2),
upon which is placed in equilibrium a rod that terminates in a weight, P.
The corrugations of the funnel carry letters indicating the four cardinal
points, and the funnel itself is capable of revolving in such a way that
the marked indications shall always correspond to the real position of the
cardinal points. When a horizontal shock occurs, the weight, P, falls in a
direction opposite thereto, and into one of the corrugations, where it
rests, so that the direction of the shock is indicated. But, in falling,
it causes the lever, F, to tilt, and this brings about an electric contact
between the screw, _h_, and the column, _n_, which sends a current into
the electro, E, so that the armature of the latter is attracted. In its
position of rest this armature holds a series of parts, S, A, L, which
have the effect of stopping the pendulum of a clock placed upon the same
apparatus. At the moment, then, that the armature is attracted the
pendulum is set free and the clockwork is started. As the current, at the
same time, sets a bell ringing, the observer comes and arranges the
apparatus again to await a new shock. Knowing the hour at which the hand
of the clock was stopped, he sees how long it has been in motion again and
deduces therefrom the precise moment of the shock.
Pages:
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69