Electricity for public schools and colleges (1891)
Larden, W. (Walter), b. 1855 or 6 · London : Longmans · leaf 412
achine there is a permanent magnet A that givesthe field ; the strength of this field can be regulated by connect-ing the two poles of the magnet com-pletely, partially, or not at all, by a softiron keeper. In medical coils thisregulator is an essential addition. Inthe front of the magnet poles… … order to increase by magnetic induction the number of marked lines of force piercing the coils. Let B and B start from the position shown. Then, as weturn them through iSo°, we first withdraw the lines that piercethem, and then introduce lines in the opposite direction. Hencethe E.M.F. in each coil…
Electricity
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