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:
The smallest possible perimeter for 1 acre is a circle. is 739.9 feet, and the diameter is 235.5 feet. The smallest possible straight measurements for a 1-acre rectangle is 834.8 feet. That's if it's a square, with sides = 208.7 feet. If the 1-acre is a rectangle but not a square, then the sides can be anything. longer than 208.7 feet. It only depends on how long and skinny the rectangle.