Edison made over ten years was repaid handsomely, and the storage battery eventually became Edison's most profitable product. Further, Edison's work paved the way for the modern alkaline battery." 1900 – The Brownie camera is invented; this was the beginning of the Eastman Kodak company. The Brownie popularized low-cost photography and introduced the concept of the snapshot. The first Brownie was introduced in February 1900, 1900 – The first zeppelin flight occurs over Lake Constance near Friedrichshafen, Germany on July 2, 1900. 1901 – First electric typewriter is invented by George Canfield Blickensderfer of Erie, Pennsylvania. It was part of a line of Blickensderfer typewriters, known for its portability. 1901 – Wilhelm Kress of Saint Petersburg, Russia creates his Kress Drachenflieger in Austria-Hungary. Power was provided by a Daimler petrol engine driving two large auger-style two-bladed propellers, the first attempt to use an internal combustion engine to power a heavier-than-air aircraft. 1901 – The first radio receiver (successfully received a radio transmission). This receiver was developed by Guglielmo Marconi. Marconi established a wireless transmitting station at Marconi House, Rosslare Strand, County Wexford, Ireland in 1901 to act as a link between Poldhu in Cornwall and Clifden in County Galway. He soon made the announcement that on 12 December 1901, using a kite-supported antenna for reception, the message was received at Signal Hill in St John's, Newfoundland (now part of Canada), signals transmitted by the company's new high-power station at Poldhu, Cornwall. The distance between the two points was about . Heralded as a great scientific advance, there was—and continues to be—some skepticism about this claim, partly because the signals had been heard faintly and sporadically. There was no independent confirmation of the reported reception, and the transmissions, consisting of the Morse code letter S sent repeatedly, were difficult to distinguish from atmospheric noise. (A detailed technical review of Marconi's early transatlantic work appears in John S. Belrose's work of 1995.) The Poldhu transmitter was a two-stage circuit. The first stage operated at a lower voltage and provided the energy for the second stage to spark at a higher voltage. 1902 – Willis Carrier of Angola, New York, invented the first indoor air conditioning. "He designed his spray driven air conditioning system which controlled both temperature and humidity using a nozzle originally designed to spray insecticide. He built his "Apparatus for Treating Air" (U.S. Pat. #808897) which was patented in 1906