paris exhibition 1878 the trocadero France
For the 1878 exhibition the engineer de Dion designed a kind of trussed portal frame assembled from prefabricated elements. In between each of the frames spanned trussed iron purlins. De Dion realised that the rigid skeleton created by the purlins and the frames would be subject to considerable thermal movement and to allow for this he introduced movement joints every 60m. These consisted of bolts in oval holes, a problem and solution still used in long span steel structures today. Then in 1878 Malling-Hansen attended the World Exhibition in Paris, and for this event he had worked out four models of the writing ball, two of them shown in the information folder of the Danish Section. The writing ball had gone through several important improvements, and now it was equipped with a colour ribbon and did not longer use an electromagnetic battery, and thus the weight and the size were reduced drasticly. Also in Paris he received the First Price medal in gold. At the same exhibition his competitor, the American typewriter inventor Densmore, also exhibited his Sholes&Glidden typewriter produced by the Remington Factory. His typewriter was at this stage very big and heavy, and received the Silver medal in Paris, a fact that Malling-Hansen refers to in some of his letters from this period. It's obvious that he was extremely proud that the experts valued his writing ball higher than the American Remington machine. But as we know, he still lost the commercial competition, as the improved Remington machine only a few years later was sold in a number of probably more than 2500 specimens, while the writing ball produced never exceeded more than a couple of hundreds. According to private letters to his brother, Johan Frederik Hansen, Malling-Hansen exhibited 4 different models in Paris. From the official papers we know that the new tall model with colour ribbon and the small model for paperstrips on a wooden foot were developed for this exhibition. The two other models may have be
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