The elements of dynamic electricity and magnetism (1903)
Atkinson, Philip. [from old catalog] · New York, D. Van Nostrand company · leaf 378
connectedwith the binding-posts h h. A verythin sheet-iron disk, PP^ 2^ inches indiameter, varnished to protect it fromoxidation, covers the circular spacewithin which the bobbin and magnetpole are placed, and is held in position,at its edges, by the ear piece W, whichis screwed over it as shown.… … 362 DYNAMIC ELECTRICITY AND MAGNETISM. tact. There is also a similar amount of space betweenthe disk and the ear piece: and the vibrations producedby the variations of magnetic energy are limited by theelasticity of the disk; its center vibrating very slightly,while its edges are held fast. This…
Electricity · Magnetism
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