Nevertheless, women were still a distinct minority of the 435 House Members; at their peak during this period, nine served in the 71st Congress (1929â1931). They lacked the power to focus congressional attention on the issues that were important to them.
NVG â Night Vision Green (495 nm): NVG LEDs, along with red LEDs, are useful for preserving night vision. NVG colored LEDs are useful for military pilots as well, who have special equipment that is designed to work with NVG lights. Blue LEDs are often used for map reading at night.
Late in the 19th century, many attempts to devise a portable electric lamp had been made, but the early ones were unsuccessful. Now a common household item, the lowly flashlight was once considered a novel toy. The first flashlight, or electric hand torch, was invented about 1896.