GB758549A - A method for measuring magnetic field intensities - Google Patents

A method for measuring magnetic field intensities

Info

Publication number
GB758549A
GB758549A GB6835/54A GB683554A GB758549A GB 758549 A GB758549 A GB 758549A GB 6835/54 A GB6835/54 A GB 6835/54A GB 683554 A GB683554 A GB 683554A GB 758549 A GB758549 A GB 758549A
Authority
GB
United Kingdom
Prior art keywords
circuit
auxiliary
resistance
magnetic
march
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
GB6835/54A
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.)
Licentia Patent Verwaltungs GmbH
Original Assignee
Licentia Patent Verwaltungs GmbH
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 Licentia Patent Verwaltungs GmbH filed Critical Licentia Patent Verwaltungs GmbH
Publication of GB758549A publication Critical patent/GB758549A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127—Structure or manufacture of heads, e.g. inductive
    • G11B5/33—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only
    • G11B5/335—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only with saturated jig, e.g. for detecting second harmonic; balanced flux head

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)

Abstract

758,549. Magnetic recording and reproducing apparatus. LICENTIA PATENTVERWALTUNGS GES. March 9, 1954 [March 12, 1953], No. 6835/54. Class 40(2) A method of producing an A.C. control signal from a D.C. impulse by means of a magnetic transducer 1 includes a local magnetic circuit 13, carrying an audio circuit approaching saturation, and arranged such that in the absence of a D.C. signal no A.C. enters the main circuit, but such that when D.C. passes through the main circuit second harmonic of the auxiliary A.C. is'produced, a series resistance being inserted into the auxiliary circuit to aid such purpose. The ratio of the series resistance to the apparent resistance of the auxiliary circuit is between 2 and 5. The apparatus is for use wherever control or synchronizing pulses are required. The pulses may be recorded on a tape 2 by the head 1 each time the circuit of a D.C. source 9 is closed, for subsequent reproduction and supply to a control point via an amplifier 11 and band-pass filter 12. The auxiliary magnetic circuit comprises two windings 14, 15 which may be balanced by an adjustable centre tapping on the resistance 17 or by separate series resistances (shown dotted in Fig. 1), one at least of which should be adjustable.
GB6835/54A 1953-03-12 1954-03-09 A method for measuring magnetic field intensities Expired GB758549A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE758549X 1953-03-12

Publications (1)

Publication Number Publication Date
GB758549A true GB758549A (en) 1956-10-03

Family

ID=6660295

Family Applications (1)

Application Number Title Priority Date Filing Date
GB6835/54A Expired GB758549A (en) 1953-03-12 1954-03-09 A method for measuring magnetic field intensities

Country Status (2)

Country Link
GB (1) GB758549A (en)
NL (1) NL185757B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1145484B (en) * 1957-11-06 1963-03-14 Friedrich Fred Mueller Additional device for multi-track magnetic sound devices

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1145484B (en) * 1957-11-06 1963-03-14 Friedrich Fred Mueller Additional device for multi-track magnetic sound devices

Also Published As

Publication number Publication date
NL185757B (en)

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