Answer the question at the end by quoting:

Melungeon ( m@-LUN-j@n) is a term traditionally applied to one of numerous "tri-racial isolate" groups of the Southeastern United States. Historically, Melungeons were associated with the Cumberland Gap area of central Appalachia, which includes portions of East Tennessee, Southwest Virginia, and eastern Kentucky. Tri-racial describes populations thought to be of mixed European, African and Native American ancestry. Although there is no consensus on how many such groups exist, estimates range as high as 200.
The ancestry and identity of Melungeons has been a highly controversial subject. Secondary sources disagree as to their ethnic, linguistic, cultural, and geographic origins and identity, as they are of mixed racial ancestry. They might accurately be described as a loose collection of families of diverse origins who migrated, settled near each other, and intermarried, mostly in Hancock and Hawkins counties in Tennessee, nearby areas of Kentucky, and in Lee County, Virginia. Their ancestors can usually be traced back to colonial Virginia and the Carolinas. They were largely endogamous, marrying primarily within their community until about 1900.  Melungeons have been defined as having multiracial ancestry. They did not exhibit characteristics that could be classified as those of a single racial phenotype. Most modern-day descendants of Appalachian families traditionally regarded as Melungeon are generally European American in appearance, often (though not always) with dark hair and eyes, and a swarthy or olive complexion. Descriptions of Melungeons have varied widely over time; in the 19th and early 20th century, they were sometimes identified as "Portuguese," "Native American," or "light-skinned African American". During the ninetee|nth century, free people of color sometimes identified as Portuguese or Native American in order to avoid being classified as black in the segregated slave societies. Other Melungeon individuals and families are accepted and identify as white, particularly since the mid-20th century. They have tended to "marry white" since before the twentieth century.  Scholars and commentators do not agree on who should be included under the term Melungeon. Contemporary authors identify differing lists of surnames to be included as families associated with Melungeons. The English surname Gibson and Irish surname Collins appear frequently; genealogist Pat Elder calls them "core" surnames. Vardy Collins and Shep Gibson had settled in Hancock County, and they and other Melungeons are documented by land deeds, slave sales and marriage licenses. Other researchers include the surnames Powell, LeBon, Bolling, Bunch, Goins, Goodman, Heard, Minor, Mise, those Mullins who are not descended from Booker Mullins (1768-1864) , and several others. Descendants of Booker Mullins are excluded because 1) the Mullins Y-DNA Project in Virginia confirmed that Booker was the son of Sherwood/Sherrod Adkins and is not a "true Mullins" and 2) DNA-tests of Booker's descendants do not have an Melungeon markers in their DNA. (Family lines have to be researched individually, as not all families with these surnames are Melungeon.) As with many other surname groups, not all families with each surname have the same racial background and ancestry.  The original meaning of the word "Melungeon" is obscure (see Etymology below). From about the mid-19th to the late 20th centuries, it referred exclusively to one tri-racial isolate group, the descendants of the multiracial Collins, Gibson, and several other related families at Newman's Ridge, Vardy Valley, and other settlements in and around Hancock and Hawkins counties, Tennessee.

What do the others say

Secondary sources disagree as to their ethnic, linguistic, cultural, and geographic origins and identity, as they are of mixed racial ancestry.

IN: James Watt  (30 January 1736 (19 January 1736 OS) - 25 August 1819) was a Scottish inventor, mechanical engineer, and chemist who improved on Thomas Newcomen's 1712 Newcomen steam engine with his Watt steam engine in 1781, which was fundamental to the changes brought by the Industrial Revolution in both his native Great Britain and the rest of the world. While working as an instrument maker at the University of Glasgow, Watt became interested in the technology of steam engines. He realised that contemporary engine designs wasted a great deal of energy by repeatedly cooling and reheating the cylinder. Watt introduced a design enhancement, the separate condenser, which avoided this waste of energy and radically improved the power, efficiency, and cost-effectiveness of steam engines.

From an early age Watt was very interested in chemistry. In late 1786, while in Paris, he witnessed an experiment by Berthollet in which he reacted hydrochloric acid with manganese dioxide to produce chlorine. He had already found that an aqueous solution of chlorine could bleach textiles, and had published his findings, which aroused great interest among many potential rivals. When Watt returned to Britain, he began experiments along these lines with hopes of finding a commercially viable process. He discovered that a mixture of salt, manganese dioxide and sulphuric acid could produce chlorine, which Watt believed might be a cheaper method. He passed the chlorine into a weak solution of alkali, and obtained a turbid solution that appeared to have good bleaching properties. He soon communicated these results to James McGrigor, his father-in-law, who was a bleacher in Glasgow. Otherwise he tried to keep his method a secret.  With McGrigor and his wife Annie, he started to scale up the process, and in March 1788, McGrigor was able to bleach 1500 yards of cloth to his satisfaction. About this time Berthollet discovered the salt and sulphuric acid process, and published it so it became public knowledge. Many others began to experiment with improving the process, which still had many shortcomings, not the least of which was the problem of transporting the liquid product. Watt's rivals soon overtook him in developing the process, and he dropped out of the race. It was not until 1799, when Charles Tennant patented a process for producing solid bleaching powder (calcium hypochlorite) that it became a commercial success.  By 1794 Watt had been chosen by Thomas Beddoes to manufacture apparatus to produce, clean and store gases for use in the new Pneumatic Institution at Hotwells in Bristol. Watt continued to experiment with various gases for several years, but by 1797 the medical uses for the "factitious airs" had come to a dead end.

what did people think of his experiments?

OUT:
Otherwise he tried to keep his method a secret.