Search results
Results from the WOW.Com Content Network
It was first discovered and isolated by Scottish physician Daniel Rutherford in 1772 and independently by Carl Wilhelm Scheele and Henry Cavendish at about the same time. The name nitrogène was suggested by French chemist Jean-Antoine-Claude Chaptal in 1790 when it was found that nitrogen was present in nitric acid and nitrates.
Rutherford discovered nitrogen by the isolation of the particle in 1772. [ 12 ] [ 13 ] When Joseph Black was studying the properties of carbon dioxide , he found that a candle would not burn in it. Black turned this problem over to his student at the time, Rutherford.
The Clearfield Coalfield is a bituminous coal mining area in Clearfield County, Pennsylvania, [1] United States. The coal seams are found in most parts of Clearfield County, with the notable exception of the northern part of the county.
The former name appears in Thomas Francis Gordon's A Gazetteer of the State of Pennsylvania, which was published in 1833. The latter name appears in a 1982 county highway map made by the Pennsylvania Department of Transportation. [14] [15] The creek is named after a Delaware word for "Eel Creek". [16]
Both Delaware and Susquehannock power had been broken by disease and wars between Native American tribes before the British took over the Dutch and Swedish colonies and settled Pennsylvania. The first discovery of anthracite coal in the region occurred in 1762, and the first mine was established 13 years later, in 1775 near present-day Pittston ...
Following the work by Claude Louis Berthollet published in 1784, chemists knew ammonia to be a nitrogen compound. [23] Early attempts to synthesize ammonia were performed in 1795 by Georg Friedrich Hildebrandt. Several others were made during the nineteenth century. [24] In the 1870s, ammonia was an unwanted byproduct of making manufactured gas.
A man found frozen in a Pennsylvania cave in 1977 has finally been identified, closing the book on a nearly 50-year-long mystery. The Berks County Coroner’s Office identified the remains of the ...
In 1792, the Lehigh Coal Mine Company (LCMC) was founded. [3] It was incorporated the following year, in 1793, and the company also acquired 10,000 acres (4,000 ha) [3] in and around Panther Creek Valley and Pisgah Mountain, [3] and the aim of hauling anthracite coal from the large deposits on Pisgah Mountain near what is now Summit Hill, Pennsylvania, to Philadelphia via mule train to arks ...