. Appendix to Captain Parry's journal of a second voyage [microform] : for the discovery of a north-west passage from the Atlantic to the Pacific, performed in His Majesty's ships Fury and Hecla in the years 1821-22-23. Science; Botany; Sciences; Botanique. T ON THE VELOCITY OV SOUND. 239 The following are the results of the foregoing observations, arranged according to their temperatures, and also upon the supposition that the accuracy of each day's observations, is in the joi:>t ratio of the number of guns fired, and the number of observers. Tbermr, Falir. Heu Velocity per Sccood. o - 41.
. Appendix to Captain Parry's journal of a second voyage [microform] : for the discovery of a north-west passage from the Atlantic to the Pacific, performed in His Majesty's ships Fury and Hecla in the years 1821-22-23. Science; Botany; Sciences; Botanique. T ON THE VELOCITY OV SOUND. 239 The following are the results of the foregoing observations, arranged according to their temperatures, and also upon the supposition that the accuracy of each day's observations, is in the joi:>t ratio of the number of guns fired, and the number of observers. Tbermr, Falir. Heu Velocity per Sccood. o - feet. - â - â - â - â + By comparing the observations made at the temperature cf â 41°.3, with those at + 33°.3, it appears that, between these limits, the velocity of sound per second diminishes, the temperature of the atmosphere di- minishes, at the rate of foot, for each degree of temperature. From experiments made by Mr. Goldingham at Madras, during the summer months, it appears that at + 87° Fahrenheit, the velocity per second feet., by comparing this result with the observations at â , the velocity is dimi- nished at the rate of foot, for each degree of temperature, suprjsing the change of velocity proportional to the change in the temperature. The Experiments on the 9th February, 1822, were attended with a singular circumstance, which wasâthe officers' word of command "fire," was several times distinctly heard both by Captain Parry and myself, about one beat of the chronometer after the report of the gun; from which it would appear, that the velocity of sound depended in some measure upon its intensity. The word " tire" was never heard during any of the other experiments; upon this oc- casion the night was calm and clear, the thermometer 25° below zero, the barometer inches, which was lower thau it had ever been observed before at Wint
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