Richard Twort is located in Weston-super-Mare, UK
Sympiesometer by Heath & Co, London
This is a Sympiesometer by Heath & co limited, Crayford, London S.E. Circa 1840. These instruments (this is an improved version) were briefly popular for a few decades up until around 1850 until the invention of the aneroid barometer, which proved to be more accurate and portable. This led to the majority of the sympiesometer to be discarded ensuring the surviving instruments were to become rare.
Richard Twort has clarified that the Sympiesometer by Heath & Co, London (LA320398) is genuinely of the period declared with the date/period of manufacture being 1840
Collect, Courier, Parcel force
This Sympiesometer by Heath & Co, London is located in Weston-super-Mare, UK