. Journal of Electricity . Tel Und Tel Co Portland, Oregon, USA, USA, USA, USA, USA, USA, USA, USA, USA, USA, USA, USA, USA, USA, USA, USA, USA, USA, USA, USA, USA, USA, USA, USA, USA, USA, USA, USA, USA, USA, USA, USA, USA, USA, USA, USA, USA, USA, USA, USA, USA J. W., Kootenai Power Co Coeur dAlene, Idaho Wakeman, Mr. Und Mrs. H. E., Portland EY. Lt. & Pr. Co Portland, Oregon, USA, USA, USA, USA, USA, USA, USA, USA, USA, USA, USA, USA, USA, USA. H. G., Wash. Elec. Sup
2103 x 1188 px | 35,6 x 20,1 cm | 14 x 7,9 inches | 150dpi
Weitere Informationen:
Dieses Bild ist ein gemeinfreies Bild. Dies bedeutet, dass entweder das Urheberrecht dafür abgelaufen ist oder der Inhaber des Bildes auf sein Urheberrecht verzichtet hat. Alamy berechnet Ihnen eine Gebühr für den Zugriff auf die hochauflösende Kopie des Bildes.
Dieses Bild kann kleinere Mängel aufweisen, da es sich um ein historisches Bild oder ein Reportagebild handel
. 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
