The SciencesAn Automatic Lamp Lighting and Extinguishing DeviceSeptember 24, 1904 — Alfred Gradenwitz
TechnologyThe New Nemethy Flying-Machine and the Principle of Its ConstructionJuly 9, 1904 — Alfred Gradenwitz
TechnologyThe Autoplastic Photographic Process of Producing Sculptural PortraitsJune 25, 1904 — Alfred Gradenwitz