knife edge - meaning and definition. What is knife edge
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What (who) is knife edge - definition


knife edge         
Foucault knife-edge test         
  •  From top: Parabolic mirror showing Foucault shadow patterns made by knife edge inside radius of curvature R (red X), at R and outside R.
The Foucault knife-edge test is an optical test developed 150 years ago to accurately measure the shape of concave curved mirrors. It is commonly used by amateur telescope makers for figuring primary mirrors in reflecting telescopes.
Knife-edge scanning microscope         
MODEL OF MICROSOCOPE FOR BIOLOGICAL IMAGING
Knife-Edge Scanning Microscope
The Knife-Edge Scanning Microscope (KESM) was invented and patented in the late 1990s by Bruce McCormick at Texas A&M University.Kathy Flores (2007).

Wikipedia

Knife Edge
Examples of use of knife edge
1. Drinks are called with this on a knife–edge already.
2. These could still produce knife–edge votes on the Bill.
3. Everybody must live on the knife edge of the global marketplace.
4. The government faces knife–edge votes on both issues this week.
5. "It‘s on a knife edge right now," said Michael Dicks, chief European economist at Lehman Brothers.