GB236986A - Improvements in telephone receivers, loud speakers and like instruments - Google Patents

Improvements in telephone receivers, loud speakers and like instruments

Info

Publication number
GB236986A
GB236986A GB901124A GB901124A GB236986A GB 236986 A GB236986 A GB 236986A GB 901124 A GB901124 A GB 901124A GB 901124 A GB901124 A GB 901124A GB 236986 A GB236986 A GB 236986A
Authority
GB
United Kingdom
Prior art keywords
instruments
casing
telephone receivers
loud speakers
aluminium
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
GB901124A
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.)
ARTHUR PREECE
Original Assignee
ARTHUR PREECE
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 ARTHUR PREECE filed Critical ARTHUR PREECE
Priority to GB901124A priority Critical patent/GB236986A/en
Publication of GB236986A publication Critical patent/GB236986A/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)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)

Abstract

236,986. Preece, A. April 9, 1924. Magnetic instruments.-In telephone receivers,. in which the vibrating member is acted upon by a centrally disposed straight bar magnet capable of adjustment towards or away from the vibrating member, an aluminium or other non-magnetic plug k carries the bar magnet d and is screwed into or otherwise adjustably mounted in the casing a. The casing is of non-magnetic material such as aluminium and the cap b of vuleanite. The bobbin f for the coil is extended to facilitate fixing to the casing a to take the terminals h. The upper part of the magnet may be tapered as shown.
GB901124A 1924-04-09 1924-04-09 Improvements in telephone receivers, loud speakers and like instruments Expired GB236986A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB901124A GB236986A (en) 1924-04-09 1924-04-09 Improvements in telephone receivers, loud speakers and like instruments

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB901124A GB236986A (en) 1924-04-09 1924-04-09 Improvements in telephone receivers, loud speakers and like instruments

Publications (1)

Publication Number Publication Date
GB236986A true GB236986A (en) 1925-07-09

Family

ID=9863616

Family Applications (1)

Application Number Title Priority Date Filing Date
GB901124A Expired GB236986A (en) 1924-04-09 1924-04-09 Improvements in telephone receivers, loud speakers and like instruments

Country Status (1)

Country Link
GB (1) GB236986A (en)

Similar Documents

Publication Publication Date Title
GB636190A (en) Improvements in and relating to phonograph pickups
GB236986A (en) Improvements in telephone receivers, loud speakers and like instruments
GB278040A (en) Improvements in or relating to a device for converting electric oscillations into acoustic vibrations, such as a loudspeaker
GB324608A (en) Improvements relating to loud speakers
GB518815A (en) Improvements in throat microphones and methods of adjusting the same
GB204023A (en) Improvements in and relating to loud-speaking apparatus
GB214787A (en) Improvements in or relating to telephone receivers
GB206259A (en) Improvements in telephone receivers
GB236403A (en) Apparatus for converting oscillating electric currents into sound and vice-varsa
GB241151A (en)
GB203974A (en) Improvements in or relating to electromagnetic receivers
GB300837A (en) Improvements in and connected with sound reproducing instruments
GB227560A (en) Improvements in telephone receivers and the like
GB336491A (en) Improvements in loud speakers, telephones for wireless and the like
GB211826A (en) Improvements in or relating to sound-reproducing devices, applicable also for recording telegraphic signals
GB287570A (en) Improvements in or relating to loud speakers
GB243432A (en) Improvements in and connected with adjustments for the magnets in telephone receivers and the like
GB767424A (en) Improvements relating to acceleration-measuring or vibration-measuring apparatus
GB263478A (en) Loud speakers
GB218038A (en) Improvements in and relating to sound emitting or transmitting instruments
GB210358A (en) Improvements in telephone receivers
GB253487A (en) Electrical sound reproducing instrument
GB206910A (en) Improvements in telephones
GB261387A (en) An improved telephone receiver of the loud speaker type
GB254033A (en) Improvements in electrical sound converting apparatus