In April 1903 the brothers William John and Sidney Charles Graham of Middlesex patented a method of carrying a passenger on the side of the motorcycle. Trafalgar was one of the first to advertise a "Flexible Side Carriage", which they built under licence to the Graham brothers in 1903. Ariel did so around the same time.
"Messrs. Graham Sidecars, of Kingston-on-Thames, exhibited an all-metal trader's body fitted to their well-known and immensely strong sidecar frame. For this body the centre of gravity is brought lower than usual, thus giving greater stability when bulky loads have to be carried. This outfit is also easily convertible for pleasure uses."
Commercial Motor Magazine. 1925
"R. A. Graham, B.Sc. (Engineering) of 14 Cambridge Road, Kingston-on-Thames. Telephone: Kingston 2824
1929 Listed Exhibitor. Manufacturer of Graham Sidecars, Folding Chairs, Tables to match, Toboggans, Fire Extinguishers. (Stand No. PP.20)"
Sources: occhiolungo, fahrtraum.at, Graces Guide.
