Polarizer with Measuring Dial

Uncategorized

Accession Number: 2009.ph.266

Description:

Copper alloy disc mounted in rotating copper alloy frame. The disc is connected at the back to a copper alloy standing rod. There’s an iron alloy pointer attached at the centre of the disc, and centimetre gradations around the circumference. In the centre is a smaller disc, with transparent glass revealing a piece of glass or quartz inside, held in pace by cork. This extends backwards to what appears to be an eyepiece.

Primary Materials: Copper alloy, iron alloy, glass, cork.

Markings:

Centimetre gradations around the circumference of the dial.

Dimensions (cm):

Overall height: approx. 34 cm. Diameter of disc: approx. 16 cm. Height of standing rod (without disc): approx. 23 cm.

Function:

For determining the degree of polarization of a beam of light, which passes through the internal piece of glass.

Condition:

The face of the dial and the copper alloy standing rod are heavily tarnished. There is minor fraying of the cork, resulting in a small piece of cork partly occluding the glass casing.

Manufacturer: Unknown

Date of Manufacture: Unknown

Provenance:

University of Toronto Department of Physics