Roots Oil Engine Co
of Holborn-place, London
presumably the business of J. D. Roots
1889-90 James Dennis Roots made and fitted on a launch the first oil-engine used for launch or boat propulsion. Stationary and launch oil-engines to his designs were in use in 1893 in most parts of the world.[1]
1893 Maker of an oil engine for launches, claimed to be the largest make of oil launch engines in the UK[2]