A laboratory manual in physics, to accompany Black and Davis' "Practical physics for secondary schools," (1913)
Black, Newton Henry, 1874- [from old catalog] · New York, The Macmillan company · leaf 71
ass (Hahn form). Hard, sharp lead pencil. White paper. Fasten a sheet of white paper to the table with thumb tacksand lay the magnet on the paper near the middle so that itsaxis lies nearly north and south and its north-seeking pole isturned toward the south. Trace around the bar magnetwith a… … Fig. 29 Place the tracing compass on the paper near the magnet insuch a way that the S-pole notch in its rim (see Fig. 29)lies as nearly as possible right over a starting point, and thenturn the compass around this point untilthe needle stands exactly over the line onthe compass base. Then mark…
Physics
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