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Keuffel and Esser 7" slide rule (5" scale, 1954) [1] A slide rule scale is a line with graduated markings inscribed along the length of a slide rule used for mathematical calculations.
Initially, paper was ruled by hand, sometimes using templates. [1] Scribes could rule their paper using a "hard point," a sharp implement which left embossed lines on the paper without any ink or color, [2] or could use "metal point," an implement which left colored marks on the paper, much like a graphite pencil, though various other metals were used.
Phalaborwa is home to Palabora Mining.The massive open pit mine, nearly 2,000 meters across, is Africa's widest manmade hole. Founded in 1951, Foskor's Mining Division in Phalaborwa mines phosphate rock (foskorite and pyroxenite), from which Foskor's Acid Division in Richards Bay produces phosphoric acid and phosphate-based granular fertilisers for local and international markets.
Most scholars date the tablet to the 25th to 24th century BC. Hills are shown by overlapping semicircles, rivers by lines, and cities by circles. The map also is marked to show the cardinal directions. [13] An engraved map from the Kassite period (14th–12th centuries BC) of Babylonian history shows walls and buildings in the holy city of ...
Sunset Crater Volcano National Monument is a U.S. national monument created to protect Sunset Crater, a cinder cone within the San Francisco Volcanic Field. [14] The monument is managed by the National Park Service in conjunction with nearby Wupatki National Monument.
These glaciers include Blue, Hoh, Humes, Jeffers, Hubert, Black Glacier, and White, the longest of which is the Hoh Glacier at 3.06 miles (4.93 km). The largest is Blue with a volume of 0.14 cubic miles (0.57 km 3 ) and area of 2.05 square miles (5.31 km 2 ). [ 6 ]
The main idol in the temple is of Tirthankara Rishabha, carved in black stone in padmasana posture, about 3.5 feet (1.1 m) tall. Monsoon Palace and Sajjangarh Biological Park The Monsoon Palace, also known as Sajjan Garh Palace, was built as an astronomical center to keep track of the movement of monsoon clouds in the area and also served as ...
Detailed map of Shetland, labelling many placenames. The name Shetland may derive from the Old Norse words hjalt ('hilt'), and land ('land'), the popular and traditional claim. Another possibility is that the first syllable is derived from the name of an ancient Celtic tribe. [8] [9] Andrew Jennings has suggested a link with the Caledones.