US3663731A - Apparatus for making visible magnetic fields by means of iron filings - Google Patents

Apparatus for making visible magnetic fields by means of iron filings Download PDF

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Publication number
US3663731A
US3663731A US838217A US3663731DA US3663731A US 3663731 A US3663731 A US 3663731A US 838217 A US838217 A US 838217A US 3663731D A US3663731D A US 3663731DA US 3663731 A US3663731 A US 3663731A
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Prior art keywords
iron filings
cells
magnetic fields
transparent
making visible
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Expired - Lifetime
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US838217A
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English (en)
Inventor
Anders E Ofwerstrom
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ANDERS E OFWERSTROM
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ANDERS E OFWERSTROM
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
    • G09B23/00—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
    • G09B23/06—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics
    • G09B23/18—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for electricity or magnetism
    • G09B23/181—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for electricity or magnetism for electric and magnetic fields; for voltages; for currents

Definitions

  • the present invention is concerned with an educational apparatus for making visible magnetic field.
  • FIG. 1 shows a fragmentary section through the new apparatus while FIG. 2 shows a portion of the same in a plan view.
  • the iron filings for making visible the magnetic fields are divided into a plurality of small amounts, which are separated from each other in that each amount is enclosed in a cell structure.
  • the cells illustrate together a magnetic field owing to the fact that the cells are located in close vicinity to each other and that at least the upper limiting surface of each cell is transparent.
  • FIG. 1 and 2 From these figures the construction of an apparatus l is apparent, which apparatus includes a base plate 2, preferably made from a transparent material such as transparent acrylic plastic. Upon this base plate 2 is placed a network 3, which preferably is made from textile fibers or from a similar, somewhat resilient material. In the spaces 5, which are generated by the net meshes, iron filings are introduced such that every mesh will contain a certain amount of iron filings, whereupon a upper plate 4, made from transparent material such as acrylic plastic, is applied upon the net work 3. The unit is then sealed by gluing or the like.
  • a base plate 2 preferably made from a transparent material such as transparent acrylic plastic.
  • the apparatus described and illustrated above is very advantageous in that it is well suited for use in combination with an overhead projector. Owing to the transparency of the apparatus the magnetic fields may be easily illustrated by projection It has been proved that the network, which of course is pro ected at the same time as the magnetic field, has no disturbing effect at all, but it is possible to substantially avoid the visibility of the same by using a transparent material. Magnets, solenoids, galvanometers and the like may be placed upon the unit to make different experiments.
  • Apparatus for making magnetic fields visible for educational purposes comprising a substantially flat unit having an upper and lower surface, a multitude of discrete cells adjacent each other within said unit, a plurality of iron filings in each of said cells, said iron filings are freely movable only within their respective cells, and at least said units upper limiting surface of said cells being transparent so as to permit viewing of said iron filings.

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  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Business, Economics & Management (AREA)
  • Mathematical Analysis (AREA)
  • Mathematical Optimization (AREA)
  • Algebra (AREA)
  • Pure & Applied Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Computational Mathematics (AREA)
  • Educational Administration (AREA)
  • Educational Technology (AREA)
  • Theoretical Computer Science (AREA)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
  • Instructional Devices (AREA)
US838217A 1968-07-08 1969-07-01 Apparatus for making visible magnetic fields by means of iron filings Expired - Lifetime US3663731A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9360/68A SE315155B (de) 1968-07-08 1968-07-08

Publications (1)

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US3663731A true US3663731A (en) 1972-05-16

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Family Applications (1)

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US838217A Expired - Lifetime US3663731A (en) 1968-07-08 1969-07-01 Apparatus for making visible magnetic fields by means of iron filings

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US (1) US3663731A (de)
DE (1) DE1933533A1 (de)
SE (1) SE315155B (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4412176A (en) * 1980-02-22 1983-10-25 Hoechst Aktiengesellschaft Testing method for determining the magnetic properties of ferromagnetic powders
US4971562A (en) * 1990-05-25 1990-11-20 Gleason Warren J Didactic device to aid in understanding and teaching about electromagnetic fields and their effects
WO1998020472A2 (en) * 1996-10-24 1998-05-14 The New Curiosity Shop, Inc. An apparatus and method for displaying patterns of magnetic fields
US20110086333A1 (en) * 2009-10-14 2011-04-14 Haruo Matsushima Educational tool for learning quantum science

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11241681A (ja) 1997-12-26 1999-09-07 Toyota Autom Loom Works Ltd 圧縮機におけるシール機構の保護装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1549197A (en) * 1924-09-09 1925-08-11 Frank G Hanback Magnetic toy
US2530013A (en) * 1946-02-19 1950-11-14 Frank G Hanback Magnetic toy
US3426453A (en) * 1967-05-22 1969-02-11 Ibm Magnetic display device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1549197A (en) * 1924-09-09 1925-08-11 Frank G Hanback Magnetic toy
US2530013A (en) * 1946-02-19 1950-11-14 Frank G Hanback Magnetic toy
US3426453A (en) * 1967-05-22 1969-02-11 Ibm Magnetic display device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4412176A (en) * 1980-02-22 1983-10-25 Hoechst Aktiengesellschaft Testing method for determining the magnetic properties of ferromagnetic powders
US4971562A (en) * 1990-05-25 1990-11-20 Gleason Warren J Didactic device to aid in understanding and teaching about electromagnetic fields and their effects
WO1998020472A2 (en) * 1996-10-24 1998-05-14 The New Curiosity Shop, Inc. An apparatus and method for displaying patterns of magnetic fields
US5788506A (en) * 1996-10-24 1998-08-04 The New Curiosity Shop Apparatus and method for displaying the flow of a solution in response to the movement of magnetic particles
WO1998020472A3 (en) * 1996-10-24 1998-09-03 New Curiosity Shop Inc An apparatus and method for displaying patterns of magnetic fields
US20110086333A1 (en) * 2009-10-14 2011-04-14 Haruo Matsushima Educational tool for learning quantum science

Also Published As

Publication number Publication date
DE1933533A1 (de) 1970-01-29
SE315155B (de) 1969-09-22

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