No coin nor oath required. For personal study only.
Wear of Iron and Steel Rails.
EJour. Frank. Inst., mate determination of the variations in magnetic intensity. This method seems applicable, on ship-board, for the correction of the compass, especially when the indications of the needle may be deceptive, on account of the neighborhood of magnetic rocks, or of islands rich in iron ores. The inventor also suggests the use of a bar of soft iron, several metres in length, having, at one end, a magnetic coil with a self-registering apparatus. The pitching of the vessel would excite induction currents, and the diagram on the register would reveal the direction of the vessel, so as to check the indications of the eompass.--Uomptes l~endus. C.
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