On Thu, 20 Oct 2011 18:07:52 -0500, Jon Elson
wrote:


I presume anything close to that size is going to be a screw compressor...
But I could be indicating my lack of knowledge with that guess too.
Well, I did see some gigantic Ingersoll one-lung compressors in a
factory here on a tour. I was amazed they were from 1952. Gigantic
horizontal cylinder about 8 - 10" diameter and probably a stroke
of a foot.


It may have been driven by a low speed synchronous motor that was
supplying power factor correction in addition to driving the
compressor.

--
Ned Simmons