@article{oai:repository.dl.itc.u-tokyo.ac.jp:00000278,
 author = {EWING, J. A.},
 journal = {Transactions of the Seismological Society of Japan},
 month = {},
 note = {application/pdf},
 pages = {140--142},
 title = {A SEISMOMETER FOR VERTICAL MOTION},
 volume = {3},
 year = {1881}
}