Silas was the tenth of twelve children of John Waymouth (Timber John) and Eliza (nee Glanville).   He joined the Accounting Branch of the Royal Navy in 1853.   He was promoted to Paymaster in 1866.   For ten years he was secretary to various Commanders in Chief or Officers at the Cape, Cork or in the Mediterranean.   In 1877 Silas was appointed transport officer at Southampton and retired as Fleet Paymaster from the Navy in 1885.   He became the secretary of the Orient Company and was in that position during the Egyptian Campaign (1896-98) and the South African war (1899-1902) when the vessels were engaged for the transport of troops.   Among his charitable work, Silas was vice president of the Royal Naval Benevolent Society.
He married Jane Sutherland Miller in 1862 and they had three sons (one joined the Navy and two joined the Army).
See also the family group photo and family tree.