hoover, and Black+Decker making cleaning small spaces easy.

7. Oudin coil - Wikipedia

   en.wikipedia.org/wiki/Oudin_coil

   Oudin coil used for medical electrotherapy, 1907, and a schematic diagram of its circuit (left).. An Oudin coil, also called an Oudin oscillator or Oudin resonator, is a resonant transformer circuit that generates very high voltage, high frequency alternating current (AC) electricity at low current levels, [1] [2] [3] used in the obsolete forms of electrotherapy around the turn of the 20th ...