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:
What are the dimensions of a square half acre? A square with an area of 1/2 acre has the following dimensions: Each of the four sides is 147.6 feet longThe perimeter of the square is 590.3 feet The diagonal measurement iâ¦s 208.7 feetThe area inside the square is 21,780 square feet.