Description | Eleven sets of paired curves, showing magnetic readings taken at Sarawak [in red ink], with comparable readings from Singapore [in black ink].
Headed [p.1]: 'Horizontal Force Sarawak Borneo'. Signed [p.1]: 'C M Elliot Lt. Engrs'. Inscribed [p.2]: 'Daily Observations Borneo. October 1842. Horizontal Force'. |