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Isaac Smith (1839-1920) of Sydney Smith and Sons
c1839 Born son of Sydney Smith
1855-62 Apprenticed at Hyson Green Works of his father (Sydney Smith)
Became one of the principal managers of the business
1864 Sydney Smith retired from Smith Brothers and Co, handing it onto four of his sons and his son-in-law.
1879 Birth of son Ralph V. Smith
Early 1880s: A disagreement on policy led to 3 of the brothers eventually severing their connections with the business
Partner in Sydney Smith and Sons
1880-1898 Several patents in his name
1898 Joined I Mech E. An engineer's brass founder and steam gauge manufacturer. of Sydney Smith and Sons, Basford Brass Works, Nottingham
1921 Obituary 
ISAAC SMITH was born in Nottingham in 1839.
At an early age he entered the works of his father, the late Sydney Smith, inventor of the pressure gauge and manufacturer of all types of boiler mountings, steam fittings, etc.
He rapidly developed the inventive genius of his father, and brought out a patent syren, harmony and chime whistles, positive rotary water meter, etc. The latter instrument was described by him at a Meeting of this Institution in 1900 (See Proceedings, p. 65). Among other inventions of his may be mentioned a lock-up safety-valve in combination with pressure-gauge and boiler composition feeder for the prevention of corrosion of boiler plates. He possessed a thorough knowledge of commercial life, and took a prominent part in the public life of his native city, serving many years on the Town Council. He had also been a Justice of the Peace for over twenty years.
His death took place in Nottingham on 28th November, 1920, in his eighty-second year.
He became a Member of this Institution in 1898.