1. The Man Behind the Machine
Nicolaus was a German inventor
Born in 1832 in Holzhausen an der Haide
His design was the first 4 stroke ICE to have any kind of practicality

2. The Otto Engine is a single cylinder 4 stroke ICE.
The Machine
The Otto Engine is a single cylinder 4 stroke ICE.
It is one of the first engines to use a spark plug which is used to ingnite compressed air/fuel

3. Any 4 stroke engine is an Otto Engine
The Otto Cycle
Any 4 stroke engine is an Otto Engine
The 4 strokes are: Intake, Compression, Combustion/Power, Exhaust.
The cycle is: 1-2: adiabatic compression 2-3: heat addition at constant volume 3-4: adiabatic expansion and rejection of heat at constant volume

4. http://en.wikipedia.org/wiki/Otto_cycle#The _Otto_cycle
Bibliography
_Otto_cycle