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July, 1924
PICTURED LIFE FOR HOME, SCHOOL AND COMMUNITY
193
THE SINGLE UNIT STARTING AND GENERATING SYSTEM
The Juice That Lights the Gas
Finally the part played by Electricity in the development and perfection of the Automobile is featured. This is first shown symbolically by effecting a transformation of the old-time stage coach into an up-to-date motor car by means of electricity drawn from Benjamin Franklin's kite string. The transformation is taken care of by two gnomes who slide down the kite string with the lightning and apply their sparks to the coach. These gnomes, who re-appear many times as the picture progresses, are depicted with bodies that represent the North East trade-mark, and this by the way is virtually all the "advertising" contained in the film.
The rest of the first subject is devoted to a diagrammatic explanation of what makes up the electrical system and the part that each electrical unit plays in the operation of the car. The gnomes install the units one by one, and then in a series of "semi close-up" views demonstrate how the system operates. This demonstration is made very graphic through the use of moving lines or "slugs" which travel along the wires to represent the flow of the electric current.
The second subject, covering the Generator and the Starting Motor,
goes considerably into the details of the make-up of these units and especially their mode of operation.
Animated Lines
The elementary principles of electricity and magnetism as applied to the generator and the motor are thoroughly illustrated by means of diagrammatic representations of permanent magnets, moving coils and rotating armatures. In all these diagrams the magnetism is representated by animated lines of force, and the electric current by
moving streams of dots or "slugs." Following the demonstration of these elementary principles, the outstanding features which are special in automotive equipment are explained. The control of the Generator out-put particularly by 3rd brush regulation has been covered in full detail. Also the function of the generator field fuse is very clearly demonstrated.
Likewise with the Starting Motor the most generally used types of gear shifting devices, such as the Bendix Drive and the Ratchet and Pawl Clutch, are demonstrated in a manner that makes their operation easy for everybody to understand.
The Starters
Finally the various types of Generators and Starting Motors are shown in actual operation on automobiles, buses, motor boats, taxicabs, trucks, tractors and the like, in a manner that serves to point out the part that they play in the automotive world.
The third subject deals with the Single Unit Starter-Generator and shows how the functions of generating and starting can both be combined in a single machine. The circuits in this combination machine are thoroughly illustrated and all the various points peculiar to this type of equipment are pointed
{Continued on page 214)
THE IGNITION SPARK COIL