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Captain William Henry Johnstone R.N. (1846-1881)
1882 Obituary 
. . . Having volunteered for active service in India with a view to employment in the Public Works Department, Lieut. Johnstone, in November 1869, joined the Bengal Sappers and Miners, at Chakrata, in the Himalayas. Here he held command of a company of native sappers for some months, and, under the Public Works Department, repaired the Chakrata and Mahona Canal, which supplies the former station with water. In November 1850, he joined the Holkar State Railway, and was principally employed on the triangulation of the Choral Valley. . . .