Signed on the first draw, ‘Chadburn Brothers, Sheffield. Opticians to H.R.H. The Prince Consort’. With a main lens of 42mm diameter, 80 cms fully extended and 21.5 cms closed. The first draw has a short pancratic eye-piece giving magnification powers of between 26 x and 32 x. There are sliders to both ends, the lenses damage free and in good optical / working condition throughout.
Circa 1850s (Prince Albert died in 1861).
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I live in Lancashire (U.K.) and have been a dealer and collector of scientific and nautical instruments for a number of years. My stock has included some fine items from museums and colleges, which were surplus to their requirements. I occasionally purchase some interesting items from abroad, having established some reliable sources.