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In page Electrometer:
"A more sensitive form of quadrant electrometer was developed by Frederick Lindemann. It employs a metal-coated quartz fiber instead of an aluminum sector. The deflection is measured by observing the movement of the fiber under a microscope. Initially used for measuring star light,[citation needed] it was employed for the infrared detection[citation needed] of airplanes in the early stages of World War II.
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