Hawkins Electrical Guide ...: Questions, Answers & Illustrations; a Progressive Course of Study for Engineers, Electricians, Students and Those Desiring to Acquire a Working Knowledge of Electricity and Its Applications; a Practical Treatise, Volume 1

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T. Audel & Company, 1917 - Electrical engineering - 3367 pages
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Page 2-742 - The flow of the current is proportional to the voltage and inversely proportional to the resistance. The latter depends upon the material, length and diameter of the conductor. Since the current will always flow along the path of least resistance, it must be so guarded that there will be no leakage. Hence, to prevent leakage, wires are insulated, that is, covered by wrapping them with cotton, silk thread, or other insulating material. If the insulation be not effective, the current may leak, and...
Page 2-699 - Fortunately, however, it has been found possible to eliminate this effect almost completely by combining into one lens a convex lens of crown glass and a concave lens of flint glass (Fig.
Page 2-677 - When a luminous ray meets a polished surface it is reflected according to two laws: 1. The angle of reflection is equal to the angle of incidence. 2. The incident and the reflected ray are both in the same plane, which is perpendicular to the reflecting surface.
Page 2-742 - ... materials. If the insulation be not effective, the current may leak, and so return to the source without doing its work. This is known as a short circuit. The conductor which receives the current from the source is called the lead and the one by which it flows back, the return. When wires are used for both lead and return, it is called a metallic circuit; when the metal of the engine is used for the return, it is called a grounded circuit, the term originating in telegraphy, where the earth is...
Page 2-606 - supported at one corner of ita frame by the adjustable link (A) in suoh a manner that it is free to swing toward or away from the driving axle. The suspending link is so placed that the belt draws the dynamo out of the diagonal position in which it would naturally hang, thus putting a definite tension on the belt just sufficient to absorb the power required. It is obvious that when the pull on the belt exceeds that due to the offset suspension of the dynamo that the dynamo will be drawn toward the...
Page 2-820 - ... of voltage at the brushes. The effect of controlling the bucking coil by the current output is to produce an approximately constant current at the higher speeds. The voltage is determined by the storage battery, and is simply the voltage required to force the specified current against the reverse pressure, plus the small internal resistance of the battery.
Page 2-800 - Knocking in the Cylinder. The form of unusual noise commonly described as "knocking" consists of a regular and continuous tapping in the cylinder, which is so unlike any sound usual and normal to operation that, once heard, it cannot be mistaken.
Page 2-817 - ... circuit and cutting in the regulating resistance. This causes a momentary drop in voltage so that the contacts close again. This opening and closing of the contacts is repeated so rapidly as to be imperceptible to the eye, and holds the voltage constant.
Page 2-780 - The spark plug being included in the secondary circuit opposes the flow of the current by the high resistance of its air gap. Since the pressure of the secondary current is sufficient to overcome this resistance, it flows or "jumps" across the gap and in so doing intense heat is produced resulting in a spark. Sometimes the spark is obtained by keeping the primary circuit closed except during the brief interval necessary for the passage of the spark at the plug points. A secondary spark, then, may...
Page 2-664 - ... in the motors or motor circuits, which are usually protected by the quicker acting circuit breaker. This fuse should not be replaced on the road except to avoid serious delay to the service, as in the case of single cars. BEFORE RENEWING MAIN FUSE, OPEN THE MAIN SWITCH. 62. A SHOE FUSE MAY BLOW from short circuit, grounding of the car wiring on some part of the car or truck, or may be caused by a contact shoe on the car or train grounding, due either to being broken or from fouling or picking...

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