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:
An acre is defined as one furlong (660 feet) by one chain (66 feet). 1 acre = 43,560 square feet of area. But the area doesn't tell you its shape or dimensions. on converting : 1 sq ft = 2.285 X10-5. 1 acre = 43,560 square feet. An acre is defined as one furlong (660 feet) by one chain (66 feet).1 acre = 43,560 square feet of area<br /><br />But the area doesn't tell you its shape or dimensions.on converting : 1 sq ft = 2.285 X10-5.