11. The engine cooling is via liquid in a water jacket . 12. Water jacket cooling systems were largely abandoned as unnecessary.13. The inner and outer pairs of tubes were joined to form two double-walled water jackets . 14. The water-cooled M1917 was inappropriate due to weight and the vulnerability of the water jacket . 15. The machine that Wilkinson showed to him was cooled by air, instead of a water jacket . 16. It was difficult to cool this plug, as the water jacket didn't extend into the plug. 17. The cylinder was horizontal, pointing rearward, and was cast from iron with a copper water jacket . 18. Individual cylinders with sheet metal water jackets shared the aluminium alloy heads, four to a bank. 19. From here the hot gases travelled up through the boiler tubes which pass through the water jacket . 20. Otto engines use a flowing water jacket around the cylinder wall, similar to modern engine cooling systems.
