For those of you who wanted some technical details about my last post on Engineering as it used to be.
What you are seeing in this old and grainy movie, is the upper pistons and cross heads of a Doxford engine moving up and down.
This is the upper piston reciprocating (Big word) attached by side rods conveying power to the crankshaft. At the same time there is a lower piston travelling in a reverse direction. When at their closest point, Heavy fuel oil is injected in to the space which ignites, and forces the pistons apart. The running speed varied from about 30 RPM to 120 RPM. Consider that your diesel driven car’s engine usually runs between 1000 RPM and 4500 RPM.
Just so you know.