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of Port Dundas, Glasgow
Maker of stationary engines. 
1878. 'The Business of Turnbull, Grant, and Jack, Engineers, Millwrights, Boiler Makers, and Founders, in Glasgow, has been, since the 13th day of December, 1878, and continues to be, carried on by the Subscribers, as the sole Partners. Glasgow, 23rd September, 1878. John Turnbull. R. R. Grant. Henry Jack.'
1870s Supplied 2 McNaught compound condensing beam engines for the John's Lane distillery in Dublin.
1877 John Turnbull, Junior set up his own consulting business.
1881 Supplied reversing engines, mill and shear machines for Colville's Dalzell Works.
1887 Supplied cross-compound horizontal mill engine for Locke's distillery.
By 1889 had been succeeded by Turnbull, Grant and Co