Heating the Engine by Eddy Currents
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OMETEIING new in engine pre-heating devices has recently been introduced by Ruribaken Electrical Products, Ltd., 7 1-73a, Oxford Road, Manchester.
The device itself consists of an electro-magnet having a laminated core which is wound for a voltage Supply of 200-250 volts a.c.
The functioning of the heater is simple. It is placed on the cylinder block, the current switched on and the eddy currents generated in the cylinder block, as a result'of using alternating current, heats up the metal. The magnet itself does not heat up, awing to its laminated core.
Current consumption is given as 250-350 watts. It will be appreciated that, as the heat is actually generated in the metal of the engine, there are no heat losses other than those by radiation from the block,' The electromagnet can be 'kept in position, without anxiety, and so the engine can he maintained at a comfortable temperature to ensure ready starting, irrespective of weather conditions. The price is £3 15s.,