TIMELY WARNING AGAINST EARTHQUAKES OR TSUNAMIS ON LAND AND SEA

摘要

Earthquake signalling arrangement A-B: it is composed of a pendulum hanging from the ceiling or from a firm base and being in relationship to the earth. At the first seismic vibrations, the pendulumis oscillating to actuate the electric device emitting alarm signal to warn people at the crucial moment. Tsunami signalling arrangement - : it is composed of a special electric switch combined withthe mechanical part of a float rising and lowering in the direction of the sea waving; at the raising of the float, the two keys thereof strike the respective keys of the electric switch for thecircuit to be closed and the audio alarm(s) sent to urge people found on the land to run away from the coast.