We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.
Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.
ELECTRICAL ACTION 17
frequency of cycle with less massive construction and (or) lower armature speed.
D. C and A. C.
Direct current, commonly termed d. c, flows continuously in one direction. Of late the scientists have favored the view that the direction of flow is from negative to positive. In theory the flow is outward on the negative wire until a crossing point is found through some device, usually for producing heat, light or power, and then back to the generator over the positive wire. As a matter of fact it is not definitely known that anything really does flow along the conductor. Molecular bombardment is one widely accepted theory. It will serve our purpose to assume that there is an actual flow and that it is from positive to negative.
Alternating Current
(47) A. c. is the accepted abbreviation for alternating current. It is, as has already been explained, the current always generated in dynamo armatures. (48) It flows first in one direction and then in the opposite direction, (49) the change of direction occurring in ordinary commercial practice from 50 to 120 times per second. (50) Although d. c. is decidedly the better of the two for lighting purposes and may be used for heat and power production, a very large percentage of power plants distribute a. c. The novice naturally wonders why this is.
(51 ) Chiefly it is the ease with which a. c. voltage may be either raised or lowered, after generation, at any desired point along the lines. This cannot be done with d. c. except by the use of expensive machinery having moving parts and requiring more or less constant attention.
(52) Power, as expressed in horsepower, is found by multiplying voltage by amperage and dividing that product by 746. (53) The product of volts and amperes is "watts. " Seven hundred and forty-six watts equals one electrical horsepower, ordinarily abbreviated