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Object Overview
This barometer is part of the private collection of our friend and fellow collector Heikki Vähäsarja (Finland). All photographs were kindly provided by him.
This Zenith Round Wall Barometer, dating from approximately 1955 and manufactured by the renowned Swiss watchmaking company Zenith, is a characteristic example of a post-war domestic aneroid barometer in which restrained exterior design is combined with an exceptionally refined internal mechanism. Despite its understated appearance, the instrument clearly reflects its watchmaking heritage, where equal attention was devoted to precision, engineering, and the craftsmanship of every individual component.
The case is formed as an almost perfectly circular wooden body with a gently rounded profile. It is turned from solid hardwood on a lathe, resulting in excellent axial symmetry and smooth, uninterrupted transitions between surfaces. The natural grain of the wood remains visible beneath a transparent protective finish, highlighting its warm honey-brown colour. At the top of the case is a substantial brass suspension ring with a threaded mounting, allowing the instrument to be hung directly on a wall.
24721
aneroid capsule tensioned on a C-spring
brass, glass, nickel silver, steel, wood
The front is deliberately restrained in appearance. A thin brass bezel secures a flat mineral glass, beneath which lies an almost completely undecorated dial. Mounted centrally on the glass is a red movable trend indicator, fitted with a knurled brass knob that allows the user to set it manually to the current barometric reading and subsequently observe pressure changes.
The dial itself reflects the functional minimalism characteristic of the mid-twentieth century. The barometric scale is arranged concentrically and calibrated in millimetres of mercury (700–790 mmHg). Around the outer perimeter are the traditional French weather indications — PLUIE OU VENT, VARIABLE, and BEAU TEMPS — printed in bold uppercase sans-serif lettering. The absence of unnecessary decoration further emphasises the instrument’s purely functional design. The indicating hand is made of blued steel, its slender profile balanced by a distinctive circular counterweight. The only inscription on the dial is the company name ZENITH, positioned discreetly at the bottom.
Despite the conventional appearance of the case, the true distinction of this instrument lies in its movement. The mechanism is based upon a finely manufactured German silver aneroid capsule, loaded by a curved spring mounted on a rigid steel crossbar, which provides the opposing force necessary for accurate and stable operation throughout the working range.
The movement of the capsule is transmitted through a refined system of steel levers. The initial displacement is carried by a long steel lever, pivotally connected to a vertical link, which in turn actuates a second bell-crank lever mounted on finely finished pivots. This kinematic arrangement converts the extremely small motion of the capsule into a sufficiently large angular movement of the indicating mechanism.
Particularly striking is the construction of the pointer-shaft bridge. The shaft is carried within a sculptural asymmetrical bridge whose silhouette resembles the blade of an axe. Its main body forms a broad curved plate incorporating a large triangular lightening aperture, reducing weight while preserving rigidity. Toward the centre of the mechanism, the bridge gradually narrows into a cantilevered arm terminating in the bearing supporting the pointer shaft. The overall architecture is far more reminiscent of a high-grade watch movement than of an ordinary household barometer and represents one of the most recognisable design characteristics of Zenith mechanisms.
Motion is transmitted to the pointer shaft by means of a miniature fusee chain (chaînette), a construction traditionally associated with fine watchmaking. A particularly interesting feature of this mechanism is the slender guide extending from the outer edge of the bridge to the fusee-chain prolongator. This guide supports the entire fusee-and-prolongator assembly, preventing the chain from sagging while ensuring smooth and stable transmission of motion. Although seemingly insignificant, this elegant engineering detail perfectly illustrates Zenith’s philosophy, in which not only reliable operation but also the refinement of every mechanical solution was considered essential.
Taken as a whole, this barometer is an excellent example of how one of Switzerland’s foremost watch manufacturers successfully transferred the traditions of precision horology into the field of domestic meteorological instruments. Behind its modest and almost austere exterior lies an exceptionally elegant movement whose architecture, finish, and engineering sophistication clearly reveal its watchmaking origins. It is this refined internal construction—rather than the simplicity of the case—that makes Zenith barometers immediately recognisable and particularly desirable among collectors of historical scientific instruments.