The eight
wires from the timer contacts connect with the outside wires of
the eight magnets separately and the inside wires from the magnets
connect with the metal brace which holds the magnets in place. A
wire is then connected from the metal brace to a push button, two
or three cells of dry battery and to the ground wire in connection
with the timer The wires are connected in such a manner that when
the vane is pointing in a certain direction the battery will be
connected in series with the coil under that part of the dial
representing the direction in which the vane is pointing, thus
magnetizing the core of the magnet which attracts the opposite
pole of the needle toward the face of the magnet and indicating
the way the wind is blowing. The pointer end of the needle is
painted black.
If the vane points in such a direction that the timer brush
connects two contacts, two magnets will be magnetized and the
needle will point midway between the two lines represented on the
dial, thus giving 16 different directions. Around the pointer end
of the needle is wound a fine copper wire, one end of which
extends down to about 1/32 in.
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