doing this is are sold at a very low figure. Itisdesigned in this way a perfect geodetic instrument, and together with a 6 shown. As mould for the face of the lead a polished that records of any seismic movements shall be pro- inch equatorial and a chronometer can be easily packed block of metal is… … zontal seismograph with clock and driving plate, the be about twice this length. A depth of from one-half COHESION—BLOCKS SUSTAINING DIRECT STRAIN. clock being started by an electric contact at the begin- to three-quarters of an inch is ample. The lead is of the horizontal motion then registering…
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