| Reference number | MS/257/1/143 |
| Alternative reference number | Sa.143 |
| Previous numbers | ES1/22/143 |
| Level | Item |
| Title | Letter from Pieter Adrian Bergsma, London to Edward Sabine |
| Date | 21 July 1860 |
| Description | Bergsma sends Sabine the results of his dip observations [not enclosed], and discusses the mean result obtained by different needles. Bergsma returned a needle to Mr [Henry] Barrow that causing him trouble, which Mr Barrow ‘reground’ the axis for. Discussion on observations by microscopes and needles reversed, and synchronous observations with two circles. Mr [Hewark] and Bergsma conducted a number of observations with Fox’s [dip] circle which will allow them to determine the constants and errors. The observations to determine the induction coefficients have been made. All the constants of the unifilar are to be re-examined. Bergsma hopes to determine the temperature coefficient at Utrecht. Bergsma discusses the puzzling state Jones left the instruments. The magnetographs have been completed Mr [Patrick] Adie. Bergsma was presented with a standard thermometer by the Kew Committee, and assisted the meeting of the British Association at Oxford. Bergsma thanks Sabine for showing him kindness on his second visit to England. Bergsma informs Sabine he has obtained two chronometers tested at the Royal Observatory. |
| Extent | 8p |
| Format | Manuscript |
| Physical description | Ink on paper |
| Access status | Open |
Fellows associated with this archive
| Code | Name | Dates |
| NA8279 | Sabine; Sir; Edward (1788 - 1883) | 1788 - 1883 |