| RefNo | MS/119/2/115 |
| Level | Item |
| Title | Incomplete letter from Charles Morgan Elliot, Singapore to Humphrey Lloyd |
| Date | 9 February 1842 |
| Description | Elliot recounts getting very unwell, and unable to write to Lloyd before. Elliot discusses his arrival in Singapore.
Discussion on the proceedings in Singapore. Work started at the observatory on 12th December 1840. Elliot describes the dimensions of the room, and the placement of the declination, horizontal and vertical force magnets with distances. Includes results of the mutual action.
Discussion on the transit room, and the placement of the theodolite. Elliot asks Lloyd about the declination. Elliot notes the declination was first placed with stirrups and read 14 and upwards, the number then gradually decreased to a minimum, and is now on the increase.
Elliot discusses his experiments to determine the total horizontal intensity.
Discussion on the results obtained by the Hansteen apparatus. Elliot hopes they will be provided with a portable instrument that will allow them to determine the total horizontal force intensity.
Discussion on the magnetism of the bar.
Elliot discusses the agreement and disagreement of the horizontal force from Madras [Chennai], Simla and [Thiruvananthapuram] Trivandrum. Similarities of the barometrical curve to the vertical force.
Discussion on the meteorological instruments. Elliot notes the wind gauge works well. Elliot notes the Actinometer is useless in this climate.
Elliot discusses the dip circle and needles, and his method to obtain the dip using vibrations. Elliot notes the needle gave much better results at Batavia [colonial name of the capital of the Dutch East Indies, now Jakarta, Indonesia].
[The second half of this letter is missing]. |
| Extent | 6p |
| Format | Manuscript |
| PhysicalDescription | Ink on paper |
| AccessStatus | Open |
Fellows associated with this archive
| Code | PersonName | Dates |
| NA2915 | Elliot; Charles Morgan (1815 - 1852) | 1815 - 1852 |
| NA8252 | Lloyd; Humphrey (1800 - 1881) | 1800 - 1881 |