There is not so much information available about professional cinema projectors. One of the reasons is that the general public goes to a cinema and doesn’t often see these projectors, as opposed to the projectors for home use. Another reason is that professional movies were aggressively copy-protected by the movie industry, so only a selected few were capable of showing cinema movies.

The book “Deutsche Laufbildprojektoren” gives information which is hard to find elsewhere. I remember trying to get a copy of the original book and having to search for over a year to get hold of it (and paying a stiff price too). The veteran collectors who have it won’t part from it easily.

The technology of these projectors is advanced and rugged. The German Ernemann Imperator projector for example conquered the market early. In 1913,  22 out of 28 cinemas in Paris had these projectors. As recent as 1979 some of these projectors were still in operation.

This kind of information and much more needs to be kept accessible as a document of history. Normally it could be made public only 70 years after death of the last author. Therefor the copyright-holders agreeing to it’s re-publication in electronic form August 14 is something many appreciate.

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