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break the contact [???]
alternate magnetization and demagnetization | home-made


bring a magnet to bear upon a coil
a pole opposed to this pole
setting itself at right angles
the self same end very | assemblage
surrounded by
to compare small Things with great
channel of Mercury
stem | reverse the current
sluggish Mercury.
descend | to rotate around its own axis
[room?] for playing
Reversor | a current flowing in a direction
to spin