Stereoscopic photograph of barges berthed at a ghat at Srinagar in Jammu and Kashmir, taken by James Ricalton in c. 1903, from The Underwood Travel Library: Stereoscopic Views of India. This image is described by Ricalton in 'India Through the Stereoscope' (1907), "That farther boat, a curious, long and slender craft belonging to the palace [of the Maharajah of Kashmir], paddled by twenty men and covered by a beautiful canopy, conveys the guest of state [Lady Curzon, the Vicereine] to and from the Residency [a mile upstream]. Now we see her under the canopy of the foremost boat, accompanied by the English Resident. In the second barge is her lady in waiting, with other representatives from the Residency. His Highness has taken leave of the Vicereine and is at this moment starting down the river in the opposite direction in another royal barge." This is one of a series of 100 photographs designed to be viewed through a special binocular viewer, producing a 3D effect. The series was sold together with a book of descriptions and a map with precise locations to enable the 'traveller' to imagine that he was touring around India. Stereoscopic cameras, those with two lenses and the ability to take two photographs at the same time, were introduced in the mid 19th century and revolutionised photography. They cut down exposure time and thus allowed for some movement in the image without blurring as subjects were not required to sit for long periods to produce sharp results.