Preliminary identification
Photo reference
1 uploaded photo
Overview
A sophisticated scientific instrument featuring a visible internal vacuum capsule and a curved Celsius thermometer scale. Encased in a blackened metal frame with brass accents, it represents the peak of Victorian-era meteorological precision for the home.
Story
In 1844, Lucien Vidie revolutionized weather tracking by replacing toxic liquid mercury with a dry 'aneroid' cell. This French-made device allowed Victorian families to predict storms without a six-foot-tall glass tube.
Maker / Origin
The term 'Holosteric' was a trademark of Naudet, Pertuis, and Hulot (P.H.B.N.), the premier French firm of the 19th century. They were world-renowned for their accuracy, winning gold medals at the Great Exhibitions for their innovative 'all-solid' barometer designs.
Condition & Value
The dial shows some oxidation and 'foxing' consistent with age. The brass bezel has a lovely patina, though the black outer casing shows minor paint loss. Functional testing is required; if the vacuum cell is 'leaky,' value drops by 50%. Value is driven by the 'Holosteric' branding and the visible movement.
Full Research
Sold comps, value drivers, and venue guidance pulled from recent auction results.
Build on this identification
Layer in sold comps, value drivers, and venue guidance.
Comparable demand stays strongest where maker, originality, and venue confidence line up. Broader examples still trade, but the range tightens quickly when provenance, condition, or selling lane fit is missing.
Best Venue
Specialty auction or a focused dealer with buyers already in this lane.
Signed example with light edge wear and original frame.
Comparable format with stronger provenance and cleaner surface.
Smaller related piece with visible craquelure and trimmed margins.
Period match with softer condition and weaker subject matter.
Close market lane comp with similar material and presentation.