Actinometer is a measurement device use to measure solar radiation. An actinometer is a chemical system or physical device which determines the number of photons in a beam integrally or per unit time. This name is commonly applied to devices used in the ultraviolet and visible wavelength ranges.
What is the name for a net of fine lines or fibres in the eyepiece of a sighting device, such as a telescope, a telescopic sight, a microscope, or the screen of an oscilloscope?
What is the name of a device, consisting essentially of two wires of different metals, whereby heat energy may be changed to electrical energy?
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