Variable Capacitance Box

Physics

Accession Number: 2009.ph.63

Description:

A wooden box with a knob on top of it. A dial underneath the knob has labels “1 2 3.22 4 5 6 7.06 8 9.20 11.9”. On this dial there is a also trademark logo “GR”. “1859 A” is inscribed on the top of the wooden box. Underneath the knob there are two metal terminals.

Alternative Name: Variable Capacitor

Primary Materials: Wood, Metal

Markings:

On the dial is the trademark logo “GR”. “1859 A” is inscribed on the top of the wooden box.

The dial settings are labelled: “0”, “1”, “2”, “3.22”, “4”, “5”, “6”, “7.06”, “8”, “9.20”, “11.9”. The non-ordinal numbers are handwritten on paper labels and applied to the dial with tape. The dial is labelled “01μf/STEP”.

Dimensions (cm):

height = 14.5cm, length = 15.5cm, width = 15.5cm

Function:

A variable capacitance box is a capacitor that allows you to change the amount of charge that can be stored.

Condition:

Good. The body of the box is in good condition. The dial surface is somewhat corroded with a white powder on the surface. The hand-made labels are peeling off.

Associated Instruments:

Manufacturer: General Radio Company

Date of Manufacture:

Provenance:

University of Toronto Department of Physics

Historical Notes: