From the beginning on of the project “Carte du Ciel”, the idea had been to reproduce the glass plates in a sustainable manner by way of engraving. Thus, from every glass plate, a copy with an enlargement of a factor two had to be obtained, including also its mirror image on glass. From this mirror image, a copper engraving was finally obtained with a technique of corrosion versus insulation. Those observatories who didn’t have the resources to make this expensive reproduction, printed their charts directly on photographic paper. The Royal Observatory at Uccle, however, followed the example of that of Paris and produced the paper prints using the copper engravings.
More information on the astrographic equatorial telescope which has contributed since 1908 to the mapping of the Uccle zone for the "Carte du Ciel" project and on the project see http://www.astro.oma.be/en/scientific-research/astronomy-astrophysics/carte-du-ciel/
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