A natural philosophy : embracing the most recent discoveries in the various branches of physics, and exhibiting the application of scientific principles in everyday life .. (1899)
Quackenbos, G. P. (George Payn), 1826-1881 · New York, Cincinnati [etc.], American book company · leaf 346
simply a magneticneedle set in a shallow case covered with glass, on thebottom of which is a circular card, having its circumfer-ence divided into 360 degrees. At a distance of one-fourthof the circumference apart stand the letters N, E, S, W,denoting the four cardinal points—North, East,… … Lines of no Variation ? How many are there ? 878. What is the Dip of the Needle ?When and by whom was it discovered ? How may the Dip at any given place bemeasured? What is shown by experiments with the dipping needle? How greatis the dip in the latitude of Washington ? 879. In what instrument is…
Physics
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