In 1896 the 163 optical businesses were registered in Rathenow, many developed out of home work-places of Busch employees. Then a good part of its money should be spent for social and educational purposes. They made provisions for the case when the company should be closed one day. In 1877 Emil Busch and Eduard Duncker founded a support foundation for Busch workers. The company then had larger buildings with better working rooms, including bathing rooms and a first aid station, but still a lot of home-workers. In 1872 the Optische Anstalt Rathenow became the stock market company Emil Busch AG. In 1865 it started making its newly invented wide angle lens Pantoscop and won a prize for its photographic products. In 1856 the company got its first steam engine. Since Eduard Duncker and his wife had no children he sent his nephew from Berlin Emil Busch (1820-1888) back to Berlin for an apprenticeship in optics. In 1843 it made 250,000 lens elements and 40,000 glasses frames which were sold through 300 shops between New York and Moscow. Its products were sold through trade fairs. The company then had skilled workers instead of children and war invalids, but many of them had to work at home because the company's rooms were not sufficient. In the 1840s it started to make modern spectacles with steel frames. When his son Eduard (1797-1878) took over the company in 1819 it had begun to make auricular tubes. Duncker gave glasses for free to poor people. The first products were spectacles which were sold through specialised shops instead of by house-to-house salesmen. With low wages and piece-work he could produce cheaply. He disassembled it and made his own grinding machine from the parts. From a bankrupt optical plant in Neuruppin he bought a big multiple-lens grinding machine. He employed orphaned children and war invalids in his Optische Industrie-Anstalt. In 1801 he got permission from the Prussian King to extend his business to industrial dimensions. In 1792 the pastor Johann Heinrich August Duncker (1767-1843) of Rathenow began to make optical instruments and sold them in Germany. The F:4.5 Omnar, the remarkable Bis-Telar F:7 telephoto lens, the fast Glaukar F:3.1 Anastigmat and the Preis-Kamera (9x12 or 10x15). was a camera and lens maker in Rathenow, Germany.
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