Abstract
For the purpose of recording the variations of the three magnetic elements, declination (D), horizontal intensity (H), and vertical intensity (Z), magnetic observatories use three instruments collectively called a magnetograph. One instrument called the D‐variometer or sometimes the unifilar variometer records variations in declination; its magnet is suspended horizontally with north end of the magnet north in the magnetic meridian, by a single fibre of silk or quartz. Another, with north end of the magnet either east or west, is suspended in a horizontal plane by either a single fibre of quartz, or by a bifilar suspension of silk fibres; it records variation of the horizontal intensity and is called the H‐variometer. In the case of the bifilar suspension it is sometimes called the bifilar variometer.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
