Slinger was a motorcycle produced in 1901, by W. Slinger, an electrical engineer from Settle, in Yorkshire, who took six years to complete the project.
This contraption was a very peculiar looking tricycle with all three wheels in line. The rear of the machine appeared much as a conventional bicycle, whereas at the front the normal wheel and forks were replaced by a small motorcycle with two small wheels and a De Dion engine between them. The engine was water-cooled with the radiator surrounding the cylinder. It had a surface carburettor and coil ignition. Transmission was by chain to a countershaft and then by a second chain to the rear small wheel. For steering it had braced forks to the front assembly, and further linkage for turning the front wheel. Forward motion was relatively easy but reverse was similar to backing a car with a trailer attached.