Looking for old computer book
jwest at classiccmp.org
Fri Mar 30 09:24:09 CDT 2007
>> In the back of the book it has plans for building a computer out of basic
>> components, including a telephone dial for input.
To which Mike replied...
> Take a look at item #270101277189 on Ebay, in the completed section. Is
> that it?
It may well be the one that Paul saw and was asking about. But just as
another datapoint, I too remember as a kid seeing a design for a computer
that used a telephone dial for input and it was not the same one as pictured
in the ebay article that Mike pointed out.
The one I saw was more "horizontal" in appearance with the dial on top,
whereas the one on the ebay auction is more "vertical" and has the dial on
the front. I also remember that the one I had seen definitely had a lot more
An off-topic side-note:
I can not recall what media I saw this in. It could have been a
radio-electronics magazine, an old book from the local library (as a kid I
spent several hours every day in the library soaking up books on various
interests), or it may have been in the worldbook (I think that was the name)
encyclopedias. I had a set of regular encyclopedias that also had science
projects for many major subjects. These werent usually trivial experients,
they were things that would be suitable for presenting in a school science
fair for judging. I distinctly remember two of the projects. One was on the
working of the heart. It was a board that tilted front to back on a
triangular wedge. Routed into the board was a logical diagram of the human
heart. The valves were one way metal flaps that opened by rotating on a thin
metal shaft or wire. The blood was a set of marbles. When you tilted the
board to the back, the marbles rolled through the valves in one direction,
then when you tilted it back the other way the flaps only let the marbles go
into the correct chambers. There was also a project showing air pressure...
it was basically two sealed mason jars, each half full of water. There was a
common pipe between them, then each one had a separate pipe just going out
the top not connected to anything. One of the open pipes you put a balloon
on. When you moved one jar higher than the other the balloon would inflate.
Anyways, I wonder if the telephone dial computer project I saw was in the
same encyclopedia set.
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