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Proton Precession Magnetometer (GEM Systems)

Geophysics · Physics

A case sturdy carrying case with a blue finish and aluminum reinforced edges and corners houses multiple component of a single instrument. The case is made partly of wood. The case has two locking latches and a black plastic carrying handle on the front face.

The following components are housed in several foam recesses inside the case:

– One console unit with a display and a grid of buttons on the upper surface.

– A sensor unit consisting of a white cylinder full of liquid. This has a coiled withe for attaching to the console unit, and a screw for attaching the unit to the tip of the included staff.

– Five cylindrical sections that can be screwed together to form a single staff. These are stored in a separate compartment in the case lid.

– One black battery harness. This features a belt and adjustable quick release buckle so as to be work as a belt. A coiled cable attaches the battery back to the console unit.

-One shoulder harness with quick release buckles that attach to the console unit.

– One battery charger unit with one cable reminating in a AC wall plug, and another cable that attaches to the battery unit.

– One cable terminating in a 9-pin serial plug. This may be used to plug the console unit into a computer.

– On AC white adapter plug to from for adapting Type A to Type C.

– One small green coloured metal container containing five fuses.

Accession Number:

Alternative Name:

GEM GSM-19T Proton Magnetometer; Walking Proton Precession magnetometer; Walking Mag.

Primary Materials: Metal, Plastic, Wood.


On the bottom and top surfaces of the case are labels listing the name and address of Dr. L. A. Pavlish of the University of Toronto Department of Physics.

One the bottom surface of the case is a label that reads “Project Home Base:// Ta’yinat Archaeological Project (TAP)// Timothy P. Harrison, Director// Department of Near and Middle Eastern Civilizations, University of Toronto.// Project:// Archaeological Survey of Tell Ta’yinat, Hatay Province// Turkish Destination:// The Mustafa Kemal University in Antakya”.

On the bottom surface of the is a label from Terraplus Inc in Richmond Hill, Ontario with the address of the University of Toronto Department of Physics.

Attached to the case’s carrying handle is a plastic tag with the name and address of Dr. L. A. Pavlish.

Also attached to the carrying handle is a baggage tag from Air France flight AF 989293 from Charles DeGaul airport to Pearson International on 10 Aug 2005.

On the front surface of the case is a black embossed label that reads: “S/N 42281”.

A silver coloured label on the side of the console unit includes the following information: “MODEL NO. GSM-19TW”; “SERIAL NO. 42282:.

A circular green label on the sensor unit is not clear, but may read “1D2”

A yellow/ green label from Revenue Canada Customs, Excise and Taxation is attached to the bottom surface of the charger unit. It includes the following code: “A5044576”.

Inside the case is a paper tag from the Air France airline listing the name and address of Dr. Stephen Batiuk.

Dimensions (cm):

(Box) Height = 17.5, Width = 51.5, Length = 44.5.


A proton precession magnetometer (PPM) detects the resonance frequency of hydrogen nuclei in the presence of a magnetic field to be measured.

These instruments are used in magnetic surveys. Common applications include mineral prospecting and the detection of archaeological features.


There is white corrosion around the metal jacks on the console unit.

Associated Instruments:


GEM Systems, inc, Markham, Ontario, Canada.

Date of Manufacture: c. early 2000s.


This instrument was used c. 2005 by University of Toronto faculty in the Arcaeological Survey of Tell Ta’yinat in Hatay Province.

It was acquired on September 3rd from Dr. David Bailey of the Department of Physics Advanced Physics Laboratory.

Additional Information and References:

Historical Notes:


  • Donated to UTSIC