Yes, I have seen different units on each side of the zero point, John.
Not all possible combinations, of course; one would not pascals and
inches of water to share the same gage face. But I've seen pounds per
square inch on one side (above atmospheric pressure) and inches of
mercury on the other side (below atmospheric pressure). Gages of that
sort were on some of the used on air conditioning units and lines that I
sailed with on submarines.
Jim
John M. Steele wrote:
I agree with that. But have you ever seen them switch units at the zero
point on a gauge before? Switching from psi on the + side to in Hg on
the - side on a single scale is what is strange (to me). Maybe I led a
sheltered life.
--- On *Fri, 7/10/09, James R. Frysinger /<[email protected]>/* wrote:
From: James R. Frysinger <[email protected]>
Subject: [USMA:45341] Re: Vacuum display
To: "U.S. Metric Association" <[email protected]>
Date: Friday, July 10, 2009, 2:58 PM
No set of units has ever, to my knowledge, been constrained to use
only above or below atmospheric pressure.
Jim Frysinger
--
James R. Frysinger
632 Stony Point Mountain Road
Doyle, TN 38559-3030
(C) 931.212.0267
(H) 931.657.3107
(F) 931.657.3108
