The DC motor was the mainstay of electric traction drives on both electric and diesel-electric locomotives, street-cars/trams and diesel electric drilling rigs for many years. The introduction of DC motors and an electrical grid system to run machinery starting in the 1870s started a new second Industrial Revolution.
One acre is 43,560 sq ft. One half acre is 21,780 sq ft. However, that doesn't help most people much when trying to picture how large a lot is. Half acre lot is roughly:
So an square acre is 208.71 feet by 208.71 feet.For an acre that has a rectangular shape, the area formula is given as length multiplied by the width. Since the area is 43,560 square feet, the multiplication of length by width dimensions of the acre must be equal to this area. This means that a rectangular acre can have any dimensions, such as 1 foot by 43,560 feet, 2 feet by 21780 feet, 10 feet by 4356 feet or 660 ft by 60 feet.