Barometers Realm

Before us is the Maritime Rope Frame Barometer, dating to approximately 1880, associated with Anthony Casartelli — the well-known optician and manufacturer of scientific instruments whose Liverpool firm became one of the most recognizable suppliers of meteorological, optical, and navigational instruments during the late Victorian period. It is precisely his name that appears on the dial of the instrument; however, the passage of time and less-than-ideal storage conditions have caused some of the letters to wear away, including parts of the company address inscription. This also indicates that these inscriptions were likely added later and that Casartelli most probably acted primarily as a retailer, while the instrument itself was manufactured by Negretti & Zambra. The barometer belongs to the mature period of domestic aneroid development, when such devices were already perceived not merely as scientific instruments, but also as decorative interior objects intended for parlours, studies, and maritime households.

The case is carved from solid oak and executed in the popular “rope” pattern, imitating a twisted marine rope running concentrically around the entire circumference of the instrument. Such rope frame cases were especially fashionable in Britain during the second half of the nineteenth century, as they subtly evoked maritime themes and the aesthetics of naval craftsmanship. The carving is deep and highly reliefed: alternating ridges and recesses are carefully worked to reproduce the compression and intertwining of rope fibres. The diameter of the case is 19 cm. At the upper rear section is a brass hanging loop intended for wall mounting.

The dial is made of porcelain, now displaying a fine craquelure pattern caused by age and long-term thermal stress. Rather than diminishing the appearance of the instrument, this delicate web of cracks gives the dial a pronounced Victorian character and emphasizes the fragility of antique porcelain components. All scales, inscriptions, and decorative elements are executed monochromatically in shades of grey and black, creating a restrained yet graphically highly expressive composition.

At the centre of the dial is a large radiating star composed of alternating long and short rays filled with delicate linear ornamentation. In appearance it resembles both a compass rose and an astronomical emblem, becoming the compositional focal point of the entire dial. Around it runs the concentric barometric scale calibrated in London inches of mercury within the range from 26 to 31 inches, each inch being subdivided into fifty lines.

The textual weather indications accompanying the barometric scale are of particular interest from a typographic perspective. The words “Change”, “Stormy”, and “Very Dry” are rendered in a unified decorative Gothic style with sharp serifs and strong contrasts between thick and thin strokes; the word “Change” is additionally enriched with elaborate scrolling and floral ornament, transforming it into the visual centre of the upper dial. The second group of terms — “Rain” and “Fair” — is executed in a heavier and more monumental typeface, all letters being capitalized and filled with dense internal hatching, causing these words to visually dominate the remaining inscriptions.

The lower part of the dial contains the famous weather terms associated with Robert FitzRoy and their interpretations: “Falls” — for wetter, warmer, or more windy weather, and “Rises” — for colder, drier, or less windy conditions.

The dial is protected by a thick flat mineral glass with a faceted edge, mounted within a polished brass bezel. At the centre of the glass is a knurled brass knob intended for adjusting the trend indicator pointer and recording changes in atmospheric pressure over time.

At the heart of the instrument lies the characteristic movement manufactured by Negretti & Zambra. The central element of the mechanism is a brass aneroid capsule tensioned on a C-shaped steel spring. Variations in atmospheric pressure cause microscopic deformations of the capsule, while the movement is transmitted to the pointer arbor through a miniature fusée chain — one of the most elegant and technically sophisticated solutions of Victorian aneroid mechanics, inherited directly from horological engineering.

Overall, this barometer represents an exceptionally successful union of Victorian decorative craftsmanship and precision scientific instrument making. The oak case with its rope carving, the typographically elaborate porcelain dial, FitzRoy’s forecasting texts, and the refined Negretti & Zambra mechanism together form an object that simultaneously existed as a meteorological instrument, a decorative interior piece, and a symbol of educated domestic culture in late Victorian Britain.