center-of-pressure line
21Center pivot irrigation — Satellite image of circular fields characteristic of center pivot irrigation Center pivot irrigation (sometimes called central pivot irrigation), also called circle irrigation, is a method of crop irrigation in which equipment rotates around a… …
22Line-crossing ceremony — U.S. Sailors and Marines participate in a line crossing ceremony aboard USS Blue Ridge (LCC 19) as the ship passes the Equator May 16, 2008. It has been a long naval tradition to initiate pollywogs, sailors who have never crossed the Equator,… …
23pressure angle — noun : the angle between the line of force and a line at right angles to the center line of two gears at the pitch point …
24Spectral line — Continuous spectrum Emission line …
25Collapse of the World Trade Center — Coordinates: 40°42′41.12″N 74°00′44.00″W / …
26Green Line (Washington Metro) —      Green Line …
27Nuclear drip line — In nuclear physics, the boundaries for nuclear particle stability are conceptualized as drip lines. The nuclear landscape is understood by plotting boxes, each of which represents a unique nuclear species, on a graph with the number of neutrons… …
28Control line — Brodak Control Line Aerobatic Strega in flight Control line (also called U Control ) is a simple and light way of controlling a flying model aircraft. The aircraft is connected to the operator by a pair of lines, attached to a handle, that work… …
29Blue Line (Los Angeles Metro) — Metro Blue Line      Los Angeles Metro rapid transit line …
307 World Trade Center — Infobox Skyscraper building name=7 World Trade Center The new 7 World Trade Center (view from southeast) construction period=2002–2006 use=Office location=250 Greenwich Street New York City, New York, United States roof=741 ft (226 m) floor count …
