"strain gauge" or "gage"?

When referring to a device that measures tensile or compressive force, is the correct spelling strain gauge or strain gage?

I realize that in general gage is an archaic spelling of the word gauge, but which spelling should be used in this compound? (Context is an engineering dissertation on signal processing)

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Solution 1:

It's "gauge", whether it's a strain or a fuel gauge. Or a narrow gauge railroad, or a 12-gauge shotgun.

In my personal opinion it should be "gage" in all these cases because it is definitely not spelled the way it is pronounced. But who cares what I think?

"gauge" is the correct spelling in most cases, but "gage" does get used in technical situations, as Dictionary.com indicates.

Here's Dictionary.com's version. The spelling "gage" is an occasional variant, but mainly for technical use (see gage). Gage is largely an archaic spelling, and in one archaic use, a gage is "something, as a glove, thrown down by a medieval knight in token of challenge to combat."

Solution 2:

There are actually companies whose business is the manufacturing of what I have always known as gauges and whose company name includes the word "Gage". What I have found is that there are some who believe gage is correct. I'm sticking with gauge. Gage is just wrong to me.

Solution 3:

I work in a testing lab and we generally use gage when referring to the strain sensor .. gauge is used as in "hydraulic pressure gauge" however both spellings have been used here frequently in the 20 years I have worked here. No one has said we must use one spelling in preference over the other with reference to strain sensors..