Description
This listing is for a vintage hand-held optical spectroscope, believed to be by Broadhurst, Clarkson & Co. of London, complete with its original-style leather carrying case.
The faint maker’s inscription on the body appears to include Broadhurst Clarkson & Co. Ltd., 63 Farringdon Road, London.
This instrument may initially resemble a small monocular telescope, but it is not intended for viewing distant objects. It is a scientific spectroscope designed to separate incoming light into its component colours or spectrum.
The instrument incorporates an optical slit/prism arrangement at one end and an eyepiece at the other. A calibrated scale is also visible on the body, with markings including approximately 40, 50 and 60, corresponding to positions within the visible spectrum.
When correctly directed towards a suitable light source, the internal prism system allows the observer to examine the spectral colours and lines produced by that source.
These compact spectroscopes were used in scientific, educational and laboratory work and could be used for examining emission and absorption spectra.
Details:
- Type: Hand-held / pocket spectroscope
- Maker: Believed Broadhurst Clarkson & Co. Ltd. 63 Farringdon Road, London
- Country of origin: England
- Approximate date: Early to mid-20th century, probably c.1920–1950
- Construction: Blackened metal with nickel/chrome-plated fittings
- Optical prism/slit assembly
- Internal wavelength/spectral scale
- Adjustable optical section
- Length (when closed): 130mm
- Diameter: 16mm
- Leather carrying case included
Condition:
The instrument is in good vintage condition overall with age-related surface wear, marks, scratches and some loss to the black finish.
The optical components are intact.
Please note that this is not a monocular telescope, and a conventional image of distant scenery will therefore not be visible through it. Its purpose is to examine the spectrum of a light source.
The leather case shows considerable age-related wear, including rubbing, surface cracking, staining and marks, but remains a useful original period accessory.
The instrument has not been professionally calibrated or scientifically tested, so it is offered as a vintage scientific/optical collectible.
An interesting piece of British optical and scientific history, suitable for a collection of antique scientific instruments, spectroscopes, optical equipment or Broadhurst Clarkson items.
Please study all photographs carefully as they form an important part of the description.
