1. IOR/L/E/6/37, File 50 Reference (shelfmark): IOR/L/E/6/37, File 50 Title: File S&C 50/1880 - Letter from the Surveyor General of India, dated 6th November 1879, and related correspondence, regarding the retention in England of “Mr Roberts” tide calculation machine constructed for the Indian Government Collection Area: India Office Records and Private Papers Languages: English Date Range: Nov 1879-Feb 1880 Extent: 1 file