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:
For example, to find out how many sq. feet there are in an acre and a half of a land, multiply the acre value by the conversion factor, that makes 1.5 * 43560 = 65340 square feet in an acre and a half. Acre is an imperial and US customary