At 03:35 PM 3 March 2002 +0000, [EMAIL PROTECTED] wrote: >As I suspected, self-illuminated characters are treated differently. >This is because such displays are harder to read than painted >characters. I found a reference to 20 minutes of arc. If the person >doing this is an imperial only person then it is likely that they also >used an outdated 26 inch viewing distance (metric standards are often in >the range 600 mm to 750 mm). > >This works out at 0.15 inch....Did they give tolerances?
They gave the 0.15" as a minimum character height. I realize I left out what may clue us in to the 0.15" (presuming Terry's analysis is not how they got there). This is an RFP for a replacement/upgrade to an existing device. They may well have just measured the character height on the existing device and used that. Still doesn't explain the inches rather than millimeters. Due to the competitive nature of the RFP, and because I do not know who inhabits this list, I am hesitant to say much more about the actual application. The point of my original post was really just to say "hey, the military is doing its stuff in metric." One more segment of American society that has converted. And one that trains significant numbers of our young people. Jim Elwell
