Images Dated 7th November 2005

Marconi radio valve

Marconi radio valve. This is a Marconi transmitter valve of the type M.T.6. Marconi patented his radio equipment in 1896, founding a company in 1897 to build the new equipment. The thermionic valve, or vacuum tube, first developed in 1906, is a device used to amplify or modify a voltage, in this case to transmit a radio signal. Photograph courtesy of the Radio Corporation of America, New York, USA, formed in 1920 from the American Marconi Company. Photographed for The March of Commerce (1927), volume 4 of The Pageant of America: A Pictorial History of the United States, a 15-volume series that commemorated 150 years since the founding of the USA in 1776

© HUMANITIES & SOCIAL SCIENCES LIBRARY/NEW YORK PUBLIC LIBRARY/SCIENCE PHOTO LIBRARY

Red Japanese Maple (Acer palmatum) leaves, Washington State, USA

Acer palmatum, commonly known as palmate maple, Japanese maple or smooth Japanese-maple is a species of woody plant native to Japan, China, Korea, eastern Mongolia, and southeast Russia. Many different cultivars of this maple have been selected and they are grown worldwide for their large variety of attractive forms, leaf shapes, and spectacular colors

© Darrell Gulin / Danita Delimont

County Court House Or Independence Hall, Philadelphia Pennsylvania In 1870S. From American Pictures Drawn With Pen And Pencil By Rev Samuel Manning Circa 1880

© Ken Welsh / Design Pics

American, Antique, Architectural, Architecture, Black And White, Building, Buildings, County Court House, Debated, Declaration Of Independence, Drafted, Drawings, Historical, History, Illustration, Independence Hall, Old, Pennsylvania, Philadelphia, Signed, United States Of America, Usa, Vertical