has made it a practical success.ANIMPROVEDPROXYBRAKE. In an ordinary Prony brake in which the work of a machine Nike Australia is absorbed by the friction of its pulley between two clamps fitting over it and where the power is calculated from the moment of the force tending to turn the clamps and the revolutions of the pulley there are many difficulties. The Christian Louboutin Outlet friction between the clamps and the surface of the pulley varies from different causeschanges in lubrication change of pressure due to heating etcand the readings are most irregular. M. E. Meylan has described a new form of brake simple of use and construction that will measure with considerable accuracy powers from fivehorse power upward. The improvement consists in an automatic arrangement by which the pressure between the clamps is adjusted to compensate for irregularities in lubrication etc. The two clamps are connected by a system of levers so arranged that if there is a tendency for the whole system to revolve in the direction of revolution of the pulley the pressure between the clamps is decreased; if it begins to move in the other direction the pressure increases. This seems a great improvement over the ordinary Prony brake and will be useful in measuring the efficiency of steamengines large electric motors gasengines etc. It cannot however replace transmission dynamometers for many purposes and it is probably not so efficient as the best of the latter class ; the Tatham dynamometer for example. It is an instrument that can be cheaply made and no doubt will be extensively used.HEALTH MATTERS.CholeraInfantum and the Weather. Coach Outlet Store Online ATa meeting of the New York Academy of Medicine held in February Dr. A. Seibert read a paper on cholerainfantum and the weather. The frequency and fatality of this disease in this latitude during the summer months make this subject one of great interest. Coach Outlet Store Online Dr. Seibert includes under the name cholerainfantumall cases of acute gastrointestinal catarrh in children under live years of age. The basis for this paper was an experience of ten yearsto S in the childrens department of the German dispensary of New York City during which time cases of gastrointestinal catarrh had been treated. The disease exists all the year round even in the coldest weather; and the proportionate mortality one in four is just the same in Christian Louboutin Outlet cold as in hot weather. This he claims is shown not only by his own statistics but also by those of the board of health. The largest number of cases however occurred during the summer months. Thus in the ten Julys there were cases and in the ten Augusts . cases while in the ten Februarys there were onlycases. The number of deaths was always much greater in July than in August. Thus during the ten years the number of deaths reported in the city of New York in the Nike Air Max month of July wasand in August onlyIn Julywhen the mean temperature was o the number of cases treated in the dispensary was ; in August Nike Air Max 90 of the same year when the mean temperature was the number of cases was ; and in September when the mean temperature was the Nike Shoes Australia number of cases was . During the summer months it was found that the number of cases and of deaths bore no relation whatever to the rise and fall of temperature and the same was true as regards the range of humidity; so that warm moist weather did not predispose more to the disease than warm dry weather. No relation could be demonstrated between the prevalence of the disease and the rainfall and the same was true in Coach Outlet Store Online regard to the velocity of the aircurrent. According to prevalent opinion the months containing the greatest number of hot days ought to have had the greatest number of cases and of deaths; but there was no evidence supporting this.