A London encyclopaedia, or universal dictionary of science, art, literature and practical mechanics - comprising a popular view of the present state of knowledge - illustrated by numerous engravings, (14765404302)

Identifier: londonencyclopae13curt (find matches)
Title: A London encyclopaedia, or universal dictionary of science, art, literature and practical mechanics : comprising a popular view of the present state of knowledge : illustrated by numerous engravings, a general atlas, and appropriate diagrams
Year: 1829 (1820s)
Authors: Curtis, Thomas, fl. 1820
Subjects: Encyclopedias and dictionaries Aeronautics
Publisher: London : Thomas Tegg
Contributing Library: University of California Libraries
Digitizing Sponsor: Internet Archive



Text Appearing Before Image:
aceof two hours, or less. Mr. Michells method of making artificialmagnets may be thus described :—Prepare ?dozen bars of steel, of about one ounce and three-quarters weight each, six inciies long, and halfan inch broad : let these be hardened by immer-sion into water at a red heat. The size andshape of the bars maybe varied at pleasure, pro-vided that the length be proportioned to thethickness. The best sort of steel is that whichhas no veins of iron in it, and Mr. Michellfound the common blistered steel at least equalto any other. In order to preserve the bars, theymust be placed in a box furnished with twopieces of iron, about an inch long each. Thesepieces of iron may be about a quarter of aninch square, and should be filed perfectly smoothon the •ides. Aciainst these are to be placed,with their edges towards them, the twelve mag-netical bars, six on one side, with their south ornorth poles one way, and six on the other side, J,t.ie-/j:i V.-LJ3. MA^rr.MEin(§Mo ri^.J. /■u/. ^
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