H. Bromley was an early member (later a life member) of the Cape Society of Civil Engineers (founded 1902) and its successor, the South African Society of Civil Engineers. In 1903 and 1904 his address is given as Pauling & Co., Cape Town. He was still in Cape Town in 1905, resided in George in 1906, and was back in Cape Town during 1907-1910. During the latter year he served on the society's council. In October 1907 he read a paper on "The failure of the Great Brak temporary bridge and the salving of a locomotive" before the society, followed several years later by "The training of artesans and skilled operators in South Africa" (Minutes of Proceedings of the South African Society of Civil Engineers, 1912, Vol. 10, pp. 55-61). In 1913 he resided in Highlands, Natal.
H. Bromley should not be confused with Robert Bromley, also a civil engineer, who worked in the Public Works Department in Cape Town at this time and was a founding member of the South African Association for the Advancement of Science.