Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. (1916)
American Technical Society · Chicago : American Technical Society · leaf 343
restored onlywhen the pulley d rotates suffi-ciently to again equalize the strain.The rotation of d, of course, carriesg with, it and g, in moving, causesthe silk fibre to rotate the shaftwdiich carries the needle. If thetemperature of the air surroundingthe instrument changes, a and bare affected… … Fig. 10. Diagram of Hot-Wire Instrument magnetic instrument for detectingand measuring the magnitude and direction of small electric cur-rents. Principle of Action. In the year 1819, Oersted discovered thata current flowing through a conductor produced an effect on amagnet. This effect is now…
Electrical engineering
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