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.
Decide what type of microwave oven you want. Countertop models are the most conventional kind of microwave. They range in size from 18 inches wide and 11 inches high (45.7 cm wide and 27.9 cm high) to 24 inches wide and 14 inches high (61 cm wide to 35.6 cm high).