Kelvin Hughes made a display for collision avoidance that refreshed itself every 3 or 6 minutes, may have been more. The display was about a 30” cathode tube that didn’t need a hood in daylight unlike radars of the period. All it showed were the tails of targets and in a vessel doing 27 knots in the English Channel we thought it was the greatest thing since sliced bread. We called it the Tadpole bowl.
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