. Electrical world. paper presented to the FrenchAssociation for the Advancement of Science. The author has foundthat the bolometer may be used as a detector of waves over a dis-tance of several kilometers. His arrangement, shown in Fig. 2,consists essentially of two identical systems of thin platinum wires,a, b, c, d and a, b, c, d, arranged on the branches of the Wheatstonebridge. M, N, P, Q. The bridge is brought into equilibrium bymeans of the two coils, 5 and S, immersed in the same bath ofpetroleum, and connected together by the sliding contact, A, K. Thevertical wire is connected to a.
. Electrical world. paper presented to the FrenchAssociation for the Advancement of Science. The author has foundthat the bolometer may be used as a detector of waves over a dis-tance of several kilometers. His arrangement, shown in Fig. 2,consists essentially of two identical systems of thin platinum wires,a, b, c, d and a, b, c, d, arranged on the branches of the Wheatstonebridge. M, N, P, Q. The bridge is brought into equilibrium bymeans of the two coils, 5 and S, immersed in the same bath ofpetroleum, and connected together by the sliding contact, A, K. Thevertical wire is connected to a. and c is connected to earth. Asensible galvanometer is used in G. The author uses one of theThomson (Broca-Carpentier) type, the coil of which has a resist-ance equal to that of the other branches of the bridge. The quantitymeasured is the total energy received by the vertical wire. Forother purposes the author has employed a modification of the Ruther-ford-Marconi magnetic detector. Observations are made by a gal-. FIGS. 2 .\ND 3.—electric DETECTOR. vanometer, instead of a telephone. The instrument, shown in , consists essentially of a double detector, each consisting of amagnet, C and C, a primary coil (A and B) with steel wires and asecondary coil (a and b). The magnetic, C and C, are mounted onthe same axle. The coils, a and b, are connected in opposition to asensible ballistic galvanometer, G, or to an electrodynamometer ofthe Bellati type. The arrangements are so made that there existsperfect equilibrium of G during the rotation of the system. Thisequilibrium is destroyed by the arrival of an electric wave if the coil,B, is connected at one end to the vertical wire, and with the otherend to earth.—LEclairage Elec, March 5. March 26, 1904. ELECTRICAL WORLD and ENGINEER. 617 REFERENCE. Type-Printing Telegraph.—Lindlow.—An illustrated descriptionof the Steljes type-printing telegraph, a characteristic feature ofwhich is the use of alternating current.—Ete
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
