A text-book of physics, largely experimental. On the Harvard college "Descriptive list of elementary physical experiments." (1891)
Hall, Edwin Herbert, 1855-1938, Bergen, Joseph Y. (Joseph Young), 1851-1917 · New York, H. Holt and Company · leaf 505
f the resultant force at thesepoints is greater or less than theearths horizontal magnetic force. Put the Daniell cell in circuit,through the commutator, with 15turns of the galvanoscope, andplace the latter so that the planeof its circle shall be east and west. Make in the note-book two lines,E… … Fig. 256. \ 1 Fig. 257. Hold the compass about 20 cm. south of the centre of the circleon the same level, and record with an arrow-head on the diagramthe direction of pointing of the needle. Move the compass northeight stages of 5 cm. each, recording on the diagram the direction ofthe needle at…
Physics
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