Question

Straight trajectories within these devices were first demonstrated via Maltese cross-shaped shadows. Ferdinand Braun pioneered these devices by using a "cold" component to supplement thermionic emission. In these devices, two pairs of deflection coils determine position on a phosphor screen. Evacuation of these devices was improved by William (*) Crookes, who demonstrated deflection (10[1])by pressing (10[1])magnets (10[1])against them. These devices were central to the earliest oscilloscopes. J. J. Thomson used these devices (0[1])to discover the electron. Liquid crystals and OLEDs have supplanted the inclusion of these devices in electronic displays. For 10 points, name these devices found in analog television screens. ■END■ (10[1])

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