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Thompson \u003cp\u003e\u003c\/p\u003e\u003cb\u003eExcerpt\u003c\/b\u003e \u003cp\u003e\u003c\/p\u003eAlthough the construction of the compass lies outside the scope of this inquiry, some preliminary considerations are necessary concerning the origin of the compass itself; and these must be stated briefly. The mariners' compass, as we know it to-day, consists of a light circular disk or card, beneath which is attached a magnetic needle or system of magnetic needles. The card is provided at its centre with a small cap, by which it is poised movably upon a pin. 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