Barometers
The barometers we sell are of the
ANEROID type. That is to say the movement of the needle is controlled by the expansion and contraction of small metal bellows within the works, which are in turn connected via a hairspring to a metal spindle attached to which is a small chain.
It is this chain, which causes the needle to move in reaction to the bellows.
These bellows react to barometric pressure changes i.e. changes in the weather fronts and thus give an indication of a rise or fall, usually about 24 hours ahead.
The words on the Barometer face must be taken as general indications only, the main indicator being pressure related needle movement.
Setting your barometer
The needle is adjusted by means of a small screw usually located at the back of the movement.
It should be moved very gently, small movements at a time. To set up you can use either a known source e.g. an already set instrument or else you will need to obtain a reading from a local weather centre or the Met Office. Most local weather centres have a help line as does the Met Office and the London Weather Service. They will then give you a reading for the area in which the Barometer is to be used. This is most important since the reading varies depending on how far above sea level you actually live.
The reading given will be based on the Noon forecast and will either be in Millibars e.g. 1020,1012.1016 etc or in Barometric inches, e.g. 29.88,29.65,30.00 etc, the latter being the easiest to read on the Barometer face.
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