. Giornale di elettricità . Tel E Tel Co Portland, Ore. Tinling, Hugh L., Hutton-Tinling Elect. Co Spokane, Wash. Tompkins, R. E., Wash. Water Power Co Colfax, Wash. Tumbull, Ray W., Edison Elect. Appliance Co Portland, Ore. Turner, H. W., Wash. Elect. Supply Co, Wash. Van Eiper, H., T., Seattle, Edison. Appliance, Edison. J. W., Kootenai Power Co Coeur dAlene, Idaho Wakeman, MR. E Sig.ra H. E., Portland Ey. Lt. E Pr. Co Portland, Ore. Wallis, C. E., General Elect. Co Seattle, Washington Welch, J. G., Westinghouse Elect. & Mfg. Co Seattle, Washington. Whitehouse. H. G., Washington, Electra. SUP

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. Journal of electricity . Tel. & Tel. Co Portland, Ore. Tinling, Hugh L., Hutton-Tinling Elec. Co Spokane, Wash. Tompkins, R. E., Wash. Water Power Co Colfax, Wash. Tumbull, Ray W., Edison Elec. Appliance Co Portland, Ore. Turner, H. W., Wash. Elec. Supply Co Spokane, Wash. Van Eiper, H. T., Edison Elec. Appliance Co Seattle, Wash. Voellmeck, J. W., Kootenai Power Co Coeur dAlene, Idaho Wakeman, Mr. and Mrs. H. E., Portland Ey. Lt. & Pr. Co Portland, Ore. Wallis, C. E., General Elec. Co Seattle, Wash. Welch, J. G., Westinghouse Elec. & Mfg. Co Seattle, Wash. Whitehouse. H. G., Wash. Elec. Supply Co Spokane, Wash. Williams, H. E., Stevens County Pr. & Lt. Co Colville, Wash. Wilson, G. L., Wash.-Idaho Water, Lt. & Pr. Co Lewiston, Idaho WoUaber, Mr. and Mrs. A. B., So. Cal. Edison Go Pasadena, Cal. Worth, Eoy, Pacific States Elec. Co Seattle, Wash. I ENGINEERS OF YESTERDAY | p By A. L. Jordan = I 21. Prony. | I What is the simplest appliance for measuring the horse- |j power of an engine? | I. = Diagram of the friction brake ^ I Baron Gaspard Clair Francois Marie Riche de Prony i I (1755-1839) was a famous French engineer. He became | I Professor of Mathematics at one engineering school, and j I later the director of another, was engaged in important | I work such as the protection of certain districts from | I river flood-waters, became a Baron in 1828, a Peer in | I 1835 and yet we would never have heard of him but | I for his invention in 1800 of the useful friction brake. | I This was originally two wooden bea, ms clamped to the | I engine shaft, a known weight which could be moved 1 j along the arm of one beam, and some means of finding | j the revolutions per minute of the shaft. From these | I quantities the brake horsepower could be determined, j j Many improvements (means of carrying away the heat j j produced, of preventing vibration, etc.) have been made, | j notably those by Poncelet, Lord Kelvin, James Thorn- | I son, Alden, and Ayrton & Perry; Froude and

Parole chiave associate all'immagine

• bookcentury1900
• bookdecade1910
• booksubjectelectricity
• bookyear