Show ai earthquake it UA RECORDERS they are the most delicate of all Irist instruments the instruments Instrument st invented for tit alio recording of tile the motions of tile ho earths crust during nn an earthquake tire looked upon ly by scientists ns as tile elloit dell cate of till nil machines so highly sensitive are they illey indeed that the very slightest vibratory motion Is record recon lel etl perfectly avon tile iho trend of feet cannot etc app tills instrument if 1 to antio there fire chrep clagsen of ments for tile recording of with its own particular function first Is the scope which will merely detect and record the fact that hint there lus has been an earth tr tremor einor tome of those these tire are so equipped its as to indicate till the time of the disturbance second Is 14 the seismometer the function of which Is to the maxi force of the shock either with or without till 1111 indication of its diree direction tion tho the third instrument Is tile the sel iilo graph wh alch tell la Is so arral arranged ld that it will accurately record tile sue ces cession slon direction amplitude anti and period of successive oscillations the last instrument Is 14 by far the most delicate of the lie three in ili the construction of tills this earth carth quake recording machine the maker must so suspend a heavy body that when hen its normal position Is disturbed lit in the most infinitesimal degree no reactionary force will be tending to restore it to its iti original or linal position tit alie inventor lias has never been found fIll ll valio could accomplish tills this suspension of a I 1 hody body to perfection tile the seismograph of today to day however lias haj readied reached ri fi stage of perfection where dose close approximations tire obtained lit in the records made the complementary part of the instrument ment Is composed of a system of 0 lovers levers connecting an suspended body with various surfaces that tire are moved by clockwork cloe kwork those these surfaces are constructed of highly sell MII material on oil which noodles play its as the suspended responds to the vibrations of the earths crust tile the most elaborate of these matlie mathe mi jat and two horizontal motions of the earth in the case of a seismic disturbance |