I told him to come to you. Father knows you are one of the few people with whom Mr. Diamond has associated in Whitford. CHAPTER XV. There is one very remarkable class of laws yet to be considered. Certain experiments detailed in his work were made to ascertain the size of the surface necessary for the support of any given weight. He accepted a truism of to-day in pointing out that in any matters connected with aerial investigation, theory and practice are as widely apart as the poles. Inclined at first to favour the helicopter principle, he finally rejected this in favour of the plane, with which he made numerous experiments. During these, he ascertained the peculiar advantages of curved surfaces, and saw the necessity of providing both vertical and horizontal rudders in order to admit of side steering as well as the control of ascent and descent, and for preserving equilibrium. He may be said to have anticipated the work of Lilienthal and Pilcher, since he constructed and experimented with a fixed surface glider. 鈥業t was beautiful,鈥?he wrote concerning this, 鈥榯o see this noble white bird sailing majestically from the top of a hill to any given point of the plain below it with perfect steadiness and safety, according to the set of its rudder, merely by its own weight, descending at an angle of about eight degrees with the horizon.鈥? 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. Mrs. Jud. What strange non.... 人人超人人超碰超国产 Oct. 16th, 1852. Mr. Errington, said the surveyor, "I am speaking to you, not officially, but confidentially, and as man to man. I have been having a little conversation with Mr. Gibbs鈥攚ho seems to have none but good feeling towards you, but who鈥攊n short, I think it is not needful to be more explicit. I advise you in all friendliness to be stern and decisive in keeping every person out of this office except such as have recognised business to be here. If further trouble arises, I shall have to do my duty, and make my report without respect of any persons whatsoever." One of the chief problems in connection with the construction of a full-sized apparatus was that of the construction of an engine, for it was realised from the first that a steam power plant for a full-sized machine could only be constructed in such a way as to make it a constant menace to the machine which it was to propel. By this time (1898) the internal combustion engine had so far advanced as to convince Langley that it formed the best power plant available. A contract was made for the delivery of a twelve horse-power engine to weigh not more than a hundred pounds, but this contract was never completed, and it fell to Charles M. Manly to design the five-cylinder radial engine, of which a brief account is included in the section of this work devoted to aero engines, as the power plant for the Langley machine.