Pythagoras-Drott hot bulb engine in generator room

This large diesel-driven hot bulb engine was built and installed at the Pythagoras-Drott mechanical works in 1932. It has been used to drive a power generator, which still works and is able to produce electricity for the factory. In this recording, the generator is not running, so what is heard is mainly sounds of the engine.
Although it is sizeable, this hot bulb engine is actually a medium sized engine to come out of the Pythagoras-Drott engine factory. Larger engines with twice the capacity and effect were also built here.

Machine type: Hot bulb engine
Machine name: “Stormotorn”, the big engine
Manufacturer: Pythagoras-Drott
Year of manufactory: 1932
Place of manufactory: Pythagoras-Drott mechanical works, Norrtälje, Sweden
Engine effect: 40 hp
Engine rpm: 400 rpm
Fuel: Diesel
Db: 91