30 Mar
2021
30 Mar
'21
5:21 a.m.
the hammer fired to make an impression the ribbon on
the paper, which was
caused the noise people associated with computer printers.
GE outdid the printer with a fantastically fast pneumatic card reader. The make
and break of the suction on each card repeated at aural frequency and so loud
that I hied off to the instrument stockroom to borrow a noise meter. It was 90db
at the operator's position.
30 Mar
30 Mar
9:39 a.m.
New subject: Remember the ed thread?
I spent a few years working with a CDC 3800, which also had a pneumatic card reader, along
with several other noisy peripherals. Although I have no way to prove this, I suspect
that my current hearing issues stem from the noise in that machine room.
-r
On Mar 29, 2021, at 16:21, M Douglas McIlroy
<m.douglas.mcilroy(a)dartmouth.edu> wrote:
GE outdid the printer with a fantastically fast pneumatic card reader. The make and break
of the suction on each card repeated at aural frequency and so loud that I hied off to the
instrument stockroom to borrow a noise meter. It was 90db at the operator's position.
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Rich Morin