"Chris1011" wrote in message
...
I think a seismograph
would be a more reasonable, and interesting project.

Having worked at Bausch & Lomb in the early '60s, where they had many
ruling
engines working 24/7, I can tell you that they were all pretty good
seismographs.

Roland,

I would think so. Did they make everyone where soft-soled shoes and tread
lightly in the halls and stairs?

Clear skies, Alan