When I checked one of the stereo cards in my collection with Google Lens, I learned that it was the oldest picture in the Phototheque, the image library of the Luxemburg city. The photograph most probably had been made from the railway viaduct Pulvermuhl. That viaduct had been designed and built by the British contractors Waring bros. The Phototheque dated the picture around 1855. That is really very early for a stereo photograph. John Benjamin Dancer invented his stereo camera in 1852. The building on the photograph is a textile factory, that used steampower to produce tricot underwear and used a French patent. The photographer had a very good understanding of the photographic technique.
But how could this early English photographic knowledge be known in Luxemburg city? The explanation can be that the English contractor Waring bros ordered this photograph. Another possibility is that the
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