An induction coil or "spark coil" is a type of electrical transformer used to produce high-voltage pulses from a low-voltage direct current (DC) supply. To create the flux changes necessary to induce voltage in the secondary coil, the direct current in the primary coil is repeatedly interrupted by a vibrating mechanical contact called an interrupter.
A Wehnelt cylinder is an electrode in the electron gun assembly of some thermionic devices, used for focusing and control of the electron beam. It is named after Arthur Rudolph Berthold Wehnelt, a German physicist, who invented it during the years 1902 and 1903.
Anthony Joseph Giacalone , also known as Tony Jack, was an American organized crime figure in Detroit, serving as a capo in the Detroit Partnership. He came to public notice during the 1970s investigations into the disappearance of Jimmy Hoffa, as he was one of two Mafia members – the other being Anthony Provenzano – that Hoffa had arranged to meet on the day he disappeared.
Giacalone is a surname.