grown function photocell
1Selenium — (pronEng|səˈliniəm) is a chemical element with the atomic number 34, represented by the chemical symbol Se, an atomic mass of 78.96. It is a nonmetal, chemically related to sulfur and tellurium, and rarely occurs in its elemental state in nature …
2photography, technology of — Introduction equipment, techniques, and processes used in the production of photographs. The most widely used photographic process is the black and white negative–positive system (Figure 1 >). In the camera the lens projects an image of… …
3Schafer automation system — The first Schafer Automation System, installed at KGEE(AM) in Bakersfield, California in 1956, was dubbed the blue wire job because all of the wiring in it was blue, its inventor, Paul Schafer said. The owner wanted to program his station all… …
