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net

(Encyclopedia)net, mesh fabric, known from prehistoric times. Nets have been made of many materials, including sinews, strips of hide, silk, vegetable and synthetic fibers, and metallic threads. Their earliest use ...

Carothers, Wallace Hume

(Encyclopedia)Carothers, Wallace Hume kərŭᵺˈərz [key], 1896–1937, American chemist, b. Burlington, Iowa. He received his doctorate at the Univ. of Illinois in 1924, then taught organic chemistry there and a...

logwood

(Encyclopedia)logwood, small, thorny tree (Haematoxylon campechianum) of the family Leguminosae (pulse family) native to tropical America and introduced into other tropical regions. The brown-red heartwood is the s...

Ashdod

(Encyclopedia)Ashdod ăshˈdŏd, ăshdōdˈ [key] [Heb.,=stronghold], city, SW Israel, on the Mediterranean Sea. It is Israel's leading port after Haifa. Construction is Ashdod's main i...

wool

(Encyclopedia)wool, fiber made from the fleece of the domestic sheep. In the United States, by the Wool Products Labeling Act of 1939, the term wool may be applied only to fabrics made entirely of new wool; t...

sodium sulfate

(Encyclopedia)sodium sulfate, chemical compound, Na2SO4. It is a white, orthorhombic crystalline compound at ordinary temperatures; above 100℃ it assumes a monoclinic structure, and above about 250℃ it assumes ...

linen

(Encyclopedia)linen, fabric or yarn made from the fiber of flax, probably the first vegetable fiber known to people. Linens more than 3,500 years old have been recovered from Egyptian tombs. Phoenician traders mark...

paper

(Encyclopedia)paper, thin, flat sheet or tissue made usually from plant fiber but also from rags and other fibrous materials. It is used principally for printing and writing on but has many other applications. The ...

cotton gin

(Encyclopedia)cotton gin, machine for separating cotton fibers from the seeds. The charkha, used in India from antiquity, consists of two revolving wooden rollers through which the fibers are drawn, leaving the see...

fiber optics

(Encyclopedia)fiber optics, transmission of digitized messages or information by light pulses along hair-thin glass or plastic fibers. Each fiber is surrounded by a cladding having a high index of refractance so th...