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- Early coil by Charles G. Page, 1838, had one of the first automatic interrupters. The cup was filled with mercury. The magnetic field attracted the iron piece on the arm , lifting the wire out of the cup, breaking the primary circuit. (en)
- Modern automobile ignition coil, the largest remaining use for induction coils (en)
- One of the largest coils ever constructed, built in 1877 by Alfred Apps for William Spottiswoode. Wound with 280 miles of wire, could produce a 42 in. spark, corresponding to roughly one million volts. Powered by 30 quart size liquid batteries and a separate interrupter . (en)
- With capacitor (en)
- Without capacitor (en)
- Induction coil by Heinrich Ruhmkorff, 1850s. In addition to the hammer interrupter ', it had a mercury interrupter by Fizeau ' that could be adjusted to change the dwell time. (en)
- Early coil by William Sturgeon, 1837. The sawtooth zinc interrupter wheel ' was turned by hand. The first coil to use a divided core of iron wires ' to prevent eddy currents. (en)
- Vibrator ignition coil used in early automobiles such as the Ford Model T around 1910 (en)
- Induction coil ' powering 1915 wall mounted x-ray unit, with electrolytic interrupter '. (en)
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