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NAIC/Arecibo Radiotelescope
Society: IEEE Main Category: Electrical Sub Category: Signals Era: 1960-1969 DateCreated: 1963 Arecibo Observatory Arecibo State: PR Zip: 00612 Country: USA Website: Creator: Gordon, William , Doundoulakis, Helias

The Arecibo Observatory has the largest radio telescope ever constructed. Maintaining the greatest electromagnetic wave gathering capacity of any telescope, it has been an essential tool in modern astronomy, ionosphere and planetary studies. Several feats of mechanical engineering went into the construction of this observatory, most notable of which is a drive system which allows all active parts of the antenna to be kept focused with millimeter precision regardless of environmental factors—such as thermal expansion.

Image Credit: Image Caption: NAIC/Arecibo Radiotelescope Era_date_from: 1963
Society: ASME Main Category: Mechanical Sub Category: Research and Development Era: 1910-1919 DateCreated: 1918 Pasadena State: CA Zip: Country: USA Website:,-100-inch-hooker-tele Creator: Pease, Francis G. , Hale, George Ellery
The increased light-grasp of this telescope made possible many notable advances in structural cosmology between 1924 and 1930, which have revised our ideas about the universe. One of these advances was that spiral nebulae are galactic units like our own; another was the idea of an expanding universe. George Ellery Hale began planning this project in 1906; Francis G. Pease was the chief designer and mechanical engineer. The telescope's mirror support and the use of mercury flotation to reduce the friction are among its outstanding mechanical engineering features.
Image Credit: Courtesy Flickr/Bruce Irving (CC BY 2.0) Image Caption: Mount Wilson Observatory, 100-inch Hooker Telescope Era_date_from: 1918
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