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Illumination for the Emperor's intended visit to Postojnska jama, Slovenia, in 1856 (and used when he came in 1857?)
Trevor R. Shaw - (32/2,2003)
Three documents in the archives of Postojnska jama show that the arrangements for the planned visit of Emperor Franz Joseph to the cave in 1856 included the use of coloured lights and other special illumination as well as glass transparencies for labelling halls and speleothems. Although this visit was cancelled at the last minute, the Emperor did come to the cave 15 weeks later and it is shown that almost certainly the illumination was used then.
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