Well's natural philosophy : for the use of schools, academies and privte students, introducing the latest results of scientific discovery and research ; arranged with special reference to the practical application of physical science to the arts and the experiences of everyday life ; with three hundred and seventy-five engravings (1873)
Wells, David A · New York : Ivison, Blakeman, Taylor and Co. · leaf 429
th» traveler. The ordinary compass consists of a mag-netic needle, or bar balanced upon a pivot, andinclosed within a shallow box, or metallic case. Uponthe bottom of the box is a circular card with the chief, orcardinul points of the horizon, north, south, east, west,marked upon it. Fig. 354… … What is theconstruction ofthe Sea, orMariners Com-pass? In the Sea, or Mariners Compass, the needle is attached to the under side of the card, in such a way that both traverse together—the needle itself being out of sight. Upon the surface of the card is engraved a radiating diagram, dividmg the…
Physics · Science · Technology
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