| Description | Daily readings of magnetometers at hourly intervals made at the Colaba Observatory. On amended printed sheets, with columns for: unifilar magnetometer 'in arc', 'S.H.F.' [small horizontal force] magnetometer, declination magnetometer 'in arc', 'S.D. no.2' [small declination magnetometer], attached thermometer readings, and Gottingen mean time. The instrument ordering appears to change during the year.
The front cover is inscribed: 'Daily Register of Small M [magnetometer] Instruments July 1846'. . |