London: Constable, 1915. Quarto, green cloth. pp x, 300 + one folding chart. 297 figures in text. Damp stains to rear cover; front cover has one small indentation, damp stain at lower inner corrner, and a bit of wear to lower outer fore tip; yellowing to page edges and to endpapers; owner signature on front free endpaper and following leaf, very small company rubber stamp in upper margin of scattered text pages and to front free endpaper; otherwise a VG tight and clean copy. "Electric power transmission was accomplished in 1882 with the first high voltage transmission between Munich and Miesbach. 1891 saw the construction of the first three-phase alternating current overhead line on the occasion of the International Electricity Exhibition in Frankfurt, between Lauffen and Frankfurt. In 1912 the first 110 kV-overhead power line entered service followed by the first 220 kV-overhead power line in 1923." - wiki. Note: 2 kg parcel, extra shipping will be required.