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The first swimming pool cleaner was invented in 1912 by Pittsburgh, Pennsylvania citizen John M. Davison. On November 26, 1912, he submitted a patent application to the United States Patent and Trademark Office entitled "Cleaning Apparatus For Swimming Pools And The Like", which was issued on March 25, 1913.
An Olympic-size swimming pool (first used at the 1924 Olympics) is a pool that meets FINA's additional standards for the Olympic Games and for world championship events. It must be 50 by 25 m (164 by 82 ft) wide, divided into eight lanes of 2.5 m (8.2 ft) each, plus two areas of 2.5 m (8.2 ft) at each side of the pool.
When any of these pool chemicals are used, it is very important to keep the pH of the pool in the range 7.2 to 7.8 – according to the Langelier Saturation Index, or 7.8 to 8.2 – according to the Hamilton Index; higher pH drastically reduces the sanitizing power of the chlorine due to reduced oxidation-reduction potential (ORP), while lower ...
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Completed in 1931, North Park is sited 15 miles (24 km) northeast of downtown Pittsburgh in Hampton, McCandless, and Pine Townships. The park features the largest man-made body of water in the county, over 75 acres (300,000 m 2), bordered by four miles of woodlands. Its swimming pool was one of the largest in the United States when it opened on ...
French Creek State Park. CCC barracks near the park office. French Creek State Park is a 7,977-acre (3,228 ha) Pennsylvania state park in North Coventry and Warwick Townships in Chester County and Robeson and Union Townships in Berks County, Pennsylvania. [3] It straddles northern Chester County and southern Berks County along French Creek.
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