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flash-lag effect
A visual illusion wherein a flash and a moving object that appear in the same location are perceived to be displaced from one another.
flash-lag illusions
flash-lag effects
plural of flash-lag effect
Muppet News Flash
Used ironically to introduce a sobering truth.
xenon flash lamp
A lamp that produces a very short, but very intense, flash of white light; used in photography and in photocoagulation
cap flashing
(roofing) Flashing, usually composed of metal, used to cover or shield the upper edges of the membrane base flashing; wall flashing can also be used to cover the top of various building components, such as parapets or columns.
blue flashes
plural of blue flash
base flashing
(roofing) Plies or strips of roof membrane material used to close-off and/or seal a roof at the horizonta-to-vertical intersections. Membrane base flashing covers the edge of the field membrane.
flashing collar
(roofing) an accessory flashing used to cover and/or seal soil pipe vents and other penetrations through a roof (sometimes referred to as roof jack or flashing boot).
step flashing
(roofing) Individual pieces of sheet metal material used to flash walls, around chimneys, dormers and such projections along the slope of a roof. Individual pieces are overlapped and stepped up the vertical wall.
