rbance un- meridian and. others across it. By contact points the of one here in connection with the signal service. precedented in intensity as regards that locality. ''he least disturbance causes a current to flow to the regis- To show what is done abroad in this direction, we wave, starting from… … cuit and operating registering apparatus. ‘B is intend- Fig. 1—VARIOUS SEISMOGRAPHS. Fig. 4.-APPARATUS FOR UNDULATORY MOVEMENTS, ed for weak, and. C for strong shocks. D shows an apparatus for indicating horizontal shocks... A or less severity and number. As weare going to press, from which acocoon…
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