London General trialled these machines in 1929 – believed to be at Cricklewood Garage on route 16. Similar machines were also trialled on the associated Metropolitan Electric and London United Tramways.
The fare, class and stage boarded were indicated by punch holes. It is not clear whether the machine registered how many of each fare value were issued, or whether accounting required the ‘dots’ to be counted.
A modified version of the machines were also used by mobile ‘Tote’ staff at race-courses.
A photo (probably posed) exists in the London Transport Museum’s collection – http://www.ltmcollection.org/photos/photo/link.html?IXinv=1999/11674
Photograph and Copy contributed by Jon