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:
How do you convert an acre measurement to feet? Dimensions of quarter-acre lots vary. Square footage is calculated by multiplying the lot length by its width to arrive at the square footage. If the resulting number equals 10, 912.5 square feet, it is truly a quarter-acre lot. Quarter-acre lots inevitably vary in dimension (length times width), but any combination of calculated dimensions count toward the total square footage.