The position of the motors with reference to the truck and automotive wheels could be very effectively shown in Fig. 20, and also the way during which they're held in place. Experience has proved that the 58-passenger-28 inside and 30 outside-double-deck car mounted on a four-wheeled truck is the kind of rolling inventory best suited for British circumstances. There can also be hazard of a passenger being struck by the axle-bins of the rear bogie truck when leaving the automobile. The way in which the motors are suspended from the truck will not be the same in this determine as in these beforehand shown, but that is just because the machines are usually not made by the identical concern, and every manufacturer has his own design. This fact is taken advantage of in regulating the speed of the automotive, and controlling switches organized so as to direct the current by way of the motors in this manner are designated as belonging to the series parallel kind, the name being given from the truth that when the car is operating gradual, the current passes by way of the 2 motors in collection-that is, via one after the other; however when the motors are operating quick, a separate current passes by means of every machine.

The question of gearing is complicated by the truth that the frame of the automobile oscillates vertically with respect to the axles. The power with which the motors turn the car wheels around depends upon the strength of the current; that is owing to the fact that the magnetic pressure is increased or decreased by variations in the current strength. The security fuse is just a chunk of wire of such size that will probably be melted by a current that the motors can carry with out being injured; therefore when the present power reaches some extent the place the safety of the apparatus is endangered the fuse melts and thus breaks the circuit and stops the further stream of present. An electric current in passing by means of a wire generates heat, and the stronger the current the greater the heat. As was defined in the first article, an electric motor will be made to act as a generator of electric present by merely reversing the direction wherein the armature revolves.

When a car is supplied with magnetic brakes, the controlling switches are so made that when the handle h is moved again to the cease position it disconnects the motors from the trolley wire and at the identical time connects them with the magnetic brakes in such a manner that they are going to act as generators and thus send present by way of the coils of the latter. It is clear that the path of a car motor cannot be reversed at the instant that it's desired to have it act as a generator-that is, when it's desired to place the brakes on; therefore the route of the present via the armature is reversed. From the final hood switch, h, the wire is run down one nook of the automotive physique, being both inside the car body, or, if not, so coated by moldings as to not be reached by the arms of passengers. If a subscriber in a single metropolis needs to speak with a subscriber in a neighboring metropolis, each cities will need to have metallic-circuit techniques and metallic circuits between the 2 cities. A grooved rail is, nonetheless, far much less of a nuisance to the peculiar vehicular traffic, and it has come to be largely used within the principal cities of America.

In nearly all of the massive cities the question is now being requested, Why can not all of these wires be buried together with the gas and water pipes under the streets? When the controlling swap is provided with only one handle that is turned in a single route to run the car forward, and in the other direction to run it backward, the graduations in velocity being obtained by placing the handle in positions intermediate between the cease position and the highest pace position. The covers of the openings via which access to the commutator brushes is obtained are removed from both motors, and within the forward one the highest of the commutator and one of many brushes can be readily seen. 18 and 19. It will be noticed that there are two upright shafts, the ends of which venture above the top of the field. For a day or two all went well; over 200 miles of cable ran smoothly out of every vessel, and the anxious chiefs began to indulge in hopes of final success, what is electric cable when the cable broke about twenty feet behind the stern of the Agamemnon.