"Basics of Analog Computers" book

"Mark Gregory" <gregorym(a)cadvision.com> wrote: Hi It still can be a hybrid even though parts were digital and parts were analog. Looking at the date of the machine, I would suspect that most of the calculating functions were analog and not digital. It may have had digital function for things like turning lights on and off but controlling pitch and yaw indicators was most likely an analog function. Looking at the pictures, I didn't see any tube portions that looked like digital functions. Some of the panels look vary much like the typical analog plug-in units used in other analog computers. I vary much doubt that the altimeter, rpm or compass were run from a digital source. I would say that to qualify as an analog computer, it should do most of the computation in an analog manner. I would suspect that this unit had most of its calculations in the analog world and just a few status conditions held in digital form. Then again, if I saw a digital looking computer someplace in the pictures, I might change my mind. I didn't see anything that looked digital, other than switches and lights. Dwight