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| Keywords: Callan's first induction coil.jpg The first induction coil built by Irish scientist and Catholic priest Nicholas Callan in 1836 at St Patrick's College Maynooth Ireland It is still preserved by the college It consisted of a horseshoe-shaped piece of iron with two windings of wire around it a short winding and a long winding Callan found that when he sent pulses of electricity from a battery through the short winding higher voltage pulses were produced by the longer winding This was the first step-up transformer and with it Callan discovered the principle that the voltage ratio in a transformer is equal to the turns ratio Downloaded 2008-05-12 from http //books google com/books id RDg7AAAAYAAJ pg PA18 John Ambrose Fleming 1893 The Alternate Current Transformer in Theory and Practice Vol 2 The Electrician Publishing Co London p 18 fig 12 on Google Books 1893 author Public domain PD-old Historic transformers Induction coils | ||||
