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In the Vickers system, where the propeller is mounted behind the car, the aeroplane thus operating upon the pusher principle, the nose of the car is occupied by the arm, which is a rifle calibre machine gun fitted upon a special mounting.
During this brief interchange of remarks the noise of the churning little propeller had been drawing nearer; and, after listening intently for a few seconds longer, Douglas whispered hurriedly to his chum, "Slip below quickly, Terry, and bring me up my night-glass; I believe there is something radically wrong about this business."
The speed of the propeller increased as the motor warmed up. Tom ran to his seat and opened the gasoline throttle still more, advancing the spark slightly. The roar increased. The lad darted a look at Eradicate. The colored man's face was like chalk, and he was gripping the upright braces at his side as though his salvation depended on them.
He had invented a screw propeller for boats, and found a splendid market for this type of machinery. He built the steamship Princeton, the first screw steamer with her machinery under the water line.
The passenger could secure himself firmly in his seat, and this was almost unavoidable on landing, or he could move along by means of a little rail and rod to a locker at the stem of the machine, where his personal luggage, his wraps and restoratives were placed, and which also with the seats, served as a makeweight to the parts of the central engine that projected to the propeller at the stern.
Now you ain't a-goin' to think of quittin' Wilton an' leavin' me high an' dry with this propeller idee, are you? 'Twould be a downright shabby trick." Bob smiled into the old man's anxious face. "I can't promise to see you to the finish for I must be back home before many days, or I'll have my whole family down on me. Besides, I have some business in New York to attend to," he said kindly.
At the forward end of the crankshaft there is mounted a master bevel gear on six splines; this bevel floats on the splines against a ball thrust bearing, and, in turn, the thrust is taken by the crank case cover. A stuffing box prevents the loss of lubricant out of the front end of the crank chamber, and an oil thrower ring serves a similar purpose at the propeller end of the crank chamber.
A few cave-black yards, crawled painfully on hands and knees, slipping and slithering along the propeller shaft, brought the leaders to the edge of a wider space. Sievers struck a match, and a well-like, vertical opening was revealed. High overhead towered and threatened an enormous steel crank. Before their feet lay a deep pool of slime. The heat was horrible.
And before he could sufficiently recover from his astonishment to utter a word, the cruiser's bows sank to a level with the water, her stern rose high in the air, with the propeller still spinning round, and in another second she dived forward and disappeared, with the black flag still fluttering from her main truck.
Above and below pandemonium broke out. The old familiar roar of the wind was with them. The Malahini, caught broadside, was pressed down almost on her beam ends as she swung the arc compelled by her anchors. They rounded her into the wind, where she jerked to an even keel. The propeller was thrown on, and the engine took up its work again. "Northwest!"
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