Hard disk material

[Jules Richardson]

William Blair wrote:
>> (My brain wants to say it was "how to build a working digital 
>> computer", but I could be wrong there). I wonder if anyone ever
>> actually built one that worked? :-)
> 
> Your brain is not leading you astray.  That's the book.  Here's the PDF version:
> 
> http://www.bitsavers.org/pdf/paperClipComputer/HowToBuildAWorkingDigitalComputer_Jun67.pdf

That claim of some drums operating at 75,000rpm has to be a typo... I can 
believe 7500 - but 75,000? Ouch!