Magnetic-cohesion models of scientific and mathematical structures

摘要

1,045,831. Permanent magnet. H. L. SANGSTER. May 6, 1963, No. 17762/63. Heading H1P. [Also in Division G5] A magnetic element for use in self-bonding demonstration models for various purposes comprises two half shells 41 of high permeability magnetic material spaced apart by a non-magnetic ring 3, e.g. of brass, and enclosing a permanent magnet 42 to form a simple threedimensional geometrical solid ' configuration. The half shells may be of any regular shape, e.g. hemi-spherical or half-octahedral, Fig. 41 (not shown). In modifications the element may comprise a number of magnetized spheres spaced a part by smaller spheres, which around the equatorial axis have low permeability, to form a self-bonding dipolar magnet the whole assembly being enclosed in a material of low permeability to produce a spherical element, Figs. 2 and 5 (not shown). Alternatively, magnets may be inserted in holes bored in a sphere of non-magnetic material. In a further modification, the element could be east as a sphere of permanent magnet material and an annular groove produced in it which is filled with non-magnetic material. The magnetic model elements are shown built up into various arrays which are said to correspond to common geometrical shapes, Figs. 6 and 7 (not shown), and may be used to represent crystal structures and the like.