Automobile Engineering: A General Reference Work, Volume 3

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American Technical Society, 1920 - Automobiles
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Page 1 - ... editors have freely consulted the standard technical literature of America and Europe in the preparation of these volumes. They desire to express their indebtedness particularly to the following' eminent authorities whose well-known works should be in the library of everyone connected with building.
Page 382 - This should be done only after the preceding tests have been made, as an open-circuited coil might cause the .1-volt scale of the voltmeter to burn out if this test were made first. The armature is connected as indicated in(l) above, but for this test the .1 -volt scale instead of the 3-volt scale of the voltmeter is used, Fig- 268.
Page 327 - Delco systems installed on 1915 and subsequent cars, different models of the same make and the same year having different systems, so that instructions for their maintenance depend upon the system employed. Third-Brush Method. As the voltage generated varies directly with the speed, it is evident that to maintain a nearly constant voltage with a variable speed, it becomes necessary to decrease the magnetic field as the speed increases. Since the magnetic field of the generator is produced by the...
Page 328 - The full voltage of the generator is obtained from the brushes C and D. When the magnetic field from the pole pieces N and S is not disturbed by any other influence, each coil is generating uniformly as it passes under the pole pieces; the voltage from one commutator bar to the next is practically uniform all around the commutator. Therefore, the voltage from brush C to brush E is about 5 volts, when the total voltage between the main brushes C and D is 6-J- volts and current at 5 volts' pressure...
Page 1 - AUGUSTUS TREADWELL, JR., EE Associate Member, American Institute of Electrical Engineers Author of "The Storage Battery: A Practical Treatise on the Construction. Theory, and Use of Secondary Batteries" Authorities Consulted — Continued THOMAS H.
Page 362 - ... volts. To check this a voltmeter should be connected across the terminals, noting the reading at the point that the contacts close. It is designed to break the circuit when the discharge current is less than 1 ampere, preferably as close to the zero mark as possible to reduce the arc on breaking the contacts. This can be checked by placing an ammeter in the circuit in series with the current coil of the cutout, noting the value of the current at the moment that the contacts separate. When properly...
Page 352 - ... operating as a motor, its resistance is sufficiently high to cut this discharge from the battery to negligible proportions. As soon as the engine starts, the generator is driven in the opposite direction, and its voltage immediately overcomes that of the battery, and the battery begins to charge. The face of the starting switch and the details of the connections on its reverse are shown in Fig. 256. Delco Instructions General Instructions. If the starter, lights, and horn all fail, the trouble...
Page 328 - ... to flow in the shunt field winding. As the speed of the generator is increased the voltage increases, causing the current to be charged to the storage battery. This charging current flows through the armature winding, producing a magnetic effect in the direction of the arrow B. This magnetic effect acts upon the main magnetic field which is in the direction of the arrow A, with the result that the magnetic field is twisted out of its original position in very much the same manner as two streams...
Page 112 - These contacts should be so adjusted that when the fiber block B is on top of one of the lobes of the cam the contacts are opened the thickness of the gauge on the distributor wrench. Adjust contacts by turning contact screw C and lock with nut N. The contacts should be dressed with fine emery cloth so that they meet squarely across the entire face. The...
Page 121 - Fig. 137, on the contacts C. Slight adjustment of the air gap / may be made, but in no event should the distance between the contacts C be increased very much over the value menFig. 137. Method of "Crowning" the Spring, Delco Ignition Relay tioned above.

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