Menu Close

Photoelectric Demonstrator


A photoelectric demonstration device which consists of a metal box with an electrical cord coming out of the front. There is a large glass bulb in the middle of the front face with a small light bulb directly above it. To either side of the light bulb there is a 3-way toggle switch. One is labeled “lamp”, the other “buzzer”. On the bottom middle of the front face there is a knob labeled “sensitivity”. To the left of the knob are two screws labeled “external terminals”. To the right of the knob is a 3-way toggle also labeled “external terminals”.

Accession Number:

Alternative Name:

Primary Materials:

Metal: Iron Alloy?, Glass, Plastic, Rubber


Old inventory number = “phy151”.

The markings below the large glass bulb read “no. 80936”, “Watts-12”, “Volts-115”, “FREQ.50-60”. The top right-hand corner of front face has engraved numbers “1720”. Manufacturer’s label etched into instrument: “Central Scientific Co. Chicago, Ill., U.S.A., CENCO”.

Dimensions (cm):

Height = 20.5, Width = 13, Length = 20.5


Demonstrating photocell principles and photoelectric effects.


Good: There are a few small scratches on the case of the object. The small screws holding the front panel of the demonstrator to the rest of the case are slightly corroded with rust.

Associated Instruments:


Central Scientific Co. Chicago, Ill., U.S.A.

Date of Manufacture: After 1909


Department of Physics, University of Toronto

Additional Information and References:

Historical Notes: