The Heidoscop was a great success, exceeding all expectations. In 1923, the company introduced a Heidoscop for 117 format (B1) roll-film. It was from this product, the "'Roll-film Heidoscop"', that the name Rollei was derived, which later became the name of company. Hyperinflation in Germany Between 1914 and 1923, the period of hyperinflation in Germany, Paul Franke lived up to his reputation as a savvy financier: he invested the income from exports (in foreign currency) so astutely that the company came through this difficult period unscathed – a rather unlikely outcome if Heidecke, alone, had made these decisions. During this period the company acquired new premises. The City Council in Braunschweig did not really want a noisy factory operating within a residential area and pressured the company to move its factory elsewhere. Accordingly, on 10 January 1923 the company purchased a plot of land on Salzdahlumer Straße, which at that time lay just beyond the city limits. Hyperinflation had devalued the currency so much that the land purchase cost practically nothing. Once the new factory had been built, much was expected of the new camera. However, Paul Franke proposed a temporary suspension of further development work because of the catastrophic economic situation. Heidecke concurred, believing that better times lay ahead. Rolleiflex The first prototype of the new camera, named the Rolleiflex, was finally completed in 1927; it was built for absolute reliability and featured a rigid, injection-moulded housing made of aluminium. Heidecke wanted to avoid conventional leather bellows for focusing the lens because of an earlier, bad experience: around 1916, he conducted an experiment with a Kodak camera; he left it in a cellar, and when he later retrieved it, he found that rats had eaten the bellows. This convinced him that a camera designed for photojournalism and operation in the tropics had to work perfectly, which excluded components that might rot. He ruled out a cloth shutter curtain for the same reason, choosing instead a Compur mechanical shutter. Focusing in the "Rolleiflex" was achieved by moving the carriage that held both the viewfinder and the imaging lens, i.e. the camera had so-called "metallic bellows"; that is, the plate enclosed the sides of the case. It was crucial that the plate remained parallel as it moved during focusing; to achieve this, Heidecke developed an ingenious design which proved to be highly successful. Behind the imaging lens and surrounding the opening