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2. Block heater - Wikipedia

   en.wikipedia.org/wiki/Block_heater

   Some cars are produced with block heaters from the factory, while others are fitted with block heaters as an aftermarket add-on. [3] The most common type of block heater is an electric heating element in the engine block , which is connected through a power cord often routed through the vehicle's grille.

3. Ignition system - Wikipedia

   en.wikipedia.org/wiki/Ignition_system

   As batteries became more common in cars (due to the increased usage of electric starter motors), magneto systems were replaced by systems using an induction coil.The 1886 Benz Patent-Motorwagen and the 1908 Ford Model T used a trembler coil ignition system, whereby the trembler interrupted the current through the coil and caused a rapid series of sparks during each firing.

4. Ignition magneto - Wikipedia

   en.wikipedia.org/wiki/Ignition_magneto

   An ignition magneto (also called a high-tension magneto) is an older type of ignition system used in spark-ignition engines (such as petrol engines). It uses a magneto and a transformer to make pulses of high voltage for the spark plugs. The older term "high-tension" means "high-voltage". [1]

5. Andrew Freeman (inventor) - Wikipedia

   en.wikipedia.org/wiki/Andrew_Freeman_(inventor)

   Andrew Freeman (March 10, 1909 – January 17, 1996) was an American electrical engineer and the inventor of the electric block heater for automobiles. [1] Andrew L. Freeman was born in Upham, North Dakota. He attended the University of North Dakota in Grand Forks, North Dakota, where he majored in electrical engineering.

6. Earth inductor compass - Wikipedia

   en.wikipedia.org/wiki/Earth_inductor_compass

   The anemometer of the earth inductor compass on the Spirit of St. Louis shows as a small "T" shape above the fuselage behind the wing. The Earth inductor compass (or simply induction compass [1]) is a compass that determines directions using the principle of electromagnetic induction, with the Earth's magnetic field acting as the induction field for an electric generator. [2]

7. Core plug - Wikipedia

   en.wikipedia.org/wiki/Core_plug

   Core plugs can also sometimes prevent freeze damage to the motor. During the early stages of the freezing of the engine coolant a freeze plug will sometimes burst or pop out, and thus allow the coolant to exit the engine, before it might expand within the engine during the freezing process and potentially crack the engine block. [2]