. 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. ithe current to attract the armature and strike a bell, thereby estaployed in modern telegraph practice. He was made a professor at Pr he devised an arranger: ^ ing the princ;: vhich made possible Ion £ ■ amission. J the first to o*- -i reduction, and pert omul .estimations in os> electric discharges (1M2). and A phenoim- • he was c
. 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. ithe current to attract the armature and strike a bell, thereby estaployed in modern telegraph practice. He was made a professor at Pr he devised an arranger: ^ ing the princ;: vhich made possible Ion £ ■ amission. J the first to o*- -i reduction, and pert omul .estimations in os> electric discharges (1M2). and A phenoim- • he was chosen se Board, he made important I • e signals ard lig:. meteorology, terrest- he carried <•- Henry enjoyed an international reputation, and is acknowledged to be cne of Americas greatestscientists. ALTERXA TIXG CURRENTS 1,033 inductance varies as the metallic resistance, the distance betweenthe wires on the cross arm and the number of cycles per second,as indicated by accepted tables. Thus, for one mile of B. & S. copper wire, with a resistance cf 3,406 ohms, the co-efficient of self-induction with 6 inches between centers , and. with 12 inches, .00175. FLY WHEEL. 1,271.—Hydraulic-mechanical analogy illustrating inductance in an alternating current cir-cuit. The two cylinders are connected at their ends by the vertical pipes, each beingprovided with a piston and the system filled with water. Reciprocating motion is im-parted to the lower pulley by Scotch yoke connection with the drive pulley. The upperpiston is connected by rack and pinion gear with a fly wheel. In operation, the to and fromovement of the lower piston produces an alternating flow of water in the upper cylinderwhich causes the upper piston to move back and forth. The rack and pinion connectionwith the fly wheel causes the latter to revolve first in one direction, then in the other, instep with the upper piston. The inertia of the fly wheel causes it to resist any changein its state,
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