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Observing the 1874 Transit of Venus over the face of the sun was very popular with scientists. Many expeditions to the best viewing points in the world were organized; at least 62 parties would visit 80 locations. In preparation, much effort was made to find the best techniques to get objective and permanent records of the event. Frenchman inventor Janssen came up with the idea for a revolver photographic. This huge camera system used a Maltese cross-type mechanism, very similar to the system that would later be of great importance in the development of movie cameras. The revolver could take several dozens of exposures at regulated intervals on a daguerreotype disc. Janssen later suggested that his apparatus might become suitable for the study of animal movements once photographic materials would allow the very brief exposures necessary. Written by Peter-Patrick76 (peter-patrick@mail.com)

A group of people are standing in a straight line along the platform of a railway station, waiting for a train, which is seen coming at some distance. When the train stops at the platform, the line dissolves. The doors of the railway-cars open, and people on the platform help passengers to get off. Written by Maths Jesperson {maths.jesperson1@comhem.se}

A man opens the big gates to the Lumière factory. Through the gateway and a smaller doorway beside it, workers are streaming out, turning either left or right. Most of them are women in long dresses and big hats, but some are men. Suddenly a man with a long apron rushes out through the crowd, followed by a big dog. At last some men on bikes leave the gateway. When all workers have left the factory, the doorkeeper starts closing the gates again. Written by Maths Jesperson {maths.jesperson1@comhem.se}