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Electric Pointolite Lamp


This object consists of two parts, a box and a lightbulb attached by a wire. The metal box has sides perforated by circular holes. There is a large switch on the top and two wooden knobs. The larger knob has a cord attached which is attached at the other end to a large light bulb with four internal electrodes, some of which have metallic blobs on the end. A power cord with wall outlet plug is attached to the smaller knob.

Accession Number:

Alternative Name:

Tungsten Arc Lamp, Electrical Discharge Lamp

Primary Materials: Metal, Glass, Ceramic, Cloth, Wood


On the lightbulb: “ROYAL EDISWAN
600 CP”

Dimensions (cm):

Height = 16.2cm, Width = 20.5, Length = 20.5


This lamp is a system for providing a very bright point of light. The bulb is rated 600 Candle Power.


Good. The metallic parts of the switch are corroded. The lightbulb is blackened towards the tip. The wire is degrading and shedding fibres.

Associated Instruments:,

Manufacturer: Ediswan

Date of Manufacture: c. 1930s


University of Toronto Department of Physics

Additional Information and References:

Compare with this similar object at the Yale Peabody Museum of Natural History: <a href=>Pointolite Resistance, Ediswan</a> and this object at the Oxford Museum for the History of Science: <a href=>Electric Pointolite Lamp, by Ediswan</a>.

Historical Notes: