The old Stirling “air” engine (power from expanding hot air) was redesigned by the big and smart Philips electrical company at Eindhoven, in The Netherlands.

The old Stirling “air” engine (originally patented by Robert and James Stirling of Scotland in 1816) was born in the wrong century. Its principle (power from expanding hot air) was good, but the crude materials and engineering methods of the time made it too clumsy and inefficient to be widely…