Setright Machine
Appearance
It is a machine operated by a conductor/guard for issuing bus tickets from a blank paper roll.
The Setright could print any value and could easily deal with changes in fares.
A set of concentric dials on the top was used to set the value and levers set "Adult", "Child", etc. and "In" or "Out" to indicate which journey.
The machines were reliable and unlikely to jam. They make a distinctive whirring noise as each ticket is issued.