Search results
Results from the WOW.Com Content Network
George Jacobs (1877 – 1945) was an American inventor, who invented enamel insulation for magnet wire. [1] He founded Dudlo Manufacturing, which became part of General Cable Corporation, and Inca Manufacturing, which became Phelps-Dodge Magnet Wire. [2] [3]
The Lower Paleolithic period lasted over 3 million years, during which there many human-like species evolved including toward the end of this period, Homo sapiens.The original divergence between humans and chimpanzees occurred 13 (), however interbreeding continued until as recently as 4 Ma, with the first species clearly belonging to the human (and not chimpanzee) lineage being ...
The Homestead Act granted 160 acres (65 hectares) to farmers who lived on the land for 5 years or allowed the farmer to purchase the land after 6 months for $1.25 per acre ($3.1/ha). Even as America's westward expansion allowed over 400 million acres (1,600,000 km 2 ) of new land to be put under cultivation, between 1870 and 1910 the number of ...
The taxonomy aims to classify innovation modes according to different sectoral groups and the flow of knowledge between such groups. It was first proposed by Science Policy Research Unit (SPRU) researcher Keith Pavitt at the University of Sussex and has since been applied in innovation research to describe and categorize industries and the ...
Joseph Henry (December 17, 1797 [1] [2] – May 13, 1878) was an American physicist and inventor who served as the first secretary of the Smithsonian Institution.He was the secretary for the National Institute for the Promotion of Science, a precursor of the Smithsonian Institution. [3]
In his Natural History, Pliny the Elder recounts a legend about a Magnes the shepherd on the island of Crete whose iron-studded boots kept sticking to the path. The earliest ideas on the nature of magnetism are attributed to Thales (c. 624 BC – c. 546 BC). [1] [2] In classical antiquity, little was known about the nature of magnetism. No ...
Magnetic hysteresis can be characterized in various ways. In general, the magnetic material is placed in a varying applied H field, as induced by an electromagnet, and the resulting magnetic flux density (B field) is measured, generally by the inductive electromotive force introduced on a pickup coil nearby the sample.
An 1880 penny-farthing (left), and a 1886 Rover safety bicycle with gearing. In business theory, disruptive innovation is innovation that creates a new market and value network or enters at the bottom of an existing market and eventually displaces established market-leading firms, products, and alliances. [1]