A discussion of various principles related to voltage. The operation of battery testers and voltmeters are explained. The importance of the internal resistance of a power source is discussed.

This site from the B&R Samizdat Express provides text of Warren's works: The Adulateur, The Defeat, The Group, The Blockheads, The Motley Assembly, and more.

Learners examine the set of real numbers. The resource includes detailed explanations about rational and irrational numbers. It provides example problems.

A stop codon is a nucleotide triplet in messenger RNA that signals the end of a protein during the translation process. Read about how this works, the different types of stop codons, and how a mutation can sometimes occur.

Information on the W.P.A.'s creation, accomplishments, critics, and termination with a special focus on the Historical Records Survey.

Information on the W.P.A.'s creation, accomplishments, critics, and termination with a special focus on the Historical Records Survey.

"South China comprises the drainage basins of the middle and lower Yangtze River, the basin of the His Chiang (West River) in Kwangtung and Kwangsi; and the mountainous coastal provinces of Fukien and Chekiang. The division between the...

A plan of Rome in 1921 showing Pincian Hill (1), Hadrian's Tomb (2), Saint Peter's (3), Vatican (4), Pantheon (5), Quirinal (Royal Palace) (6), Baths of Diocletian (7), Railway Terminal (8), Column of Trajan (9), Capitol (10), Forum...

A map from 1890 of the West Indies region showing the highland structure of the island chains and groups, and illustrating the Caribbean Sea as an enclosed basin. This map also shows the Bahamas as a separate structure not related to the...

A map from the 1920 Automobile Club of Rochester showing automobile routes in the Great Lakes Region, around western Lake Ontario, and the Canadian portion of Lake St. Clair and southern Lake Huron. The map shows route numbers, mileages...

A map from the 1920 Automobile Club of Rochester showing automobile routes of New York around Lake Champlain and the southern portions of Canada from Kingston on Lake Ontario to Ottawa and Montreal to the north. The map shows route...

A map from the 1920 Automobile Club of Rochester showing automobile routes of New York and vicinities to the north. The map shows route numbers, mileages and terminals only. The inset map shows the automobile routes between New York City...

A map from 1911 of the Panama Canal, showing the line of the canal with the miles from Colon given (49 miles from Colon to Panama City), the existing and proposed location of the Panama Railroad, dams, feeding rivers and mountains, towns...

This is a plan of the Durham Cathedral, England. It is an example of English Gothic architecture. Building began in 1093 and was finished in approximately 40 years. "The square eastern termination, the less ambitious height, and the...

A map from 1898 of the United States showing physical features of mountain systems and highlands, basins, plains, prairies, limits of the glacial terminal moraines, lakes, rivers, and coastal features. The highlands above 2000 feet are...

A map from 1902 of the United States showing physical features of mountain systems and highlands, basins, plains, prairies, limits of the glacial terminal moraines, lakes, rivers, and coastal features. The highlands above 2000 feet are...

A map from 1911 of Bell Canyon in the Wasatch Mountains of Utah. The map shows a series of morainic ridges near the mouth of the canyon and the typical pattern of the terminal moraine (T), lateral moraines (L), and recessional moraines...

A map from 1911 showing the four drift sheets of the last glacial period that covered this portion of Wisconsin. The terminal moraines of the greater ice sheets are shown, indicating the Driftless Area of Wisconsin.

Built up after the California Gold Rush, this historic district also includes the NHL locations of the Pony Express Terminal and the Big Four House.

Main Terminal of Washington Dulles International Airport at dusk in Virginia, USA.

The Ferry Building is a terminal for ferries on the San Francisco Bay and an upscale shopping center located on The Embarcadero in San Francisco, California.

A cart; also a two-wheeled carriage enclosed, and with an arched or sloping cover overhead. The carpentum was used to convey the Roman matrons in the public festal processions; and, as this was a high distinction, the privilege of riding...

The Gauntlet is a piece of protective armor for the hand, dating back to the 12th century. The first gauntlets were leather covered gloves with an unarticulated metal back. They evolved from the chain mail bag, which , in the 12th...

General Webb, born in New York city, February 15th, 1835, was graduated from the United States Military Academy in 1855, and assigned to the artillery. He served in Florida, Minnesota, and for three years as assistant professor at West...