I was just looking at the old HP clock manuals I rescued from the obsolete NRAO files. There are a few things of note.
1. HP made a special version of the 113BR clock and the 103AR oscillator called the H02 version. This provides sidereal time by use of a 1.00273791 MC crystal. 2. HP used what appears to be an IBM Executive typewriter to write some of their errata. They appear to have commissioned a special typewriter key with the HP logo. It's the old lower-case stylized hp in a circle. This also shows up in the manuals themselves, but I think the manuals were typeset due to their high quality. This errata was clearly produced on a proportional pitch typewriter. 3. Other errata appear to be typed on a non-proportional typewriter. One has the special HP logo (using two character spaces), the other substitutes a typed -hp- for the logo. 4. Yes, it was my twin brother's Selectric Typewriter Museum that was used as the "expert source" in the 2004 Bush memo scandal. All this typewriter font stuff is blindingly obvious if you look closely at the characters typed on the page. -- --David Forbes, Tucson, AZ http://www.cathodecorner.com/ _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
