Thomas A. Edison Papers. Electric Generator. In the fall of 1878, after experiments indicated that existing arc light generators were inefficient for incandescent lighting Edison and his chief assistants, Charles Batchelor and Francis Upton, investigated generator design and the principles of electromagnetism.
Size. The standard width of a residential range is 30 inches, but higher-end ranges can extend to 36 inches and beyond. The oven compartment on a typical range is 5 cubic feet, compared to just over 3 cubic feet in a typical wall oven.
Commercial kitchens use the full size, 26 x 18 inch sheet pan. These dimensions are too large for standard size home ovens. Also used frequently is the three quarter 2/3 pan. Its dimensions are suitable for different types of baking.