. The Ontario high school physics. direction ofthe current the needle turnedin the opposite direction (). If the battery is heldover the wire the needle isdeflected, thus showing thatthe current flows through thebattery too. 475. Detection of an Electric Current. Oersteds experi-ment furnishes a ready means of detecting an electric current,A feeble current, flowing in a sinu;le wire over a map^neticneedle produces but a very slight deflection; but if the wire is wound into a coil, and the cur-rent made to pass several timesin the same direction, either overor under the needle, or, bette
. The Ontario high school physics. direction ofthe current the needle turnedin the opposite direction (). If the battery is heldover the wire the needle isdeflected, thus showing thatthe current flows through thebattery too. 475. Detection of an Electric Current. Oersteds experi-ment furnishes a ready means of detecting an electric current,A feeble current, flowing in a sinu;le wire over a map^neticneedle produces but a very slight deflection; but if the wire is wound into a coil, and the cur-rent made to pass several timesin the same direction, either overor under the needle, or, betterstill, if it passes in one direction Fig. gfalvanoscope The wire q^^^ [^ ^ud in the OppOsite dirCC-passesseveral times around the frame, and X i its ends are joined to the binding-posts. ^[^^ under it, the cffect will be magnified (Fig. 488). Such an arrangement is called a Gal-vanoscope. It may be used not only to detect the presence of * Hans Christian Oersted (1777-1851), Professor in the University of Oopenhaj^ Fig. 487.—Oersteds experiment.
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