On Thursday, February 6, 2020 at 3:37:29 PM UTC-5, Commander Kinsey wrote:
On Thu, 06 Feb 2020 20:31:23 -0000, Cindy Hamilton wrote:

On Thursday, February 6, 2020 at 9:49:40 AM UTC-5, Commander Kinsey wrote:
On Thu, 06 Feb 2020 14:27:40 -0000, charles wrote:

In article op.0fkjut2bwdg98l@glass,
Commander Kinsey wrote:
Why do barometers have different centre readings? I thought 1000 mbar was
average, as that's what barometers always used to have as the central
reading ("change"), but Wikipedia says it's 1013. I've seen some newer
ones with 1010 as the centre.

On mine it's 29.5 inches

Phwoar! ;-)

All mine have both measurements. It would appear it should be corrected for altitude, but that would mean a rotatable dial.

Dial? My barometer is a column of mercury.

My god how old is that?

I'm not sure. My husband salvaged it from work, and the building it was
in dates back to the 1950s.

Cindy Hamilton