SENSITIVE
MANY people who read our story about earthquakes a few weeks ago and saw our picture of the riew pen recording seismograph at the Wellington Seismological Observatory have wondered what the sensitive part of this instrument looks like. George Eiby, Geophysicist at the Observatory, whose talks on earthquakes have been heard in the Main National Programme on recent Sundays, lent us a picture of it when we saw him for Open Microphone, and it only just failed to get into this page-where it probably doesn’t really belong-with the piece we ran about him a fortnight ago. Here it is at lastthe Willmore Vertical Component Seismometer. "The black centre portion," Mr Ejiby explains, "is a heavy cylindrical magnet, suspended from the frame of the instrument by flat springs. When the earth moves up and down, it carries the frame with it, but the magnet tends to lag behind. As a result of the relative movement, electric currents are generated in qa small pickup coil attached to the frame. These are amplified and used to drive the pen recorder unit shown in your article a few weeks ago."
Permanent link to this item
Hononga pūmau ki tēnei tūemi
https://paperspast.natlib.govt.nz/periodicals/NZLIST19570412.2.38
Bibliographic details
Ngā taipitopito pukapuka
New Zealand Listener, Volume 36, Issue 922, 12 April 1957, Page 21
Word count
Tapeke kupu
187SENSITIVE New Zealand Listener, Volume 36, Issue 922, 12 April 1957, Page 21
Using this item
Te whakamahi i tēnei tūemi
Material in this publication is protected by copyright.
Are Media Limited has granted permission to the National Library of New Zealand Te Puna Mātauranga o Aotearoa to develop and maintain this content online. You can search, browse, print and download for research and personal study only. Permission must be obtained from Are Media Limited for any other use.
Copyright in the work University Entrance by Janet Frame (credited as J.F., 22 March 1946, page 18), is owned by the Janet Frame Literary Trust. The National Library has been granted permission to digitise this article and make it available online as part of this digitised version of the New Zealand Listener. You can search, browse, and print this article for research and personal study only. Permission must be obtained from the Janet Frame Literary Trust for any other use.
Copyright in the Denis Glover serial Hot Water Sailor published in 1959 is owned by Pia Glover. The National Library has been granted permission to digitise this serial and make it available online as part of this digitised version of the Listener. You can search, browse, and print this serial for research and personal study only. Permission must be obtained from Pia Glover for any other use.
Log in