Barometer help please

[markymark2406]

I’ve been given an old Barometer (pictured) I’m trying to set this up but can only find 1025mb on websites for todays pressure, how does this relate to the numbers on my barometer ?

 

[charliegolf]

I suspect the numbers on the face are 'inches of mercury' an older measurement. Natch the Americans still use it widely.

Have a look...

https://www.metric-conversions.org/pressure/millibar-to-inches-of-mercury.htm

1025 is around 30 and a 1/4 inches.

 

[Justin Passing]

Those numbers are inches. 1000mbar is 29.53 inches of mercury.

 

[RandomGrinch]

As above inHg...

 

[Old Salt]

Definitely inches of mercury. No pointer? The pointer is normally set by adjusting a screw at the back. Local airport, coastguard or weather station will give you an accurate measure if you ring and ask.

 

[Harry Bloomfield]

You may need to offset, for height above see level.

 

[RandomGrinch]

You may need to offset, for height above see level.

I found this on Google:

They are instructions for making the correction for height above sea level.
It might not be completely relevant to the OP's model but interesting none the less!

I especially like the part about "It is important that the barometer is hung vertically and glass tapped before reading'!