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:
one acre is about 4046 873 square meters a square plot of ground 208 7 feet on a side will cover an acre an american football field 360 feet by 160 feet is about 1 3 acres 12 high school basketball courts are a little more than 1 acreor example imagine a sidewalk 5 feet wide if it were 43560 5 8712 feet long it would take up an acre a long skinny acre on the other hand if the 1 acre lot were a square its sides would be only 208 7 feet long