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Despite its widespread use in industry, carbon tetrachloride has been banned for home use. In the past, carbon tetrachloride was a common ingredient in cleaning compounds that were used throughout the home, but it was found to be dangerous: when heated, it changes into a poisonous gas that can cause severe illness and even death if it is inhaled. Because of this dangerous characteristic, the United States revoked permission for the home use of carbon tetrachloride in 1970. Trial techniques philippines pdf online. The United States has taken similar action with various other chemical compounds. The next artist in this survey of American artist is James Whistler; he is included in this survey of American artist because he was born in the United States, although the majority of his artwork was completed in Europe.

Whistler was born in Massachusetts in 1834, but nine years later his father moved the family to St. Petersburg, Russia, to work on the construction of a railroad. The family returned to the United States in 1849. Two years later Whistler entered the U.S. Military academy at West Point, but he was unable to graduate. At the age of twenty-one Whistler went to Europe to study art despite familial objections, and he remained in Europe until his death. In reality, though, stars are always moving, but because of the tremendous distances between stars themselves and from stars to Earth, the changes are barely perceptible here.

An example of a rather fast-moving star demonstrates why this misconception prevails; it takes approximately 200 years for a relatively rapid star like Bernard's star to move a distance in the skies equal to the diameter of the earth's moon. When the apparently negligible movement of the stars is contrasted with the movement of the planets, the stars are seemingly unmoving. Whereas literature in the first half of the eighteenth century in America had been largely religious and moral in tone, by the latter half of the century the revolutionary fervor that was coming to life in the colonies began to be reflected in the literature of the time, which in turn served to further influence the population. Although not all writers of this period supported the Revolution, the two best-known and most influential writers, Ben Franklin and Thomas Paine, were both strongly supportive of that cause. Ben Franklin first attained popular success through his writings in his brother's newspaper, the New England Current.

In these articles he used a simple style of language and common sense argumentation to defend the point of view of the farmer and the Leather Apron man. He continued with the same common sense practicality and appeal to the common man with his work on Poor Richard's Almanac from 1733 until 1758. Firmly established in his popular acceptance by the people, Franklin wrote a variety of extremely effective articles and pamphlets about the colonist's revolutionary cause against England.