Watchmaker’s Measuring Microscope with Sliding Stage – Brass Scientific Instrument – Europe – Early 20th Century

This compact optical measuring instrument belongs to the tradition of precision tools used in horological workshops and scientific laboratories during the late nineteenth and early twentieth centuries. The device combines a small inspection microscope with a sliding measuring stage engraved with a calibrated scale. A clamping fixture allows small components to be secured while the user observes them through the eyepiece and advances the carriage along the scale to determine distance or diameter. Instruments of this type were employed by watchmakers and precision mechanics to examine and measure extremely small components such as wheel teeth, pivots, escapement parts, and other delicate elements of mechanical watches.

Constructed in brass and mounted on a heavy cast iron base for stability, the instrument demonstrates the precision machining associated with Central European instrument making. The adjustable optical head allows alignment of the lens with the workpiece, while the sliding stage permits controlled measurement under magnification. Such instruments also appear in laboratory settings where they were used for examining fine mechanical parts or occasionally small prepared samples. Wear to the base and surfaces reflects workshop use. Tools of this category represent an important stage in the development of optical measurement in precision industries such as horology, engineering, and instrument making.

Circa: Early 20th century (c. 1900–1930)

PROVENANCE  Thomas Guenther Collection.

MEASUREMENTS
Length: 18.6 cm
Height: 12.5 cm
Base diameter: 9.6 cm
Weight: 1.275 kg