from the GNU version of the Collaborative International Dictionary of English
- n. A microseismometer; specif., a microseismometer producing a graphic record.
from The Century Dictionary and Cyclopedia
- n. An instrument for measuring and recording very slight earthquake-shocks or earthtremors.
Sorry, no etymologies found.
Odenbach of St. Ignatius 'college in Cleveland, O., the noted authority on seismic disturbances, reported that his microseismograph, the most delicate instrument known for detecting the presence of earthquakes in any part of the globe, had plainly recorded the disturbances caused by the eruption of Vesuvius.