The Otto and Langen engine is a free piston engine than has a very clever clutch to control the piston. When in operation, the piston sounds like it is trying to leave the building. The clutch mechanism is a bit noisy, but is very sure in operation. The only one I knew of was operating a sack hoist in a flour mill. Dr, Otto licensed his patent to several companies, including the Crossley Brothers in Manchester, England. The Otto engines as manufactured by Crossleys, employed the sliding flame
ignition system, which worked well enough but required careful maintenance to keep the slide gastight. By 1888, the ignition
was via a hot tube and timing was controlled by a valve. Shortly after this Crossley introduced their High Speed Electric light
engine.
One of these new style engines was exhibited at the November 1892 Agricultural Show at the Royal Dublin Society show
grounds in Dublin, Ireland. This engine had two heavy flywheels and ran 240 RPM vs the standard 160 RPM. It was rated
at 3 Nominal Horse Power, at handy way to avoid the taxman by underrating the actual horsepower, a dodge that was very
popular with traction engine manufactures. Despite the rather low compression ratio of about four to one, it still managed
about twelve horsepower at operating speed. The fuel was coal gas from the gasworks in Barrow street, but it would operate
on Dowson Gas (Producer Gas) as well. After the show closed, it was sold to a Pork butcher in Camden street, Dublin. For the next sixty-five years it ran a line shaft and when the last family member died the shop was shut down and sold to a developer.
In 1969, the developer, who owned the printing works across from my friend's machine shop, asked if we could remove an
old piece of iron that was impeding his remodeling work. Upon examination, we decided to run the engine before moving it
to our shop, a few blocks away. The gas meter had been removed, but we found an old bicycle in the loft and used an inner
tube to bridge the pipes and get the gas flowing. We ran the engine for about one hour before shutting it down and taking
it a part. It was complete with the antifluctuator, used to protect any gas lights on the system. The only item we could not
remove was the exhaust pot which was covered in concrete. The flywheels were carefully removed from the engine and
slowly rolled along the street to our shop, followed by the rest of the engine on the lorry. In 1973, on a visit to Dublin, I
bought the engine from my friend and shipped it to Arizona where it has been in storage. Now that I have retired, I will have
the time to work on not only my various Hendey projects, but the old Crossley as well. Hopefully, in the not to distant future, it will be back running the lineshaft in my shop.
Hendeyman