In 1929 the then chairman Percy Martin initiated the development of a new form of transmission. Fluid-Flywheel transmission enable the driver to engage and disengage the transmission without the use of a clutch. The transmission also allowed the car to travel at very slow speeds. A difficult thing to achieve with a crash gear box. To demostrate and publicise the system a series of films was commissioned. 'Bringing up Grandma', 'Pa Puts His Foot Down' and 'Roadwords'. Using actors and animation, the films featured Daimlers, Lanchesters and BSAs fitted with the transmission. In 'Roadwords' there is a paricular memorable scene where a test driver engages 1st gear, sets the car running, then gets out of the car, walks round, gets in and continues driving.