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Description: | Rectangular oak frame with split glass top; torroidal coil projects half-through glass on both top and bottom at right angles to it; insulated wires connect the coil winding on the underside of the glass to brass terminals at edge of frame; iron filings would be sprinkled onto the glass and a current passed through the coil; the filings align themselves to show the orinentation of the magnetic field around the coil. The pattern can be projected if the frame is placed on an overhead projector; a variant demonstration piece showing magnetic field around single wire ABDNP201846a | License: | http://www.abdn.ac.uk/historic/Copyright_terms_conditions.shtml | Publisher: | ABDNP University of Aberdeen, Natural Philosophy Collection of Historical Scientific Instruments | Rights holder: | 47718 | Temporal: | 1946-1960 | Source: | University of Aberdeen | Identifier: | http://calms.abdn.ac.uk/Geology/dserve.e... | Go to resource |
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projector
early handcranked film projector finished…
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