Liquid Settled Luminescent Screens

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Abstract
A distinction is made in liquid settling of fluorescent particles in television tubes between “wet” adhesion, i.e., adhesion of particles during tilt, and “dry” adhesion, i.e., adhesion in the finished screen. Wet adhesion in , salt solutions, silicate solutions, and in a complete system, | silicate | , is discussed. An apparatus to measure dry adhesion is described and it is shown that dry adhesion increases suddenly when a definite total amount of silicate in the settling solution is reached. This amount of silicate is a function of the surface, suggesting a “mortar” action of the silica between the phosphor particles.

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