By late 1878, I reported success to the Newcastle Chemical Society and in February 1879 demonstrated a working lamp in a lecture in Newcastle. My lamps contained the major elements seen in Edison's lamps that October: an enclosed glass bulb from which all air had been removed, platinum lead wires, and a light-emitting element made from carbon.   

obrien, nikolas. "lighting Revolution:joseph swan." americanhistory. americanhistory.com, 3/25/2011. Web. 25 Mar 2011. <http://americanhistory.si.edu/lighting/bios/swan.htm>.