> If the 115 has no motor (and I'm not questioning you, Bill) what moves the
> "digital" numbers? It looks like a clock drive, and the 1968 HP catalog
> makes reference to an "additional drum," which also sounds like a motor
The 115 does have a motor; the digital readout works like an odometer.
Here's four of many photos of a 115BR and 115CR:
The last photo (hp115cr_4.JPG) is particularly nice.
Note also the NNN.NNN millisecond advance/retard feature. This is done with an
analog phase resolver and digital turn counter.
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