Announced his electromagnetism reaction test above all, introduced his experimental device, because the invention of phenomenon of this electromagnetism induction counterpoises to be able to put in farad younger brother 's charge only, the creation power of transformer pulled younger brother illegally also to not be belonged to. Although henry is very regretful the discovery of the ground and electromagnetism induction phenomenon counterpoises and the creation power of transformer brushs a shoulder and pass, but the his contribution on electricity, contribution that invents to transformer is be obvious to all. What be worth to be carried particularly is, henry experiment device compares farad younger brother induction coil is more adjacent at contemporary and general transformer.
From the point of contemporary transformer principle, farad younger brother induction coil is an odd heart closes transformer of type of magnetic circuit double winding. Because there is not alternating current source at that time, so it is a kind of primitive pulse transformer, and henry transformer is magnetic circuit of a kind of primitive double heart open a way transformer of pulse of double winding type.
1835, american physicist admire is strange (C.J.Page, 1812 ～ 1868) makes the induction coil that the graph shows 4 times, this coil is the world the first from Ou transformer, the vibration that uses automatic weight makes mercury puts through or open circuit. In deputy edge coil n/ele be induced by electric potential energy makes the electric spark of a vacuum tube amounts to 4.5 inches to grow.
1837, british priest Ka Lan (transformer divides N.J.Callan) Jiang Peiji do not have electric connective two parts (graph 5) , should open switch M, disconnect when the circuit of coil A, criterion the S between the two end of coil B will produce scintilla.
Like the transformer of farad younger brother, Henry, admire surprises and card orchid transformer is to use intermittent the equipment that dc works, can use at experimental observation only, do not have actual application value.
German technician Lumukeerfu (H.D.Ruhmkorff, 1803 ～ 1877) is invented in transformer history going up is the person with a larger contribution. He gives birth to Yu Deguo, settle to Paris after, set accurate machinery to make workshop oneself. Lumukeerfu is in theoretic do not have contribute, but the proposal that he is good at studying other, use the specialty with his deft heart to pay Zhu Shi carry out, made a few admirable induction coil. 1842, below the guidance of Masson and Brequet, he begins to undertake study to Ka Lan transformer. Made the first induction coil 1850 (Inductorium) . 1851, he puts forward coil of scintilla of the first induction (transformer) patent, lumukeerfu if induction coil pursues 6, the graph is shown 7 times. Core is made with soft iron silk, bag of former edge coil is circled on core, deputy foul line encircles a bag to be circled on former edge coil. Primary foul line is encircled by accumulator power supply, magnetize core orgnaization to relapse through, add up to mercuric switch, make the line connects former edge to relapse with pulsatile dc in the circle haul. In deputy edge coil criterion the induction is handed in change electric current. Compare with the induction coil photograph previously, induction coil has Lumukeerfu bigger improve. Above all the insulation of deputy edge coil is more reliable, coil is circled into with lacquer copper cash, stiff insulation of paper or lacquer is used between coil layer, deputy edge coil and former edge coil use canal of a glass to separate; Next, lumukeerfu uses the invention of E.English and C.Bright, deputy edge coil cent becomes a few paragraphs, each paragraphs each other departure, string together together next. The dot that can make voltage the biggest so (end giving a clue the distance between S—S) is farthermost. Later, lumukeerfu undertook improvement to this coil, be like the switch of alcohol of mercuric switch instead that will use before, not only can eliminate switch scintilla, and can prevent combustion; In addition, he still is encircled in primary foul line receive capacitor in order to heighten inductive tension. Coil of husband of Er of rash Mu division because power is greater, not only can use as experiment, and still can use at discharge cure. Because this can say, lumukeerfu induction coil is the first transformer that has economic value.
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