The Bookshelf for boys and girls Book of Wonders and Curious Things (1912)
University Society, New York · New York: University Society · leaf 67
nnacle. InRitchies liquid compass the card floats on thesurface of a liquid composed of alcohol andwater. Young folks may quite easily make a compassof this form. Magnetize an ordinary sewingneedle by rubbing it on a simple, horseshoe magnet. If a heavy needle is used, float it on a card ora… … In 1507 William Barlowe says re-garding the compasses then in useby the East Indians: Instead of ourcompas they use amagneticall needle of sixe yncheslong and longer, upon a pin in adish of white china earth filledwith water. In the bottom there-of they have two crossed lines forthe foure…
Children's literature · Children's encyclopedias and dictionaries · Literature · Encyclopedias and dictionaries
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