This academic document describes various methods of measuring a principal's leadership behavior. The authors developed a new survey instrument that can be used to analyze the leadership behavior/style of a principal.

Vasarosnamenyi Baro Eotvos Lorand, better known as Roland Eotvos or Lorand Eotvos throughout much of the world, was a Hungarian physicist who is most recognized for his extensive experimental work involving gravity, but who also made...

Using primary documents, oral histories, and other historical resources, discover how the arts of Africa, Europe, and pre-Civil War America influenced the culture of enslaved African Americans.

This site explains how a digital pH meter uses an electrode to measure the pH of a solution Find out how to use this instrument in this informative site.

A self-educated man with a brilliant mind, Michael Faraday was born in a hardscrabble neighborhood in London. Through the combination of insatiable curiosity and a powerful will to succeed, he transcended his austere beginnings to...

The integrated circuit fueled the rise of microelectronics in the latter half of the twentieth century and paved the way for the Information Age. An American engineer, Jack Kilby, invented the integrated circuit in 1958, shortly after he...

Telephones began to appear in North Carolina beginning in 1879, three years after Alexander Graham Bell's new invention had first been introduced at the Centennial Exposition in Philadelphia. On 10 March of that year, a telephone was...

This entry from Encyclopedia Britannica features Sonny Boy Williamson, an American blues vocalist and the first influential harmonica virtuoso, a self-taught player who developed several technical innovations on his instrument.

Looks at the many devices used to measure angles in academic settings and in real-world settings.

Pictures and descriptions of the Guarneri twin violins.