Historic mercury barometer, heirloom from Ohligs, North Rhine-Westphalia, Germany, 19th century. Top scale states 'Barometer / Pariser Maasz (<i>old German style: Maaſs</i>)'. i.e. 'Parisian Scale' and artisan's name 'verfertigt Peter Franken' (manufactured by Peter Franken). Lid of lower casing raised to enable view of mercury receptacle and wooden stopper at the upturned end of the glass tube.  Height without hook: 950 mm.
<a href="//commons.wikimedia.org/wiki/User:Franz_van_Duns" title="User:Franz van Duns">Franz van Duns</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>