GB653844A - Improvement in electromagnetic devices - Google Patents
Improvement in electromagnetic devicesInfo
- Publication number
- GB653844A GB653844A GB6069/48A GB606948A GB653844A GB 653844 A GB653844 A GB 653844A GB 6069/48 A GB6069/48 A GB 6069/48A GB 606948 A GB606948 A GB 606948A GB 653844 A GB653844 A GB 653844A
- Authority
- GB
- United Kingdom
- Prior art keywords
- per cent
- nickel
- improvement
- iron
- electromagnetic devices
- 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
Abstract
A loud-speaker or microphone (see Groups XXXV and XXXIX), employs permanent magnets composed of 53 per cent iron, 20 per cent nickel, 10 per cent aluminium, 12 per cent cobalt and 5 per cent copper, an armature composed of 3.8 per cent molybdenum, 78 per cent nickel and remainder iron, and pole members composed of 45 per cent nickel and remainder iron.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US296823A US2267808A (en) | 1939-09-27 | 1939-09-27 | Electromagnetic device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB653844A true GB653844A (en) | 1951-05-30 |
Family
ID=23143722
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB6069/48A Expired GB653844A (en) | 1939-09-27 | 1948-02-27 | Improvement in electromagnetic devices |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US2267808A (en) |
| FR (1) | FR960440A (en) |
| GB (1) | GB653844A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2443784A (en) * | 1943-05-17 | 1948-06-22 | Barber Coleman Company | Relay |
| US2454973A (en) * | 1944-12-01 | 1948-11-30 | Gen Electric | Polarized electromagnetic control device |
| US2912523A (en) * | 1955-10-26 | 1959-11-10 | Industrial Res Prod Inc | Electro-acoustic transducer |
| US3222796A (en) * | 1962-06-11 | 1965-12-14 | Cryodry Corp | Method of freeze-drying foods by direct gas injection |
-
0
- FR FR960440D patent/FR960440A/fr not_active Expired
-
1939
- 1939-09-27 US US296823A patent/US2267808A/en not_active Expired - Lifetime
-
1948
- 1948-02-27 GB GB6069/48A patent/GB653844A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR960440A (en) | 1950-04-18 |
| US2267808A (en) | 1941-12-30 |
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