GB191229036A - Improvements in Electric Telephones. - Google Patents

Improvements in Electric Telephones.

Info

Publication number
GB191229036A
GB191229036A GB191229036DA GB191229036A GB 191229036 A GB191229036 A GB 191229036A GB 191229036D A GB191229036D A GB 191229036DA GB 191229036 A GB191229036 A GB 191229036A
Authority
GB
United Kingdom
Prior art keywords
wiper
circuit
bears
telephones
casing
Prior art date
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
Application number
Inventor
Lester Gustavus Hammer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of GB191229036A publication Critical patent/GB191229036A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R13/00—Transducers having an acoustic diaphragm of magnetisable material directly co-acting with electromagnet
    • H04R13/02—Telephone receivers

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Telephone Set Structure (AREA)

Abstract

29,036. Hammer, L. G. Dec. 17. Telephones for deaf persons. - A telephone receiver for deaf persons is provided with a rheostat in series with the magnet coils for adjusting the intensity of the sounds heard. Bores such as 15 in an insulated block 12 contain the resistance bobbins connected to studs such as 9 with which contact is made by a wiper 14 mounted on a spindle 18 which can be turned from outside the casing by a handle 27 the motion of which is limited by stops. In one position the wiper 14 bears upon a wholly insulated stud so that the circuit is broken, but the circuit is normally completed through the metal casing of the instrument and the battery and transmitter. A spring washer (not shown) is provided between the face 25 of the insulation 12 and the collar 23 which bears upwards on the nut 22.
GB191229036D 1912-12-17 1912-12-17 Improvements in Electric Telephones. Expired GB191229036A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB191229036T 1912-12-17

Publications (1)

Publication Number Publication Date
GB191229036A true GB191229036A (en) 1913-10-09

Family

ID=32575920

Family Applications (1)

Application Number Title Priority Date Filing Date
GB191229036D Expired GB191229036A (en) 1912-12-17 1912-12-17 Improvements in Electric Telephones.

Country Status (1)

Country Link
GB (1) GB191229036A (en)

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