 A new 250cc machine with the cams fitted to the vertical tower (with an inspection window to see if oil was reaching the cams - hence the name "Lighthouse") made its first appearance at the 1930 TT where it broke the lap record from a standing start.A road version was made available the following year but the Great Depression killed it and the last Lighthouse was completed in early 1933.It was only available as a 250 although a handful of experimental 350s were built.