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Blanche Coules Thornycroft (21 December 1873 - 30 December 1950) was an English naval architect and the first female member to be admitted to the The Royal Institution of Naval Architects in 1917.

Early years
Blanche Coules Thronycroft was born in Hammersmith, London, on 21 December 1873, the third child of Blanche Ida née Coules and Sir John Isaac Thornycroft, the founder of the Thornycroft shipbuilding company. Blanche's siblings were Edith Alice (born 1871), John Edward (born 1872), Mary Beatrix (born 1875), Ada Francis (born 1877), Eldred Elizabeth (born 1879), and Isaac Thomas (born 1881, nicknamed Tom). Her aunt and uncle were the sculptors Mary Thornycroft and Hamo Thornycroft. John followed in his father's footsteps to become governing director and chairman of John I. Thornycroft and Co., Ltd, while Tom won two gold medals in the 1908 summer Olympics driving a boat which had been designed by their father (while the only other entry in both events failed to complete the course).

Despite never appearing to receive formal instruction as it was not available to women at the time, Blanche gained a reputation as an outstanding mathematician.