Oh, of course, sir, you will have your joke! I am glad you are not offended. You see ladies don't always understand these matters. Mrs. Errington was a little severe on us when she paid the account yesterday. At least, so my cashier said. Sophia. My heart beats so, I shall expire. The A.B.C. 鈥榃asp II,鈥?made by Walton Motors, Limited, is a seven-cylinder radial, air-cooled engine, the cylinders having a bore of 4鈥?5 inches and stroke 6鈥?5 inches. The normal brake horse-power at 1,650467 revolutions is 160, and the maximum 200 at a speed of 1,850 revolutions per minute. Lubrication is by means of two rotary pumps, one feeding through the hollow crankshaft to the crank pin, giving centrifugal feed to big end and thence splash oiling, and one feeding to the nose of the engine, dropping on to the cams and forming a permanent sump for the gears on the bottom of the engine nose. Two carburettors are fitted, and two two-spark magnetos, running at one and three-quarters engine speed. The total weight of this engine is 350 lbs., or 1鈥?5 lbs. per horse-power. Oil consumption at 1,850 revolutions is 鈥?3 pints per horse-power per hour, and petrol consumption is 鈥?6 pints per horse-power per hour. The engine thus shows as very economical in consumption, as well as very light in weight. Maxfield brought his two clenched fists heavily down on the table, and half raised himself in his chair. "Stop!" said he. "Who are you talking of?" It's not a thing to decide upon all in a moment, Rhoda, said her father. After a dissertation upon the history and strength of the condor, and on the differences between the weights of birds, he says: 鈥楾he following observations upon the wonderful difference in the weight of some birds, with their apparent means of supporting it in their flight, may tend to remove some prejudices against my plan from the minds of some of my readers. The weight of the humming-bird is one drachm, that of the condor not less than four stone. Now, if we reduce four stone into drachms we shall find the condor is 14,336 times as heavy as the humming-bird. What an amazing disproportion of weight! Yet by the same mechanical use of its wings the condor can overcome the specific gravity of its body with as much ease as the little humming-bird. But this is not all. We are informed that this enormous bird possesses a power in its wings, so far exceeding what is necessary for its own conveyance through the air, that it can take up and fly away with a whole sheep in its talons, with as much51 ease as an eagle would carry off, in the same manner, a hare or a rabbit. This we may readily give credit to, from the known fact of our little kestrel and the sparrowhawk frequently flying off with a partridge, which is nearly three times the weight of these rapacious little birds.鈥? 欧美黄色视频_很鲁很鲁在线手机视频_啪啪啪网站免费_高清无码中文 In 1872 Dupuy de Lome, commissioned by the French government, built a dirigible which he proposed to drive by man-power鈥攊t was anticipated that the vessel would be of use in the siege of Paris, but it was not actually tested till after the conclusion of the war. The length of this vessel was 118 feet, its greatest diameter 49 feet, the ends being pointed, and the motive power was by a propeller which was revolved by the efforts of eight men. The vessel attained to337 about the same speed as Giffard鈥檚 steam-driven airship; it was capable of carrying fourteen men, who, apart from these engaged in driving the propeller, had to manipulate the pumps which controlled the air bags inside the gas envelope. 鈥楴ow, there are only two ways of learning to ride a fractious horse: one is to get on him and learn by actual practice how each motion and trick may be best met; the other is to sit on a fence and watch the beast awhile, and then retire to the house and at leisure figure out the best way of overcoming his jumps and kicks. The latter system is the safer, but the former, on the whole, turns out the larger proportion of good riders. It is very much the same in learning to ride a flying machine; if you are looking for perfect safety you will do well to sit on a fence and watch the birds, but if you really wish to learn you must mount a machine and become acquainted with its tricks by actual trial. The balancing of a gliding or flying machine is very simple in theory. It merely consists in causing the centre of pressure to coincide with the centre of gravity.鈥? He ends by saying that no city would be proof32 against surprise, while the aerial ship could set fire to vessels at sea, and destroy houses, fortresses, and cities by fire balls and bombs. In fact, at the end of his treatise on the subject, he furnishes a pretty complete r茅sum茅 of the activities of German Zeppelins. But, Ancram!鈥攚hat's the use? Why on earth should you fly off in this way? I'm sure it won't do! Do you suppose for an instant that Aunt Belinda will let you get at him? Bella, the elder girl, was pretty and of gracious manners, with dark eyes, and with a capacity for dressing herself well upon the very moderate allowance which her father was able to bestow. Fanny, the next sister, though not at all handsome, had also soft dark eyes, and a peculiarly sweet disposition; and she too dressed nicely. It was commonly said amongst themselves that Fanny was 鈥榯he gentle sister,鈥?and that Charlotte was 鈥榯he clever heroic sister.鈥?But Charlotte was not gifted with the art of dressing well.