Ewan ko sayo :D
A barocyclonometer is a type of aneroid barometer with accompanying diagrams and directions which help predict storms.
A BIG STANDARD!!... cause it ais accompanying grapgic diagrams.
This is an aneroid barometer, which has accompanying instructions and diagrams, intended to aid sailors in the interpretation of barometric readings. The 'cyclono' bit refers to cyclones that may still be distant, but whose barometric signature can be deduced.