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John Turnbull Junior, consulting engineers, of 255 Bath Street, Glasgow.
1877 John Turnbull Junior set up as a consulting engineer, making a speciality of steam-engine work and water motors. He brought out a compound engine and invented a simple cut-off valve gear, and was the author of "A Short Treatise on the Compound Engine," the "Engineer's Guide Book," "Arithmetical Questions," and "Water Wheels and Turbines." He was widely consulted with regard to water power and steam power, and was well known as an expert machinery valuer
1890 June. Edinburgh International Exhibition. Turbines, wheels, cases and governors.
1890s On return from studying water-turbines in the USA, William Lawrie Turnbull joined his father as partner, the firm becoming John Turnbull, Jun. and Sons, consulting engineers. Work included the installation of several large "Hercules" turbine sets.