1. IOR/V/18/281 Reference (shelfmark): IOR/V/18/281 Title: Magnetical Observations made at the East India Company's Observatory at Madras, 1846-1850 Collection Area: India Office Records and Private Papers Languages: English Date Range: 1846-1850 Extent: 1 volume
2. IOR/V/18/282 Reference (shelfmark): IOR/V/18/282 Title: Magnetical Observations made at the East India Company's Observatory at Madras, 1851-1855 Collection Area: India Office Records and Private Papers Languages: English Date Range: 1851-1855 Extent: 1 volume