A. M. Hamilton

The second eldest of these was the evolutionary biologist W. D. Hamilton, and one of their daughters, Mary R. Bliss, who followed her mother by becoming a doctor, achieved some notability for designing mattresses to prevent bedsores in geriatric patients.

[1] Between 1928 and 1932 Hamilton was the principal engineer of a British-built strategic road across Southern Kurdistan, which ran from Erbil, through Rawandiz, to the Iranian border near modern-day Piranshahr.

During the construction of the road, Hamilton became aware of the need for strong, adaptable bridges with components that could easily be transported and erected in remote and/or difficult terrain.

With British Insulated Callenders Cables, now Balfour Beatty Power Networks Ltd, he designed the Callender-Hamilton bridge system, the income from which helped support his family.

Although not ordered in quantity by the Air Ministry, a number of these Callendar-Hamilton hangars were built in Britain in the late 1930s and early years of World War II.