Abstract
IT is a common practice amongst instrument makers to put the magnetic compass needle of the pocket compass, or the marching compass used in the army, into an external case of nickel ; the case is usually furnished with a lid, after the manner of a hunting watch, and is largely used by travellers.
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JERVIS-SMITH, F. The Magnetic Compass and Nickel Cases. Nature 60, 173 (1899). https://doi.org/10.1038/060173a0
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DOI: https://doi.org/10.1038/060173a0
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