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ends of the imperfect contact and the ends of the secondary, an a condenser in one of the latter connections.

13. In a receiver for electrical oscillations, the combination of an imperfect electrical contact, a local circuit through it, an induction-coil, the primary of which consists of two wires connected in parallel wound in four layers the first and second layers being formed of one wire and the third and fourth of the other, the secondary of which consists of several layers, the number of turns in the outer layers being less than in those next the primary, a capacity connected to one end of the primary, a conductor connected to the other end, and connections between the ends of the imperfect contact and the ends of the secondary.

14. In a receiver for electrical oscillations, the combination of an imperfect electrical contact, a local circuit through it, an induction-coil, the primary of which consists of two wires connected in parallel wound in four layers the first and second layers being formed of one wire and the third and fourth of the other, the secondary of which consists of several layers, the number of turns in the outer layers being less than in those next the primary, a conductor connected to the other end, connections between the ends of the imperfect contact and the ends of the secondary, and a condenser in one of the latter connections.

15. In a receiver for electrical oscillations, the combination of an imperfect electrical contact, a local circuit through it, an induction-coil, the primary of which consists of two wires connected in parallel wound in four layers the first and second layers being formed of one wire and the third and fourth of the other, the secondary of which consists of several layers, the number of turns in the outer layers being less than in those next the primary and wound unsymmetrically with a lump at one end, and connections between the ends of the imperfect contact and the ends of the secondary.

16. In a receiver for electrical oscillations, the combination of an imperfect electrical contact, a local circuit through it, an induction-coil, the primary of which consists of two wires connected in parallel wound in four layers the first and second layers being formed of one wire and the third and fourth of the other, the secondary of which consists of several layers, the number of turns in the outer layers being less than in those next the primary and wound unsymmetrically with a lump at one end, a capacity connected to one end of the primary, a conductor connected to the other end, connections between the ends of the imperfect contact and the ends of the secondary, and a condenser in one of the latter connections.

17. In a receiver for electrical oscillations, the combination of an imperfect electrical contact, a local circuit through it, an induction-coil, the primary of which consists of wires connected in parallel and wound in layers, the number of turns in the outer layers being less than in the inner layers, a capacity connected to one end of the primary, a conductor connected to the other end, and connections between the ends of the imperfect contact and the ends of the secondary.

18. In a receiver for electrical oscillations, the combination of an imperfect electrical contact, a local circuit through ti, an induction-coil, the primary of which consists of wires connected in parallel, a capacity connected to one end of the primary, a conductor connected to the other end, and the secondary of which consists of several layers, the number of turns in the outer layers being less than in those next the primary, and connections which connect in circuit the imperfect contact and the secondary.

19. In a receiver for electrical oscillations, the combination of an imperfect electrical contact, a local circuit through it, an induction-coil, the primary of which consists of wires connected in parallel, a capacity connected to one end of the primary, a conductor connected to the other end, the secondary of which induction-coil is wound in sections, each consisting of several layers, and circuit connections connecting in circuit the imperfect contact and the secondary.

Witnesses:

Francis G. Applegate,

Joseph H. G. Reed.