Smith-Skaife was a motorcycle produced in 1913.
This machine had a 567cc sleeve-valve engine in which the two sleeves moved. The engine was installed in a machine and could be run on the road. It was, reportedly, very quiet with a strange-sounding exhaust.
Sources of Information
The British Motorcycle Directory - Over 1,100 Marques from 1888 - by Roy Bacon and Ken Hallworth. Pub: The Crowood Press 2004 ISBN 1 86126 674 X