John BOSMAN -- Power Plant -- US Patent # 1710721 -- Popular
Science ( April 1927 )

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**John A. BOSMANS**

**Engine**



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***Popular Science* ( April 1927 )**

**"Amazing Engine Has Fewer Parts"**

Of extraordinary design, a  new auto motor having no
connecting rods, wrist pins, or crank case, and said to allow 20
% more mileage to a gallon of gas, has just been invented by
John A. Bosmans, of Brooklyn NY. Owing to its simplified
construction, Bosmans says, its efficiency is doubled; and he
can take the motor apart, remove the crank shaft and put it all
together again in 30 minutes. The same simplicity, he declares,
will decrease its cost of manufacture to a fraction of the
present cost of an equally powerful engine.

Eight cylinders are set in horizontal blocks on opposite sides
of the motor. There are 4 double-headed pistons, each working in
two cylinders! As one cylinder fires, the gas in the opposite
one is compressed, and a moment later the cycle is reversed.
Power reaches the crank shaft through a 4-sided bearing that
slides in a diagonal groove within the piston, and each
revolving bend of the crank shaft is entirely contained inside
the hollow piston shell.

More than twice as long as in ordinary motors, the unusual
piston cannot wobble as much as a short one within the cylinder
walls: hence it will not wear down the piston chambers and make
regrinding necessary. Absence of vibrations and unusual fuel
economy are other results claimed for this remarkable
construction.

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**Power Plant**   
**US1710721**



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