Fotoğraf : Araç, iç dizayn, Kamusal alan, Lumixfz200, Köprü, Trainsignals, Kollar, sinyal kutusu 2400x1807
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The first semaphore signals were controlled by levers situated at the signals. Some early signals protruded from the roof of the controlling signal box. Later, remote operation was effected by levers connected to the signal by single wires (UK), pairs of wires (Continental Europe), or pipes supported on rollers (US). The levers were grouped together in a building known as a "signal box" (UK & Australia) or "interlocking tower" (US). In the UK multiple signal wires were grouped together, and in station areas were commonly routed beneath platform faces just above rail level. The operation of a single signal wire would cause some of the adjacent wires to 'jangle', and this noise was one of the many characteristic sounds of railway travel until the gradual introduction of colour-light signals from the mid 20th century.
Ücretsiz yüksek çözünürlüklü fotoğraf Araç, iç dizayn, Kamusal alan, Lumixfz200, Köprü, Trainsignals, Kollar, sinyal kutusu
, Biriyle çekilmiş DMC-FZ200 01/01 2017 Ile çekilen resim 6.0mm, f/4.0s, 10/1250s, ISO 160
Resim, Creative Commons CC0 kapsamında telif hakları ücretsiz olarak yayınlandı.
Ticari uygulamalarda bile, beğendikleriniz için telif ücretsiz, indirebilir, değiştirebilir, dağıtabilir ve kullanabilirsiniz. Atıf gerekli değildir.











