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Command area on board a Zeppelin, German air fleet, First World War, 1917. Artist: Felix SchwormstadtCommand area on board a Zeppelin, German air fleet, First World War, 1917
Communicating by speaking tube, 1882Speaking tube, 1882. A cross-section of a ship, showing how communication between the bridge (top) and the rest of the vessel took place
Communication by speaking tube, c1850. A waiter serving clients in a restaurant, speaking to chefs at work in the kitchen on the floor below, using a speaking tube
