He was born in Islington, London, the son of Leonard Barlow, an electrical engineer. He entered University College, London where, apart from the World War II years (which he spent ar Royal Aircraft Establishment, Farnborough), he spent most of his working life. He was taught by Ambrose Fleming, who held the Pender Chair there. Barlow went on to succeed Fleming in that chair, and hence also in the post of head of department. Among his students, Barlow supervised Charles Kao, the 2009 Nobel Laureate for Physics, for a doctoral degree.
Honours and awards
In March, 1961 he was elected a Fellow of the Royal Society. His application citation stated that he: " Has made important contributions to the devising of improved measuring techniques at centimetre wavelengths. In particular has developed methods of measuring centimetre-wave power by radiation pressure and by use of the Hall Effect in semi-conductors; has made detailed studies of the conductor loss in wave guides and has added substantially to knowledge on the characteristics of surface waves. His further application of the Hall Effect to power measurement at low frequencies is likely to prove of considerable electrical engineering value. He has published two books on centimetre-wave measurements and some 35 scientific and technical papers". 
In 1988, Barlow was awarded the Royal Medal of the Royal Society in Engineering category, "In recognition of his distinguished research, particularly on microwaves and waveguides, and of his lasting influence as the founder of an unusually productive research school."
- Leonard Monteagle Barlow, his elder brother.
- Cullen, Alexander Lamb (1990). "Harold Everard Monteagle Barlow. 15 November 1899-20 April 1989". Biographical Memoirs of Fellows of the Royal Society. 36: 18. doi:10.1098/rsbm.1990.0022. JSTOR 770078.
- "Library and Archive Catalog". Royal Society. Retrieved 10 December 2010.
- email@example.com. "Heriot-Watt University Edinburgh: Honorary Graduates". www1.hw.ac.uk. Retrieved 2016-04-07.
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