. THE CROWN MAGNETIC STEERING WHEEL, SHOWING THE VARIOUS POSITIONS FOR THE CONTROLLING SWITCH. valves which have become so popular on car engines as the result of aero experience during the war. The springing of the car is conventional, being by semi- elliptic springs all round; and combined with the com- paratively high weight of the vehicle, some 2 J tons, ensures perfect comfort for the occupants over all types of roads. Detachable wheels and electric lighting and starting complete the equipment. And now to deal with its transmission system. Firstly, let us be quite clear that we understand
. THE CROWN MAGNETIC STEERING WHEEL, SHOWING THE VARIOUS POSITIONS FOR THE CONTROLLING SWITCH. valves which have become so popular on car engines as the result of aero experience during the war. The springing of the car is conventional, being by semi- elliptic springs all round; and combined with the com- paratively high weight of the vehicle, some 2 J tons, ensures perfect comfort for the occupants over all types of roads. Detachable wheels and electric lighting and starting complete the equipment. And now to deal with its transmission system. Firstly, let us be quite clear that we understand the working of the electric dynamo and motor. An ordin- ary dynamo used for the generation of current consists of a set of electric magnets between the pole pieces of which revolves an armature, a soft iron core wound with insulated wire. This armature is by some mechanical means revolved on its longitudinal axis between the pole pieces of the magnets, and this revolution and the consequent cutting of the lines of magnetic force from the magnets by the windings of the armature are the immediate cause of the generation of current. Other things take place, of course. There is, for instance, the building up of the current, as it is known, foras soon as the armature begins to revolve, the magnetism of the magnet is increased and armature and magnets work together to give the desired result of a high-current output. These further details, how- ever, are beside our present purpose. WTiat I want to be perfectly clear is that the generation of current depends on the revolution of the armature inside the magnets, in other words, on the difference in speed between the two components. From the purely electrical point of view it would not matter whether the armature were revolved mechanically inside the magnets or the magnets were revolved mechanically outside the armature. The same difference in speed would be present, and we should have the same result of the generation of electric
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