main circulator
41Negative resistance — is a property of some electric circuits where an increase in the current entering a port results in a decreased voltage across the same port. This is in contrast to a simple ohmic resistor, which exhibits an increase in voltage under the same… …
42Dounreay — in 2006 …
43Forced-air — A Forced air or Warm air heating system is one which uses air as its heat transfer medium. These systems use ductwork and vents as a means of air distribution. The return plenum carries the air from several large return grills (vents) to a… …
44METRO Regional Transit Authority — METRO RTA Headquarters 416 Kenmore Blvd. Locale Akron, Ohio …
45Howard (CTA) — Howard 1649 W. Howard Street Chicago, IL 60626 …
46Austin, Texas — Austin redirects here. For other uses, see Austin (disambiguation). City of Austin   City   Downtown skyline as seen from Lady Bird Lake …
47Washington Metro — Not to be confused with Washington Metropolitan Area. Washington Metro Overview Type …
48Cincinnati streetcars — Four electric streetcars travel down Vine Street circa 1907. Cincinnati streetcars were the main form of public transportation in Cincinnati, Ohio at the turn of the twentieth century.[1] The original streetcar system was dism …
49Newark, Delaware — Coordinates: 39°40′45″N 75°45′29″W / 39.67917°N 75.75806°W / 39.67917; 75.75806 …
50Georgetown, Washington, D.C. — Infobox nrhp2 name = Georgetown Historic District nhld=yes caption = location = Roughly bounded by Whitehaven St., Rock Creek Park, Potomac River, and Georgetown University campus nearest city = lat degrees = 38 lat minutes = 54 lat seconds = 34… …
