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The earliest experimenters thought that oars might be employed to propel and direct a balloon. The immediate failure of all endeavours of this sort, led them, still pursuing the analogy between a balloon and a ship at sea, to try to navigate the air with sails. This again proved futile. It is impossible for a balloon, or airship to "tack" or manoeuvre in any way by sail power.
"The fact is," said Winter, "Maitland slept soundly through the whole affair, and it wouldn't be sporting to give him away." "I see " began Mannering. Winter deftly changed the subject. "What puzzles me," he said, "is the kind of motor the fellow employed to propel his car. I know of nothing at present on the market anything like so effective. I've seen 'em all."
"As you have to pass through but little air," said Deepwaters, "I should suggest a short-stroke cylinder of large diameter, with a flat base and dome roof, composed of aluminum, or, still better, of glucinum or beryllium as it is sometimes called, which is twice as good a conductor of electricity as aluminum, four times as strong, and is the lightest of all known metals, having a specific gravity of only two, which last property will be of great use to you, for of course the more weight you have to propel the more apergetic repulsion you will have to develop."
His reasoning powers were completely overturned; he continued to buffet the waves with wild energy, and to strain every fiber of his being in the effort to propel himself through the water, long after the boat was hopelessly beyond reach.
The tide was almost at its height, but even then the current was so strong that they went across almost sideways, and Jeanne heard her companion's breath grow shorter and shorter, as with powerful strokes she did her best to guide and propel the clumsy craft. "We are going out toward the sea," Jeanne faltered. "It is getting wider and wider." She flashed her torch across the dark waters.
Some small boat, evidently, but of heavy build, for it takes a vigorous hand to propel it, and now there is a grinding of oars on thole-pins. Strange that it is not yet seen, for the sound is near. Look! Is that a shadow crossing that wrinkle of starlight in the water? The oars have stopped, and there is no wind to make that sound of a sigh. Ho, Rambout Van Dam! Is it you?
Other species propel themselves in rapid, gliding, and continued flight by means of long, narrow, and pointed wings, like the swifts, swallows, and goatsuckers, while many others, notably herons, hawks, vultures, and eagles, are distinguished by a vast alar expansion in proportion to their weight, and hence are able to sustain themselves in the air by sailing, with only a slight stroke at rare intervals.
There was every reason why he should fall overboard at each stroke, as he stood to propel the boat in the gondolier fashion, except that he never yet had done so. It was sometimes his fortune to be caught on the shallows by the falling tide; but on that day he safely explored the lagoons, and returned promptly at four o'clock to the palace.
He had always kept it hidden in a little thicket of tall reeds, if only the girl had not removed it from its place in his weeks of sickness! He plunged down into the tall tules. Yes, the boat was still in place. It took all the strength of his weakened body to push it out from the reeds into the water. Then he seized the long pole they had sometimes used to propel themselves over the lake.
It had need be, for the shell which it is meant to propel is the size of a small boy and the weight of an average ox, namely 814 lbs. The length of each 38-ton gun is nineteen feet, and its range about 6000 yards. Just try to imagine an ox being propelled through space, between three and four miles, at a rate which I don't recollect, and which doesn't signify.
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