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Drahtloser Übersee-Verkehr


    In the first two chapters of the publication under notice, an excellent description is given of the great German radio-station at Nauen and of the receiving station at Geltow, twenty miles south of it. The third chapter discusses the theory of thermionic tubes, and the method of indicating the paths of-the' various currents by marking them in different colours is to be commended. The last chapter on radio-telephony is concerned mainly with modern German practice. In the Appendix a few well-known papers by Howe, Vallauri, etc., are published. The book is clearly printed, and the photographs of the Nauen station and the great lattice towers with their networks of wires show on what a huge scale it is designed.

    Drahtloser Übersee-Verkehr.

    Von Dr. Gustav Eichhorn. Pp. 69 + xx. (Zürich: Beer et Cie, 1921.) 7 francs.

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