This object is a rectangular wooden box with a flap-up lid. On the top of the box there is a metal label. On the front face of the box there is a rectangular window with faintly visible scale. Just below this, there is a small green plastic label that says “1”. Below this there are two small holes through the wooden case of the box; three similar holes are located on on the longer side of the box. Also on a longer side of the box there are four black knobs for connecting electrical wiring.
Inside the box there is a large horseshoe magnet mounted horizontally at a slant. Between the tines of the magnet, there is an assembly with a mirror visible behind a circular window. On top of this mirror just visible there is a coiled wire in a cylindrical container.
On the interior of the four knobs, there are four wires insulated in fabric running to different parts of the mechanism. Close to the rectangular window, there is a small circular lens mounted upright, with a wire bifurcating it.
Accession Number: 2015.ph.661
Primary Materials: Wood, Iron Alloy, Plastic
Just below the mirror assembly: “CAT. NO. PI 102…” “COIL RES. 308”
Next to the black knobs: “6 VOLTS” “G.A.”
On the front of the box, on a green plastic label: “1”
On the metal label on top of the box: “LEEDS & NORTHRUP CO.”
“SERIAL NO. 345835” “CAT. NO. 2420-A”
Dimensions (cm): 21cm x 11cm x 13.2cm
Measurement of changes in electrical current.
Good. The exterior of the box is somewhat scuffed with small scrapes.The holes indicate possible modifications or removal of components.
Manufacturer: Leeds & Northrup
Date of Manufacture: Mid-20th century
Department of Physics, University of Toronto
Additional Information and References: