Education and demonstration – Means for demonstrating apparatus – product – or surface... – Chalkboard or equivalent means having easily erasable surface
Patent
1988-02-02
1989-02-14
Grieb, William H.
Education and demonstration
Means for demonstrating apparatus, product, or surface...
Chalkboard or equivalent means having easily erasable surface
434 88, G09B 1900
Patent
active
048043273
ABSTRACT:
A magnetic tracing apparatus comprising an enclosure within which a mixture of nonmagnetic particles and magnetically attractive fragments are contained, at least one surface member of the enclosure being provided for the formation of a design image upon the inner surface upon it by causing the aforementioned mixture of materials to be attracted to the inner surface, and a permanent magnetic tracing device being provided for movement over the outer surface of the member and cause magnetically attractable fragments in the aforementioned mixture to be attracted to the tracing device to remove the attached mixture of particles and fragments from the inner surface of the member as moved along the outer surface of the member and fall therefrom; the principal improvement being the inclusion of supports of a number of different types which are attached in various ways to the enclosure and are operable to move the enclosure about at least one axis to agitate the mixture within the enclosure and thereby destroy the aforementioned design image and re-establish an uninterrupted layer of the mixture upon the inner surface of the aforementioned one surface member of the enclosure.
REFERENCES:
patent: 2589601 (1952-03-01), Burnett
patent: 3585735 (1971-06-01), Miller
Grieb William H.
Just C. Hercus
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