During his life, Caldwell was a member of the Newcomen Society, Freemasons, Shriners, Elks, and Knights of Pythias.
There are regional branches in England: Midlands (Birmingham), North West (Manchester), North East (Newcastle), Western (Bristol) and Southern (Portsmouth), and one in Scotland (Glasgow and Edinburgh).
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An American branch was established in 1923, but the Newcomen Society of the United States was entirely separate from its UK counterpart in 2007, when the chairman and trustees announced its closure.
Society of Jesus | Royal Society | National Geographic Society | American Cancer Society | Royal Television Society | American Physical Society | American Chemical Society | International Society for Krishna Consciousness | American Society of Civil Engineers | Royal Society of Canada | Royal Geographical Society | American Philosophical Society | Theosophical Society | Royal Society of Edinburgh | Society of Antiquaries of London | Society of the Cincinnati | Society for the Prevention of Cruelty to Animals | Justice Society of America | American Mathematical Society | Royal Aeronautical Society | National Honor Society | Black Label Society | Students for a Democratic Society | society | Royal Society of Arts | secret society | Royal Dublin Society | Royal Astronomical Society | London Missionary Society | Zoological Society of London |
Among other institutions, Finch was affiliated with the American Society for Engineering Education; the Society for Promotion of Engineering Education; the Newcomen Society of England; Tau Beta Pi; Sigma Xi; the Columbia Faculty Club; the Sanctum club, in Litchfield, CT; and the Century Association in New York.
Adams, a Baptist, was a member of Newcomen Society, Rotary Club, Alpha Kappa Psi and Phi Delta Theta.