Engineering Wonders of the World
Volume III

32 ENGINEERING WONDERS OF THE WORLD. Fig. 3.—THE GREEN ENGINE. TOP VIEW. The cam shaft and rocking levers for operating the valves are enclosed in an oil-tight casing. crank-case itself—a very de- sirable feature. Space is left between the bolts and the columns through which they pass for conducting lubricating oil from a force pump to the bearings. When th© engine is running the only visible point in motion is the fly-wheel. An 80 horse-power eight- cylinder V type engine com- prising the same features was supplied to the War Office for a dirigible balloon. Our list must include the Anzani three-cylinder engine, as it was one of these that outer surface of the rubber. Interchangeable valves, in detachable cages, fastened down on the valve ports by internal screwed locking rings, are used. All joints round pipes and ports are made water-tight by pressing the copper jacket against the metal of the cylinder by suitably shaped screwed nipples and washers. The valve-operating cam shaft runs along the top of the cylinders, and is driven through a vertical spindle (seen on the left) and bevel gear. An oil- retaining casing, which encloses the crank shaft, affords bear- ings for the eight rocking levers for operating the valves. The casing is divided into two halves vertically, and can be rotated on the shaft when holding-down clamps have been undone, so giving easy access to the valves. (Fig. 3.) Tho main bearings are con- nected directly to the cylinders by vertical bolts passing through columns in the cross divisions of the upper half of the alu- minium crank-case. The driv- ing stress is thus taken off the brought M. Blériot safely across the Channel in his memorable flight of July 25, 1909. The cylinders, Anzani of 100 mm. bore and 150 mm. stroke, radiate at angles of 60° from the upper half of the crank-case. The draught from the propeller serves to carry off excess heat, so water-cooling is here dispensed with. The exhaust valves are assisted in scavenging by Fig. 4.—THE THREE-CYLINDER 25 HORSE-POWER ANZANI ENGINE, WHICH TOOK M. BLERIOT ACROSS THE CHANNEL. {Photo, Topical.)