In OTL, Dr. Rudolph Diesel invented the engine that is named for him around 1893. But, suppose he didn't invent it, because someone else already had.
How much earlier could such a device (which wouldn't have been called 'Diesel', of course) have been invented?
How would this have changed the world?
How much earlier could such a device (which wouldn't have been called 'Diesel', of course) have been invented?
How would this have changed the world?