@article{oai:repository.dl.itc.u-tokyo.ac.jp:00000258,
 author = {GRAY, THOMAS},
 issue = {1},
 journal = {Transactions of the Seismological Society of Japan},
 month = {},
 note = {application/pdf},
 pages = {44--51},
 title = {ON A SEISMOMETER AND A TORSION PENDULUM SEISMOGRAPH},
 volume = {1},
 year = {1880}
}