Scientific Instruments > Length Measuring

Ivory Four Fold 24 inch Rule by Halden

Item#: SLG1289

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Ivory Four Fold 24 inch Rule by Halden - click to enlarge.

This is an architect 24 inches and four-fold rule, from high quality Ivory. The end plates, hinges and joints are artistically made from German silver (a silver-white alloy of copper, zinc, and nickel) The 3 hinges have a center steel bearing. The inside ivory edges are beveled and have 8 architect’s scales. The ruler is signed J Halden & Co Ltd. It was owned by a J Murray. J. Halden & Co. was established in 1877 in Rowsley Works, Reddish, Manchester. The manufacturing company was famous for its ‘Halden Calculex Circular Slide Rule’ and various measuring, drawing and surveying instruments. The company became J. Halden and Co. Ltd. as late as 1930 with an office in London.