Antique Tortoiseshell Obelisk Thermometer | 19th Century

A rare and elegant 19th-century obelisk-form thermometer, veneered in richly mottled tortoiseshell and fitted with a mercury thermometer and ivorine scale. Dating to around 1840, this beautiful instrument embodies the refined scientific taste of the early Victorian era and the enduring appeal of Egyptian Revival design. The obelisk form, rising from a stepped square base, was a popular motif in mid-19th-century decorative arts, symbolizing enlightenment and precision. The dual-calibrated scale (Fahrenheit and Réaumur) reflects a transitional period in European thermometry and adds a fascinating historical detail. This example retains its original mercury-filled tube, clear scale markings, and a deep, lustrous tortoiseshell surface — all characteristic of quality instruments produced by fine London or Paris makers of the time.