. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- Research. VISUAL INDICATORS 'pin-cushion' distortion is to produce a grid like Figure or b dependent upon whether Y plates or X plates are nearer to the cathode: this is clear I ff (a) (b) Figure for the former case from Figure When the beam leaves the region between the Y plates it encounters a fringe field possessing an axial compo- nent which retards it. In consequence it suffers more X deflection, leading to a grid of the Figure type. Retarding Deflecting force / force
. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- Research. VISUAL INDICATORS 'pin-cushion' distortion is to produce a grid like Figure or b dependent upon whether Y plates or X plates are nearer to the cathode: this is clear I ff (a) (b) Figure for the former case from Figure When the beam leaves the region between the Y plates it encounters a fringe field possessing an axial compo- nent which retards it. In consequence it suffers more X deflection, leading to a grid of the Figure type. Retarding Deflecting force / force. Figure Cossor double-beam electrostatic ft/Z^e—Cathode ray tube distortions may be minimized by special shaping of the electrodes and by the introduction of certain additional ones, the Fleming-Williams' curved anti-trapezium plate''. By the use of such techniques the Cossor double-beam tube is rendered feasible, in which the deflector plate drive is intended to be asym- metrical. Part of this is sketched in highly simplified form in Figure The beam is divided into two, whilst still in a diffuse state, by a 'splitter'. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Donaldson, Peter Eden Kirwan. New York, Academic Press
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