This apparatus consists
of two principal parts--one fixed and the other movable. The stationary
part is designated in the accompanying figure by the letters A and B and
by cross-hatchings. This forms the rod or support. An iron tube, T, with
clamps, P, at its lower extremity forms the base of the apparatus, and
is hidden, after the mounting of the apparatus, by the ornamental zinc
covering, Z. The upper part of the tube carries a shoulder-piece,
upon which rests a bronze platform, E, and which is slightly inclined
outwardly to prevent the accumulation of water on it. Over the platform
there move three crystal balls, which are held and guided by a
horizontal disk movable around the stationary tube.
The movable portion, designed to receive the action of the wind and to
indicate its direction, is designated by the letters C D and coarse
lines. It consists of (1) a zinc tube, K, provided at intervals with
copper rings, and entering the rod, A B, which serves as a guide for it;
(2) of a bronze disk covered by an external ornament, O, fixed to the
tube and resting on the balls; (3) of the vane, G, properly so called;
and (4) of the cap, C, provided with bayonet catch, crowning the tube
and covering the point of attachment of the wire of transmission.
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