| RefNo | MS/119/2/140 |
| Level | Item |
| Title | Letter from John Allan Broun, Makerstoun Kelso to Humphrey Lloyd |
| Date | 1 June 1846 |
| Description | Broun wishes Lloyd a happy new year. Discussion regarding corrections to the volume of observations. Broun notes that the pages 13 and 14 are correct however the statement is wrong. Broun writes the original lines of page 13 within the letter regarding the correction of zero for effect of bifilar and balance magnets, and recommends to give the effect in all cases. Broun discusses the strength of silk fibres. Broun notes his confusion regarding the difference of the times of natural and artificial vibration of the bifilar magnet. Broun informs Lloyd that he is satisfied with his temperature corrections and that they should now be applied. Broun does not recommend to reduce the observations to a mean temperature. Discussion regarding the diurnal variation of temperature. Broun discusses his use of the positive sign regarding the differential equation. Discussion on the vibrations of the balance needle. Broun comments on Lloyd's view that there is another way of determining the coefficient for the balance magnetometer free from errors. Broun discusses his methods to obtain the coefficient for their present instruments in order to provide the observations already made more value.
Broun informs Lloyd about his intention to write a supplementary paper on the balance magnetometer.
Discussion on Broun's method of determining the temperature correction. Broun discusses his intentions to determine the correction, and write about this in their next volume of observations.
Broun discusses the uncertainty of the correction of the dip. |
| Extent | 12p |
| Format | Manuscript |
| PhysicalDescription | Ink on paper |
| AccessStatus | Open |
Fellows associated with this archive
| Code | PersonName | Dates |
| NA3813 | Broun; John Allan (1817 - 1879) | 1817 - 1879 |
| NA8252 | Lloyd; Humphrey (1800 - 1881) | 1800 - 1881 |