Naval Engineers, made an extensive set of experiments on a Sturterant centrifugal blower delivering air into the atmosphere at large. The blower w~ts situated in the machine shop of the New York Navy Yard, and was driven by an independent oscillating non-condensing engine articulated directly to it. It received its airfrom the still atmosphere of a very large room, and delivered its air into the same. The writer has taken from Passed Assistant Engineer Barry's experiments, the three quantities

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... hat the latter directly determined for each experimental speed of blower, namely, the pressure of the air delivered, the velocity of the air delivered, and the number of revolutions made by the blower per minute, and has deduced from them the results which will be found in the following pages, adding also the necessary dimensions and descriptions of the blower and apparatus, in order that the reader may clearly comprehend the conditions and limitations of the trials. The experiments were made with the blower driven at velocities varying from 1,25o to i ,95o revolutions per minute. They serve within their limits to determine the velocity in feet per minute with which, at different rotary speeds of the blower, the air was discharged into the atmosphere. Also, th~ volume and weight of air delivered into the atmosphere per revolution of the blower, and whether that volume and weight were affected by the rotary speed of the blower, and if so, in what degree. Also, to ascertain the pressures produced by the impacts of the discharged airat different velocities, as shown by the respective heights of the columns of water equilibrated by these impacts and measured between