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It only mentions vertical adjustments, not horizontal, so I am guessing that it does some fun shenanigans with the (AC) filament "signal" to put horizontal bars into the cathode or grid of the CRT. These oddball items are fascinating to see now, like the gadget that went under damper tubes to increase the picture width.
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Chris
Quote from another forum: "(Antique TV collecting) always seemed to me to be a fringe hobby that only weirdos did."
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