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 acres in 100 feet x 100 feet in acres? An acre is 43,560 square feet, so an area 100 feet x 100 feet (10,000 square feet) is about 0.23 of an acre, less than a quarter acre.+ 16 others found this useful.Deborah Gregory. Edit.n acre is 43,560 square feet, so an area 100 feet x 100 feet (10,000 square feet) is about 0.23 of an acre, less than a quarter acre. + 16 others found this useful. Deborah Gregory. Edit.