From the MEWS archive is this model of an Associated Manufacturers’ Company (Amanco) Hired Man gas engine from around 1913. The model design is by Paul Breisch in the USA in 1:3 scale with a bore of 1.25” and stroke 1.625”.

It has hit and miss speed governing in which the exhaust valve is held open if the engine over-speeds. It has low tension ignition which relies on the spark caused by the back electromagnetic field generated when current flowing through a coil is interrupted by a contact breaker located in in the side of the combustion  chamber.

Construction occupied around 350 hours.