Spectroscope - Direct-vision comparison spectroscope - 1900-1910, 1910-1920 - Working optics

Early 20th Century Direct-Vision Comparison Spectroscope with Working Optics

This early 20th-century direct-vision comparison spectroscope is a finely made scientific optical instrument, most likely dating to circa 1905–1920. Although unmarked, its construction, black japanned finish, nickel-plated drawtube, direct-vision prism design and comparison mechanism closely resemble German and Austrian scientific instruments of the early twentieth century, making a Continental European origin the most probable.

Designed for visual spectroscopy, the instrument separates incoming light into its visible spectrum using an internal direct-vision prism system. Unlike simple educational spectroscopes, this example incorporates a more sophisticated comparison mechanism with a rotating optical assembly, focusing drawtube and hinged illuminating mirror, indicating laboratory or scientific use. Based on its construction and provenance, it was likely intended for absorption spectroscopy and comparative optical observations.

The optics have been tested and are working. The spectroscope produces a clear visible spectrum, as demonstrated in the photographs included in this listing. The focusing drawtube operates smoothly, the rotating comparison mechanism functions correctly, and the original hinged mirror remains present and functional.

The instrument was acquired as part of an old medical instrument lot, further supporting its probable laboratory or medical application, although no manufacturer's mark is present to confirm its original supplier.

It remains in honest original condition with attractive age-related patina. The main tube shows expected wear and losses to the original black finish, together with minor scratches and signs of use accumulated over more than a century. No heavy polishing has been carried out, preserving the authenticity and character of the original surface. Please study the photographs carefully, as they form an integral part of the description.

Dimensions (closed):

Length: 10 cm
Height: 2 cm
Depth: 3.5 cm
Weight: 100 g

Extended length: approximately 11.8 cm.

A rare and appealing scientific instrument for collectors of antique optical instruments, early laboratory equipment, medical history and the history of spectroscopy.

Carefully packed to collector standards and shipped with tracking.