GB1190927A - Improvements in or relating to the Testing of the Properties of Fluid Suspensions Containing Magnetic Particles - Google Patents

Improvements in or relating to the Testing of the Properties of Fluid Suspensions Containing Magnetic Particles

Info

Publication number
GB1190927A
GB1190927A GB3592966A GB3592966A GB1190927A GB 1190927 A GB1190927 A GB 1190927A GB 3592966 A GB3592966 A GB 3592966A GB 3592966 A GB3592966 A GB 3592966A GB 1190927 A GB1190927 A GB 1190927A
Authority
GB
United Kingdom
Prior art keywords
suspension
tape
magnetic
properties
magnetic field
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
GB3592966A
Inventor
Ralph Reginald Pearce
Cyril Arthur Lee
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.)
EMI Ltd
Electrical and Musical Industries Ltd
Original Assignee
EMI Ltd
Electrical and Musical Industries Ltd
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 EMI Ltd, Electrical and Musical Industries Ltd filed Critical EMI Ltd
Priority to GB3592966A priority Critical patent/GB1190927A/en
Publication of GB1190927A publication Critical patent/GB1190927A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/12—Measuring magnetic properties of articles or specimens of solids or fluids
    • G01R33/1207—Testing individual magnetic storage devices, e.g. records carriers or digital storage elements

Landscapes

  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)

Abstract

1,190,927. Testing magnetic properties. ELECTRIC & MUSICAL INDUSTRIES Ltd. Aug. 10, 1967 [Aug.11, 1966], No.35929/66. Heading G1N. To test a fluid suspension containing acicular magnetic particles used in the manufacture of magnetic recording tape, a sample of the suspension is coated on to a moving tape and is subjected to an orientating magnetic field to produce discrete regions of orientated particles on the tape which are then, while the coating is still fluid, subjected to a disorientating magnetic field in the opposite direction, the magnitude of which is varied until no remanence is detected by a detector head 12, the value of the disorientating field then being read from meter 16. The measurement process may be entirely automatic. The suspension may be applied only to the centre of the tape and the capstan 3 may have a cut away channel in the middle of its traction surface. The suspension may be applied in a series of discrete bands, Fig. 3 (not shown), in which case the orientating magnetic field may be produced by a permanent magnet (25). The invention may be used to measure the rheological properties of paint by adding a small proportion of magnetic particles to the paint.
GB3592966A 1966-08-11 1966-08-11 Improvements in or relating to the Testing of the Properties of Fluid Suspensions Containing Magnetic Particles Expired GB1190927A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3592966A GB1190927A (en) 1966-08-11 1966-08-11 Improvements in or relating to the Testing of the Properties of Fluid Suspensions Containing Magnetic Particles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3592966A GB1190927A (en) 1966-08-11 1966-08-11 Improvements in or relating to the Testing of the Properties of Fluid Suspensions Containing Magnetic Particles

Publications (1)

Publication Number Publication Date
GB1190927A true GB1190927A (en) 1970-05-06

Family

ID=10383101

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3592966A Expired GB1190927A (en) 1966-08-11 1966-08-11 Improvements in or relating to the Testing of the Properties of Fluid Suspensions Containing Magnetic Particles

Country Status (1)

Country Link
GB (1) GB1190927A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2000295A (en) * 1977-06-10 1979-01-04 Basf Ag Method and device for determining the homogeneity of a magnetic dispersion and method of manufacturing a magnetic recording medium from such a dispersion
EP0095310A2 (en) * 1982-05-20 1983-11-30 National Research Development Corporation Apparatus and method for identification of asbestos
FR2606881A1 (en) * 1985-10-18 1988-05-20 Crostack Horst Artur METHOD AND DEVICE FOR NON-DESTRUCTIVE TESTING OF MATERIALS, IN PARTICULAR FOR THICKNESS MEASUREMENTS

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2000295A (en) * 1977-06-10 1979-01-04 Basf Ag Method and device for determining the homogeneity of a magnetic dispersion and method of manufacturing a magnetic recording medium from such a dispersion
FR2394078A1 (en) * 1977-06-10 1979-01-05 Basf Ag METHOD AND MEASURING APPARATUS FOR DETERMINING THE HOMOGENEITY OF DISPERSIONS OF MAGNETIC MATERIALS
GB2000295B (en) * 1977-06-10 1982-03-10 Basf Ag Method and device for determining the homogeneity of a magnetic dispersion and method of manufacturing a magnetic recording medium from such a dispersion
EP0095310A2 (en) * 1982-05-20 1983-11-30 National Research Development Corporation Apparatus and method for identification of asbestos
GB2121955A (en) * 1982-05-20 1984-01-04 Nat Res Dev Identification of asbestos
EP0095310A3 (en) * 1982-05-20 1984-09-05 National Research Development Corporation Apparatus and method for identification of asbestos
FR2606881A1 (en) * 1985-10-18 1988-05-20 Crostack Horst Artur METHOD AND DEVICE FOR NON-DESTRUCTIVE TESTING OF MATERIALS, IN PARTICULAR FOR THICKNESS MEASUREMENTS
GB2200214A (en) * 1985-10-18 1988-07-27 Crostack Horst Artur A process and device for electrical non-destructive material testing
GB2200214B (en) * 1985-10-18 1991-03-06 Crostack Horst Artur Improvements in or relating to a process and device for non-destructive testing or measuring

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees