Originally Posted by
rwanttaja
Agreed as to its being pretty; NOT so sure it's a flight computer. Yes, the bottom of it has a flight computer-like scale. But it also has little nubs or something to allow it slide atop something. Looks to me like this is designed to be placed atop a chart and the two arms used to show the bearing of two different targets.
One aspect is the scale on the arms...it only goes up to 110, which is too slow for any aircraft in the past 80 years and too fast for surface vessels. Note that the "Flight Computer" side doesn't have an index mark.
Speaking of marks, note the Broad Arrow proof mark at the 9 o'clock position on the top view. This indicates it was produced as Crown property in Great Britain. The lettering at the 1-2 o'clock position seems to say "9 (degree) CDC Mark 1". CDC..."Course Direction Computer", or something along those lines?
Ron Wanttaja