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Third rail print that page


insulated brackets, typically at intervals of 10 feet (3.0 metres) or so. The trains have metal contact blocks called "shoes" which make contact with the conductor rail. The traction current is returned to the generating station through the running rails. The conductor rail is usually made

Curling print that page


Approximately late medieval Scotland Registered players 1,200,000 Characteristics Contact No Team members 4 per team (2 in Mixed Doubles ) Mixed gender See mixed curling Categorization Precision and accuracy Equipment Curling brooms, stones (rocks), curling shoes

Tackle (football move) print that page


ground towards goal or to stop them from carrying out what they intend. The word is used in some contact variations of football to describe the act of physically holding or wrestling a player to the ground. In others, it simply describes one or more methods of contesting for possession of

Sampling (statistics) print that page

In statistics and survey methodology , sampling is concerned with the selection of a subset of individuals from within a population to estimate characteristics of the whole population. Researchers rarely survey the entire population because the cost of a census is too high. The three main | 2011/10/1 1:00:25

Bartolomeo Cristofori print that pageTimeline of Bartolomeo Cristofori


The available source materials on Cristofori's life include his birth and death records, two wills, the bills he submitted to his employers, and a single interview done by Scipione Maffei . From the latter, we have both Maffei's notes and the published journal article. Cristofori was born

Nine-ball print that page


In recent decades, nine-ball has become the dominant tournament game in professional pool, in the World Pool-Billiard Association , Women's Professional Billiard Association and United States Professional Poolplayers Association . Matches proceed quickly, suitable for the time constraints

Tire print that page


performance by providing a flexible cushion that absorbs shock while keeping the wheel in close contact with the ground. The word itself may be derived from the word "tie," which refers to the outer steel ring part of a wooden cart wheel that ties the wood segments together (see Etymology

Pensacola Christian College print that page


Dr. Arlin and Beka Horton moved to Pensacola, Florida in 1952 to found a Christian grade school. That school, Pensacola Christian School, opened in 1954. In 1974, the Hortons opened Pensacola Christian College to further their vision of "Education from a Christian Perspective." Pensacola

Lake Burley Griffin print that page


Griffin designed the lake with many geometric motifs, so that the axes of his design lined up with natural geographical landmarks in the area. However, government authorities changed his original plans and no substantial work was completed before he left Australia in 1920. His scheme remained

Eyeglass prescription print that page


An eyeglass prescription is an order written by an eyewear prescriber, such as an optometrist or ophthalmologist , that specifies the value of all parameters the prescriber has deemed necessary to construct and/or dispense corrective lenses appropriate for a patient. If an examination indicates