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A cathode ray tube works by sending electrons from the negatively charged cathode to the positively charge anode, which has a small tube to allow electrons to exit out in a focused line onto a screen. The screen is coate... More »

The cathode-ray tube, also called Braun's electrometer, was invented by Ferdinand Braun in 1897. The cathode-ray tube was the technology behind most displays, including televisions and computer screens, for over 100 year... More »

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Thomson’s cathode ray tube experiments were a series of three tests that determined the existence of electrons. Thomson used the experiments, beginning with his invention of the cathode ray tube, to better understand the... More »

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Thomson’s cathode ray tube experiments were a series of three tests that determined the existence of electrons. Thomson used the experiments, beginning with his invention of the cathode ray tube, to better understand the... More »

Neon lights work by applying high voltage to the electrodes at each end of a sealed glass tube filled with low-pressure neon gas. This ionizes the neon and causes it to glow. More »

Gamma ray telescopes use special detectors to measure gamma radiation from stars. Unlike conventional telescopes, gamma ray telescopes don’t take pictures or use optics. Instead, they create maps of gamma sources based o... More »

A kaleidoscope works by reflecting light that bumps into a reflective surface such as a mirror. It has two or more mirrors placed at an angle to each other. The mirror assembly is surrounded by a case, with an eyehole at... More »