Comprise: /1 two cylinder disconnecting compound engines fitted on board the twin screw tug "Walrus", 1877; /2 [as above] fitted on board the paddle tug "Etna", 1880; /3 four cylinder disconnecting triple expansion engines fitted on board the twin-screw steamer "Arabian", 1884; /4 four cylinder disconnective quadruple expansion engines fitted on board the screw steam yacht "Myrtle", 1887; /5-6 six cylinder disconnective quadruple expansion engines fitted on board the screw steam yacht "Rionnag na Mara", 1886. Photographs of Rankin's patent marine engines built by Rankin & Blackmore, Greenock
