US226902A - Fkancis d - Google Patents

Fkancis d Download PDF

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Publication number
US226902A
US226902A US226902DA US226902A US 226902 A US226902 A US 226902A US 226902D A US226902D A US 226902DA US 226902 A US226902 A US 226902A
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United States
Prior art keywords
diaphragm
piece
deaf
ear
iron
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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English (en)
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Electric hearing aids
    • H04R25/02—Electric hearing aids adapted to be supported entirely by ear
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R2460/00—Details of hearing devices, i.e. of ear- or headphones covered by H04R1/10 or H04R5/033 but not provided for in any of their subgroups, or of hearing aids covered by H04R25/00 but not provided for in any of its subgroups
    • H04R2460/13—Hearing devices using bone conduction transducers

Definitions

  • FRANCIS D. CLARKE of New York city, in the county and State of New York, at present connected with the New York Institution for the Deaf and Dumb, and
  • MAGOMB G. FOSTER of New York city aforesaid, have invented certain new and useful Improvements in Apparatus or Devices for Aiding the Deaf to Hear; and we do hereby 1o declare that the following is a full and exact description thereof.
  • Figure 1 is a plan view of that side of our improved device to which the handle is attached
  • Fig. 2 is a view at right angles to that shown in Fig. l, partly in section.
  • A is an extended disk of suitable wood, having a rim, to, to which is attached an iron diaphragm, B, so that the middle is free to vibrate like a drum-head.
  • A is a stout extension of wood from the back of A, and A is a convenient-shaped handle fixed in A. These parts A A A may be all formed in one piece, or may be in separate pieces suitably joined.
  • C is a permanent magnet, straight, with plane ends, and provided with screw-threads c, engaging in corresponding female threads in its bearing in the body A, so that by turning it may be adjusted with delicacy, with oneend close to but not touching the sonorously-vibrating iron B. It stands at right angles to the plane of B, so that each undulation or movement of B carries it alternately to and from the end of O in the line of the axis thereof, this being, as we understand, the most favorable condition for exciting electrical currents in a helix surrounding the magnet.
  • D is such helix.
  • One long fine helix was employed, with one end extended a little and united to the piece B, communicating, when in use, with the teeth of the user, and with the other end extended longer and terminating in a small piece of sponge, E, which, when not in use, may be wound around the body A out of the way, and when in use may be thrust partially or entirely in one ear of the person using the apparatus.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Neurosurgery (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Magnetic Treatment Devices (AREA)
US226902D Fkancis d Expired - Lifetime US226902A (en)

Publications (1)

Publication Number Publication Date
US226902A true US226902A (en) 1880-04-27

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ID=2296287

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US226902D Expired - Lifetime US226902A (en) Fkancis d

Country Status (1)

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US (1) US226902A (fr)

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