Ebonised fruitwood and brass-mounted siphon tube barometer

A rare unsigned ebonised fruitwood and brass-mounted siphon tube barometer. The barrel-shaped cistern base has the brass adjustment knob in the base and a gilt-brass collet at the top joining it to the spiral section with a further brass collet, joining it to the tapering straight section which supports the barometer hood, which is surmounted by three finials, the flanking finials rotate to adjust the blued steel index fingers on the register scales.
the register scales are formed of two silvered brass plates with foliate engraving top and bottom and the following weather inscriptions:
Very dry 31 / Hard Frost setl'd Fair / Setl'd Frost Fair 30 / Frost Variable
Rain 29/ Snowch M: Rain / ch M: Snow Storms 28 / Tempest