Page:United States patent 647007.pdf/5

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647,007
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winding the two ends of the wire forming the middle of the inner layer upon that layer, thirty-five turns being given in each case, and upon the second layers so formed follow layers with thirty, twenty-seven, twenty three, twenty, fifteen, ten, and five turns, respectively. After winding the outer layers of the two middle sections (those with five turns) the ends of the wire are led down and coiled on the ends of the primary forming the inner layers of the two outer sections of the secondary, forty turns being taken in each case. On each of these inner layers follow in each case layers of thirty-five, thirty, twenty-seven, twenty-three, twenty, fifteen, ten,and five turns, respectively, the wire from the outer layer (that with five turns) of the left-hand section being connected to the left-hand side of the condenser c, and the left-hand choking-coil k and the wire from the outer layer (that with five turns) of the right-hand section being connected directly to the left-hand end of the sensitive tube j.

In Fig. 3, G is a glass tube, and on it is wound the primary in two layers, there being one hundred and sixty turns in each layer. The ends of these two coils or layers are connected in parallel one to the aerial conductor and the other to earth. On the out coil of the primary is wound the first or inner coil of the secondary, which is continuous and has one hundred and fifty-three turns. The other layers of the secondary are in two sections, the second layers being formed by winding the ends of the wire forming the inner layer upon that layer, sixty turns being given in the left-hand section and sixty-three in the right-hand section. These layers are followed by layers of fifty, forty, thirty-five, thirty-three, thirty, twenty-seven, twenty-four, twenty-three, seventeen, fifteen, ten, six and two turns each in the case of the left-hand section and by layers of fifty, forty, twenty-four, twenty-two, eighteen, fifteen, ten, six, and two turns each in the case of the right-hand section, the wire from the outer layer (that with two turns) of the left-hand section being connected to the left-hand side of the condenser c and the left-hand choking-coil k and the wire from the outer layer (that with two turns) of the right-hand section being connected directly to the left-hand end of the sensitive tube j.

Fig. 4, G is a glass tube, and on it is wound the primary in two layers, there being one hundred and ten turns in each layer. The ends of these two coils or layers are connected in parallel one to the aerial conductor and the other to earth. One the outer coil of the primary is wound the first or inner coil of the secondary, which is continuous and has one hundred turns. In this case the secondary is in a single section, and the second and succeeding layers have eighty, seventy-five, sixty, fifty, forty-five, forty, twenty-eight, twenty, fifteen, ten, and five turns respectively, the wire from the inner layer (that with one hundred turns) being connected to the left hand side of the condenser c and the left-hand choking-coil k and the wire from the outer layer (that with five turns) being connected directly to the left-hand end of the sensive tube j. In this case the slope at the left-hand side of the coil is made steeper than on the right-hand side.

In Fig. 5 the primary is wound on the glass tube G in four layers, the inner layer having eighty turns. The right-hand end of the wire forming the inner layer is wound on that layer, forming the second layer, which has seventy-eight turns. The left-hand end of the wire forming the inner layer is wound on the second layer, forming the third layer, which has seventy-six turns. The right-hand end of the wire forming the third layer is wound on that layer, forming the fourth layer, which has seventy-two turns. The left-hand ends of the wire forming the inner and third layers are connected to the aerial conductor, and the left-hand ends of the wires forming the second and fourth layers are connected to earth. The secondary is wound on the outer or fourth layer of the primary and consists of sixteen layers having sixty, fifty-four, forty-six, forty-two, forty, thirty-six, thirty-two, twenty-nine, twenty-six, twenty-three, twenty, eighteen, fourteen, twelve, nine, and seven turns, respectively, the end of the wire from the inner layer (that with sixty turns) being connected to the left-hand side of the condenser c and the left-hand choking-coil k and the end of the wire from the outer layer (that with seven turns) being connected directly to the left-hand end of the sensitive tube j.

In Fig. 6 the primary consists of a single layer formed of two wires, each having one hundred and sixty turns around the tube G, their right-hand ends being connected to the aerial conductor and their left-hand ends to the earth. The secondary has three layers, the inner one having three hundred and ten turns and the second and third forty-five turns each, these being wound from the right-hand end of the inner layer. The left-hand end of the inner layer is connected to the left-hand side of the condenser c and the left-hand choking-coil k, the end of the outer layer being connected directly to the left-hand end of the sensitive tube j.

The method in which the sections of the coil are connected is found to be important.

Subject-matter herein disclosed, but not specifically herein claimed, is included in divisional applications filed by me December 26, 1899 and respectively numbered 741,613 and 741,614.

I claim—

1. In a receiver for electrical oscillations, the combination of an imperfect electrical contact, a local circuit through it, an induction coil, the secondary of which consists of several layers, the number of turns in the
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