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84Kinds of Nails and Their Uses
A nail in carpentry, a thin, usually cylindrical metal device used to fasten two or more objects together. Nails have been used since ancient times and are still the fasteners most commonly used for joining wood, especially in building wood-frame houses. More than 60,000 nails may be used in a five-room house.
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80Quill Pen
Few instruments in the history of the world have played a more important part than the goose quill pen. Early mankind's written communications were mostly stylus inscriptions on clay or waxed tablets, reed writing on papyrus or parchment, and...
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85What is a Barometer?
Barometer, an instrument for measuring atmospheric pressure in order to predict probable local weather changes resulting from approaching fronts and air masses. The two basic kinds of barometers are the mercury barometer and the aneroid barometer. The mercury barometer is more accurate and reliable, but less sensitive, than the aneroid barometer.
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82Bricks & Tiles
Bricks and tiles are construction materials usually made by mixing finely ground clay or shale with water and firing, or baking, the mixture. Bricks may be solid or pierced with holes. They range in color...
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76Carpets
Although the terms "rug" and "carpet" are sometimes used interchangeably, the term "carpet" has come to refer particularly to a fabric that covers the floor completely and is fastened down, as in wall-to-wall carpeting. The term "rug," on the other...
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84Block Printing
Block printing is a process of transferring an inked image from a surface cut in relief to paper, fabric, or other material. The printing block is often of wood (sometimes of linoleum or a similar substance),...
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78Oysters
Oysters range from 4 to 6 inches (10-15 cm) in length. The valves (shells) of all oysters are dark gray and rough in texture. They are hinged at the narrow end by a tough elastic ligament, and they are opened...
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77The White House
The White House as it appears from the north. Photograph by David Lat. The White House is the official residence of the President of the United States, located in Washington, D.C. It is on Pennsylvania Avenue...
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81Maoris
The first inhabitants of New Zealand, Maoris are people of Polynesian descent who have lived in New Zealand since about the ninth century AD. Maori legends record that the Polynesian ancestors arrived in New Zealand in three fleets. The first...
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77Old Fashioned Candy
Consumption in the United States includes candy imported from various other countries, such as chocolates from the Netherlands and Switzerland, toffee and chocolates from Great Britain, chocolate cordials from France, and chocolate and nougat from Italy.
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