The bigger the rotor blades, the more energy they can capture from the wind. The giant blades (typically 70 m or 230 feet in diameter, which is about 30 times the wingspan of an eagle) multiply the wind's force like a wheel and axle, so even a gentle breeze is enough to make the outer edges of the blades turn around.he same thing happens in a wind turbine, only the dynamo generator is driven by the turbine's rotor blades instead of by a bicycle wheel, and the lamp is a light in someone's home dozens of miles away. Read more in our main article about generators.
The fur trade is a worldwide industry dealing in the acquisition and sale of animal fur. Since the establishment of a world fur market in the early modern period, furs of boreal, polar and cold temperate mammalian animals have been the most valued.
With the conquest of New France in 1763, the French trade shifted to Scottish merchants operating out of Montreal. After the negotiation of Jayâs Treaty (1794), the northern border was defined and trade along the Mississippi passed to the American Fur Company under John Jacob Astor. In 1821, the northern participants merged under the name of the Hudsonâs Bay Company, and for many decades this merged company continued to trade in furs. Finally, in the 1990s, under pressure from animal rights groups, the Hudsonâs Bay Company, which in the twentieth century had become a large Canadian retailer, ended the fur component of its operation.