GB272990A - Improvements in or relating to electro-magnetic apparatus for use with gramophones in conjunction with loud speaking telephonic apparatus - Google Patents
Improvements in or relating to electro-magnetic apparatus for use with gramophones in conjunction with loud speaking telephonic apparatusInfo
- Publication number
- GB272990A GB272990A GB766126A GB766126A GB272990A GB 272990 A GB272990 A GB 272990A GB 766126 A GB766126 A GB 766126A GB 766126 A GB766126 A GB 766126A GB 272990 A GB272990 A GB 272990A
- Authority
- GB
- United Kingdom
- Prior art keywords
- armature
- magnetic
- holder
- cores
- gramophones
- 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
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
- H04R11/00—Transducers of moving-armature or moving-core type
- H04R11/08—Gramophone pick-ups using a stylus; Recorders using a stylus
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Accommodation For Nursing Or Treatment Tables (AREA)
Abstract
272,990. Rickets, W. J., and Paddle, L. K. March 19, 1926. Magnetic instruments.-Relates to apparatus for use in gramophones associated with telephonic loud-speaker apparatus. At the end of the tone-arm is mounted a non-magnetic holder 1, Fig. 1. in which is supported by screws 6a a U-shaped permanent magnet 5, shown diagrammatically in Figs. 5 and 6. Secured to the pole-piece 5a is a plate 6 of magnetic material on which are disposed the soft-iron cores 7, 8 of a polarized electromagnet. Between the lower ends of the cores 7, 8 and the lower forked pole-piece 5b of the permanent magnet, a soft iron armature 14 is disposed, the ends of which extend under the polar faces of the cores 7, 8. The armature is pivoted at 12<a> in a stirrup 11 of non-magnetic material connected in a detachable manner, as at 11<c>, Fig. 1, to a, non- magnetic closing member 4 fixed in the lower part of the holder 1. The pivot axis may be below the plane of the armature, as shown, or in that plane. Extending at right-angles to the armature is the stylus-lever 12, which may also form the pivot member. The armature movements are damped by pads 15 and the bearings 12a may be rubber-lined journal bearings. The electromagnet windings 9, 10 are connected in series to terminals 3 on the holder 1 and the central point 3a of the windings may be earthed through a terminal 3<a>, if desired. The felt or like damping pads 15 may be adjusted by setscrews 18.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE340889D BE340889A (en) | 1926-03-19 | ||
GB766126A GB272990A (en) | 1926-03-19 | 1926-03-19 | Improvements in or relating to electro-magnetic apparatus for use with gramophones in conjunction with loud speaking telephonic apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB766126A GB272990A (en) | 1926-03-19 | 1926-03-19 | Improvements in or relating to electro-magnetic apparatus for use with gramophones in conjunction with loud speaking telephonic apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
GB272990A true GB272990A (en) | 1927-06-20 |
Family
ID=9837382
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB766126A Expired GB272990A (en) | 1926-03-19 | 1926-03-19 | Improvements in or relating to electro-magnetic apparatus for use with gramophones in conjunction with loud speaking telephonic apparatus |
Country Status (2)
Country | Link |
---|---|
BE (1) | BE340889A (en) |
GB (1) | GB272990A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2456388A (en) * | 1946-04-03 | 1948-12-14 | Lionel B Cornwell | Magnetic sound translating head |
-
0
- BE BE340889D patent/BE340889A/xx unknown
-
1926
- 1926-03-19 GB GB766126A patent/GB272990A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2456388A (en) * | 1946-04-03 | 1948-12-14 | Lionel B Cornwell | Magnetic sound translating head |
Also Published As
Publication number | Publication date |
---|---|
BE340889A (en) |
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