But nought compar'd to Heav'n's unbounded Joy, Having reached the present stage of advancement in its development, it would seem highly desirable, before laying down the investigation, to obtain conclusive proof of the possibility of free flight, not only because there are excellent reasons to hope for success, but because it marks the end of a definite step toward the attainment of the final goal. 鈥楢mritsar, Feb. 23, 1878.鈥擧ere I am again in dear old Amritsar.... I know that you will be curious to hear how the Batala school plan progresses. Well, we are waiting to hear what our saintly new Bishop says to it. In a matter of such importance it is right to wait for the advice of such an Apostolic man.... I wait passively. There is plenty of work for me at Amritsar, more than I can do at all properly.... pk10规律分享心得 Having reached the present stage of advancement in its development, it would seem highly desirable, before laying down the investigation, to obtain conclusive proof of the possibility of free flight, not only because there are excellent reasons to hope for success, but because it marks the end of a definite step toward the attainment of the final goal. VII ENGINES OF THE WAR PERIOD 鈥業 need not tell you that the mountains are very beautiful; especially, to my mind, when a white cloud, which has been, as it were, quite blotting them out, is lifted, and one beholds the glorious peaks and wooded valleys, lovely in the bright sunshine. It reminds one of the American Poet鈥檚 striking lines on a yet loftier theme,鈥? CHAPTER XXIII. 鈥業 was in utter solitude, under the light of the moon. Not in silence, for the sound of many waters is unceasing. I suppose that for thousands of years Niagara has been praising her Creator, as she does now. The sound is not at all noisy; on the contrary, it does not disturb conversation, which surprises me. The foregoing brief鈥攁nd necessarily incomplete鈥攕urvey of the early British group of fliers has taken us far beyond some of the great events of the early days of successful flight, and it is necessary to go back to certain landmarks in the history of aviation, first of which is the great meeting at Rheims in 1909. Wilbur Wright had come to Europe, and, flying at Le Mans and Pau鈥攊t was on August 8th, 1908, that Wilbur Wright made the first of his ascents in Europe鈥攈ad stimulated public interest in flying in France to a very great degree. Meanwhile, Orville Wright, flying at Fort Meyer, U.S.A., with Lieutenant Selfridge as a passenger, sustained an accident which very nearly cost him his life through the transmission gear of the motor breaking. Selfridge was killed and Orville Wright was severely injured鈥攊t was the first fatal accident with a Wright machine. It is a singular thing, but I have remarked very often that men in general are apt to think pretty girls too good for anybody but themselves! American enterprise in the construction of the rotary type is perhaps best illustrated in the 鈥楪yro鈥?engine; this was first constructed with inlet valves in the heads of the pistons, after the Gnome pattern, the exhaust valves being in the heads of the cylinders. The inlet valve in the crown of each piston was mechanically operated in a very ingenious manner by the oscillation of the connecting-rod. The Gyro-Duplex engine superseded this original design, and a small cross-section illustration of this is appended. It is constructed in seven and nine-cylinder sizes, with a power range of from 50 to 100 horse-power; with the largest size the low weight of 2鈥? lbs. per horse-power is reached. The design is of considerable interest to the internal combustion engineer, for it embodies a piston valve for controlling auxiliary exhaust ports, which also acts as the inlet valve to the cylinder. The438 piston uncovers the auxiliary ports when it reaches the bottom of its stroke, and at the end of the power stroke the piston is in such a position that the exhaust can escape over the top of it. The exhaust valve in the cylinder head is then opened by means of the push-rod and rocker, and is held open until the piston has completed its upward stroke and returned through more than half its subsequent return stroke. When the exhaust valve closes, the cylinder has a charge of fresh air, drawn in through the exhaust valve, and the further motion of the piston causes a partial vacuum; by the time the piston reaches bottom dead centre the piston-valve has moved up to give communication between the cylinder and the crank case, therefore the mixture is drawn into the cylinder. Both the piston valve and exhaust valve are operated by cams formed on the one casting, which rotates at seven-eighths engine speed for the seven-cylinder type, and nine-tenths engine speed for the nine-cylinder engines. Each of these cams has four or five points respectively, to suit the number of cylinders. All these bright Spirits, whose each Single Voice, 鈥楯une 22.... I am to start to-day for Dalhousie. Feel old and rather worn out. If I live to 1892 must not stay down so long....鈥? Having reached the present stage of advancement in its development, it would seem highly desirable, before laying down the investigation, to obtain conclusive proof of the possibility of free flight, not only because there are excellent reasons to hope for success, but because it marks the end of a definite step toward the attainment of the final goal. The final day of the meeting provided a further record in the quarter million spectators who turned up to witness the close of the great week. Bleriot, turning out in the morning, made a landing in some such fashion as flooded the carburettor and caused it to catch fire. Bleriot himself was badly burned, since the petrol tank burst and, in the end, only the metal parts of the machine were left. Glenn Curtis tried to beat Bleriot鈥檚 time for a lap of the course, but failed. In the evening, Farman and Latham went out and up in great circles, Farman cleaving his way upward in what at the time counted for a huge machine, on circles of about a mile diameter. His first round took him level with the top of the stands, and, in his second, he circled the captive balloon anchored in the middle of the grounds. After another circle, he came down on a long glide, when Latham鈥檚 lean Antoinette monoplane went up in circles more graceful than those of Farman. 鈥楽wiftly it rose and swept round close to the balloon, veered round to the hangars, and out over to the Rheims road. Back it came high over the stands, the people craning their necks as the shrill cry of the engine drew nearer and nearer behind the stands. Then of a sudden, the little form appeared away up in the deep twilight blue vault of the sky, heading straight as an arrow for the anchored balloon. Over it, and high, high above it went the Antoinette, seemingly higher by many feet than the Farman machine. Then, wheeling in a long sweep to the left, Latham steered his machine round past the205 stands, where the people, their nerve-tension released on seeing the machine descending from its perilous height of 500 feet, shouted their frenzied acclamations to the hero of the meeting.