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Expired
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GB2377224A
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Individual
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Individual
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Priority to GB2377224ApriorityCriticalpatent/GB244210A/en
Publication of GB244210ApublicationCriticalpatent/GB244210A/en
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
Abstract
244,210. Watkins, A. H. Oct. 8, 1924. Magnetic instruments. - In a loud-speaker in which the magnet system C, D is supported by a strong coil spring E and is held down against this spring by a screw H, the screw H passes through a hole in the table B supporting the magnet system and screws into a nut K integral with or carried by the base a of 'the casing A. The head G of the screw bears downwards upon the table and may be sunk in a recess, therein. Ball bearings g may be placed between the table and the under surface of the head. The screw may be rotated for adjustment by means of a lever arm L which passes out through a slot M in the casing.
GB2377224A1924-10-081924-10-08Improvements in loud speakers
ExpiredGB244210A
(en)