| Description | Magnetometer observations made mainly at Cape Adare, East Antarctica. Sheets for vibration [pp.11-121] contain initial information on the date, observing station, latitude and longitude, chronometer type, error at station, daily rate, magnet used and other data. The main tables record numbers of vibrations with scale moving apparently to the right, and moving to the left, followed by calculations concluding with observation of torsion. Sheets for deflection [pp.202-299] contain initial information on date, observing station, latitude and longitude, mean time commencing and ending, magnet and deflecting magnet suspended, with one divison of scale. The main tables record east and west deflections in centimeters with vernier readings, coreections and means and differences. These are folowed by calculations and values for observed angles of deflection. For each set of observations, the first [p.11 and p.203] is made at Kew Observatory and the last [p.121 and p.299] at Hobart, Tasmania.
Made during the British Antarctic Expedition 1898-1900 [the Southern Cross Expedition] led by Captain Carsten Borchgrevink.
Each recto sheet is headed either 'Observations of vibration' or 'Observations of deflection', marked as 'K.O. Mag. Form A.' and 'K.O. Mag. Form B' [Kew Observatory]. The observer is noted on each sheet, with the signatures of Louis Bernacchi and William Colbeck. Some verso pages have pencilled notes and calculations. The volume begins with pasted-in certificates of examination of two centigrade thermometers [pp.1-4] and one loosely indserted certificate for unifilar magnetometer no.138 [pp.7-10], issued by Kew Observatory, and authorised by Charles Chree, as Superintendent. |
| AdminHistory | For a full description of how to take measurements using the Kew Observatory pattern unifilar magnetometer see: https://theodora.com/encyclopedia/m/magnetometer.html |