| 31. | In RF induction plasma torches, energy coupling to the plasma is accomplished through the electromagnetic field generated by the induction coil.
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| 32. | Another disadvantage is that the induction coils must be custom built for each molding because the coils must be from the part.
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| 33. | Instrument-makers in America, Great Britain and the European continent contributed in developing the construction and operation of induction coils.
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| 34. | Although Ruhmkorff is often credited with the invention of the induction coil, it was in fact invented by Nicholas Callan in 1836.
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| 35. | In traverse hardening systems the work piece is passed through the induction coil progressively and a following quench spray or ring is utilised.
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| 36. | Starting in the 1930s, the base of the telephone also enclosed its bell and induction coil, obviating a separate ringer box.
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| 37. | The induction coil is a fly-back system, using interruption of electrical primary system current through some type of synchronized interrupter.
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| 38. | He built a thirteen-inch ( 33 cm ) induction coil, sponsored by local individuals and this permitted shorter exposure times.
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| 39. | The batteries are periodically charged through non-contact charging using induction coils in the ground where the cars rest at Sunset Boulevard stop.
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| 40. | In the 1930s, telephone sets were developed that combined the bell and induction coil with the desk set, obviating a separate ringer box.
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