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A gradiometer, made of black and brass coloured metal, featuring three vertical cylinders at the top and a round frame at the bottom with measurements marked around the edge. There is a brass coloured metal box in the centre of the instrument with engraved text on one side that reads "MANUFACTURED BY / L. OERTLING LTD. / LONDON.../ No 21636...". The gradiometer has three measuring instruments (two of which appear to be spirit levels) attached to the round frame. There is a paper tag tied to the gradiometer with string.
L 280mm x W 265mm x H 785mm x Dia 265mm