Blaw-Knox tower
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The Blaw-Knox company was a manufacturer of steel structures and construction equipment based in Pittsburgh, Pennsylvania. The company is today best known for its radio towers, most of which were constructed during the 1930s in the United States. Although Blaw-Knox built many kinds of towers, the term Blaw-Knox tower (or radiator) usually refers to the company's unusual "diamond cantilever" design, which is held upright by guy wires attached only at the vertical center of the mast, where its cross-section is widest.
Many Blaw-Knox towers, of both conventional (uniform cross-section) and diamond design, remain in use in the United States. Few of the diamond towers were built, and several remain; all transmit AM radio signals:
- WSM, Nashville, Tennessee: 808 ft (246 m); originally 874 ft (267 m); tower located in Brentwood, Tennessee.
- WLW, Cincinnati, Ohio: 747 ft (227 m); originally 831 ft (253 m); tower located in Mason, Ohio.
- WBT, Charlotte, North Carolina: three towers, 428 ft (130 m) each (one original, two reproductions from the original plans after the originals were destroyed in a hurricane)
- WFEA, Manchester, New Hampshire: 400 ft (121 m)
- WBNS, Columbus, Ohio: 380 ft (116 m)
Several additional such towers are in use at stations in California but are less well-known.
The following Blaw-Knox diamond-cantilever towers remain standing in Europe:
- Lisnargarvey Mast (constructed: 1936) at Lisnargarvey, Northern Ireland
- Lakihegy Tower (constructed: 1933, height: 314 metres) at Budapest-Lakihegy, Hungary
- Vakarel Transmitter (constructed: 1937, height: 352.9 metres, tallest Blaw-Knox Tower in the world) at Vakarel, Bulgaria
- Stara Zagora Transmitter at Stara Zagora, Bulgaria
- Riga LVRTC Transmitter at Riga, Latvia
[edit] Blaw-Knox Towers in Culture
The design of Kamzik TV Tower may have been inspired by Blaw-Knox Towers. In comics and trickfilms guyed radio masts are often drawn as Blaw-Knox Towers.[citation needed]
