Werner von Siemens Dial telegraph Morse's telegraph Telephone Carbon-arc lamp Electrical tramway Dinamo Vacuum cleaner Tantalum lamp The PROTOS cars Radio-receiver Circuit breakers Television High-purity silicon Ultrasonic scanner ISDN MultiMediaCard Fingertip sensor  Screensaver

The Gallery of Technological wonders Carbon-arc lamp In 1878 Friedrich v. Hefner-Alteneck of the Siemens & Halske developed the first carbon-arc lamp with automatic regulating system. Due to their high luminous intensity, carbon-arc lamps were still used after the turn of the century for illuminating streets and squares.   Siemens S.p.A. 1999 - Milano Communication and Marketing Reproduction and use of the images and texts are prohibited.