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Leeds & Northrup Optical Pyrometer


This instrument consists of two parts: A square body that hold batteries and the instrument displays, and a handheld eyepiece. The two are attached by means of a short cable that is connected to the body with a screw connection. The eyepiece is stored in a metal holder on one side of the instrument body.

There is a dial readout on top surface that provides a temperature reading in degrees Celsius. The front surface of the body has a disk-shaped knob.

Accession Number:

Alternative Name: Leeds and Northrup Optical Pyrometer.

Primary Materials: Iron Alloy, Rubber, Plastic.


A gold label attached to the from body reads “U of T Physics No 69 041 0 10”. Printed lettering at the top of the instrument includes the following information: “SERIAL NO. 1756331”, “Cat. No. 8632-0”. A handwritten label affixed to the top of the instrument reads: “Pyrometer reading was 5-8° below now calibrated value”.

Dimensions (cm): Width = 18, length = 40, height = 33.


An optical pyrometer is an instrument to measure heat. The instrument uses a reference lamp or filament that the user adjusts to create a visual match to a heat source. The instrument indicates the temperature of the reference source.


Good: The entire instrument is dusty, worn, and tarnished. The cable connecting the eyepiece to the instrument body has been repaired with blue electrical tape. The six C cell flashlight batteries that powered the unit were heavily corroded and leaking onto the instrument surface.

On Sept 17, 2018, the battery case was opened, the batteries removed, and most of the corroded material removed. One of the battery leads has become detached due to the corrosion. These parts are stored inside the battery case.

Associated Instruments:


Leeds & Northrup Co., Philadelphia.

Date of Manufacture: c. 1969.


This item was recovered, along with a number of other artifacts, during the cleanup process following the closure of the IsoTrace tandem accelerator laboratory and the opening of a new facility at the University of Ottawa.

It was purchased before the establishment of the IsoTrace project, but may have been used in the sample preparation process at IsoTrace.

Additional Information and References:

Historical Notes:


  • Donated to UTSIC