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There is no flat answer(no pun intended) as there are different typ[es of seismographs. Obvisoulsy the big ones are non-portable and are mounted on fixed axes so they are virtually a part of the earth"s crust of bedrock. These instruments counting auxiliary ballast and such like would weigh several tons. as they are stationary, the weights are not generally quoted. Thee are portable seismometers used for mining and prospecting and these can be as light as perhaps ten or fifteen pounds. all things being equal the big boys are more accurate. in some Seismological stations they have three Seismographs, normally on all the time on different axes- for example: North-south, East_west, and vertical (Up and down) the last application would require a Gallitzin type of Seismogaph invented in Czarist Russia in about l906.This type is made in portable forms but has to be oriented to the precise vertical or horizontal axis before use-rather like a modern 35MM Camera. Sperry made seismographs. They are better known for Gyroscopes , but they did make Sesimographs,.ratrher seismometers, these were Three-axis types and could be used on Survey Ships -for oceanographic work. The three axes (R.P.I.) were selected by small rotary switches like those on some household lamps-twist on and off.

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