Vertical axis wind turbines (VAWTs) are devices to convert wind energy into electricity. Unlike horizontal axis wind turbines (HAWT) where the main rotor shaft is set horizontally, VAWTs use vertical rotor shaft. Unlike HAWTs, VAWTs can be...
Wind energy provides an attractive power source as an alternative to fossil fuels because it is abundant, clean, and produces no harmful emissions. To extract more energy from the wind we need to increase the wind turbine size. However, the...
Soldiers; Uniforms; Military personnel; Campaigns & battles; Indians of North America; Missionaries; Discovery & exploration; Ships; Lifeboats; Horses; Men
Woodblock prints of, from left to right starting at top left: man kneeling before group of men, mostly in military uniforms, one empty-handed, one holding a flag, one a cross, and others bayonets; men with spears, and one with a sword and a shroud,...
Busy and wide cobblestone street lined with buildings on either side. Streetcar tracks run down the street. On the street are streetcars and carriages. Pedestrians are on the streets and sidewalks. Elevated tracks run parallel to the left and...
