phonic wheel मीनिंग इन हिंदी

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With two synchronous phonic wheels at a distance, a multitude of telegraphic devices was possible.
Hammond was inspired to create the tonewheel or " phonic wheel " by listening to the moving gears of his electric clocks and the tones produced by them.
The invention was produced in August 1875, patented in 1877, and the details were published in the book " The Phonic Wheel " in 1878 in a Danish and a French edition.
The phonic wheel was used ( in the form of Delany's multiplex telegraphy ) on some telegraph lines on the chronometer, which was accurate to 0.00004 second in short time measurements.
In 1886 the Franklin Institute awarded la Cour the John Scott Legacy Medal for the phonic wheel and at the same time presented Delany with the Elliott Cresson Medal for the synchronism, a decision la Cour protested against.
After the disappointment on the American market, he produced a new invention, the phonic wheel a synchronous motor driven by a tuning fork, which used an electromagnet to rotate the cogwheel of the motor by one tooth for each vibration.