The principal companions of Frederick at Reinsberg were gay, pleasure-loving men. Among them were Major Keyserling, a thoughtless young man, full of vivacity, and of very agreeable manners; and M. Jordan, a French young gentleman, formerly a168 preacher, very amiable, and an author of considerable note. M. Jordan was devotedly attached to the prince, and continued so through life. He gives the following testimony to the good qualities of Frederick: 鈥榃hen a bird which is in equilibrium throws the centre of resistance of the wings behind the centre of gravity, then such a bird will descend with its head downward. This bird which finds itself in equilibrium shall have the centre of resistance of the wings more forward than the bird鈥檚 centre of gravity; then such a bird will fall with its tail turned toward the earth.鈥? 手机彩票票123导航 CHAPTER XIII. Horatia. Oh, it is not fit to receive you, Sir. The chimney tumbled in during the last gale.... 鈥淢y dear General Von Zastrow,鈥擳he misfortune which has befallen me is very grievous. But what consoles me in it is to see by your letter that you have behaved like a brave officer, and that neither you nor your garrison have brought disgrace or reproach upon yourselves. I am your well-affectioned king. 鈥業 cannot pretend to offer that most common excuse of Authors that their works have been written in great haste and consequently under great disadvantages. I have been a considerable time about my little performance, and its defects are not owing to want of care or attention on my part. A few days after this interview, the Dutch embassador, General Ginckel, arrived with the Resolution from the English and Dutch courts, demanding that the king should evacuate Silesia. Lord Hyndford was much embarrassed, apprehending that the presentation of the summons at that time would work only mischief. He persuaded General Ginckel to delay the presentation until he could send a courier to England for instructions. In a fortnight the courier returned with the order that the Resolution was immediately to be presented to his Prussian majesty. All applications to be made to D. E. Colombine, Esquire, 8 Carlton Chambers, Regent Street. 67 Henson, who had spent a considerable amount of money in these experimental constructions, consoled himself for failure by venturing into matrimony; in 1849 he went to America, leaving Stringfellow to continue experimenting alone. From 1846 to 1848 Stringfellow worked on what is really an epoch-making item in the history of aeronautics鈥攖he first engine-driven aeroplane which actually flew. The machine in question had a 10 foot span, and was 2 ft. across in the widest part of the wing; the length of tail was 3 ft. 6 ins., and the span of tail in the widest part 22 ins., the total sustaining area being about 14 sq. ft. The motive power consisted of an engine with a cylinder of three-quarter inch diameter and a two-inch stroke; between this and the crank shaft was a bevelled gear giving three revolutions of the propellers to every stroke of the engine; the propellers, right and left screw, were four-bladed and 16 inches in diameter. The total weight of the model with engine was 8 lbs. Its successful flight is ascribed to the fact that Stringfellow curved the wings, giving them rigid front edges and flexible trailing edges, as suggested long before both by Da Vinci and Borelli, but never before put into practice.