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 many feet in a half acre? There are no feet in an acre or in any part of it, but there are square feet. Foot is a unit of length or distance. Acre is a unit of area. 1 acre = 43,560 square feetâ¦ 1/2 acre = 21,780 square feet.