probably made in London
This 'variable microscope', made in silver (pictured here with its fitted case) was made around 1770, probably by George Adams, senior (1704-1773), a scientific instrument maker based in London. Adams held various appointments, including that of Mathematical Instrument Maker to the King by 1760. The microscope was designed by John Hill (1717-1792), who illustrated it in his 1770 book, The Construction of Timber. Its idiosyncratic mounting may have originated in an idea of John Stuart, 3rd Earl of Bute, who was Hill's patron.
The main arm of the stand is engraved 'C W Dixey/ Optician to the Queen/ New Bond Street/ LONDON'. Dixey probably refurbished the instrument and replaced the name of Adams with his own, and replaced the box. The accessories include a set of seven numbered objectives, six liberkuhns, forceps, a set of four micrometer glasses, a simple microscope objective arm, frog plate, sub-stage micrometer slit, additional sprung stage, specimen needle with rack and pinion micrometer adjustment, and a set of six coloured and plain glass slides.
The 'variable' microscope was made by Adams from 1770, but after his death in 1773 the model appears to have been dropped by his son; few examples survive. The silver has been analysed, and shows that it is 'probably middle to late eighteenth century'. It may well have 'escaped' from the Royal Collection, as a contemporary diary for 12 December 1845 states that '[James] Smith [the specialist microscope maker] exhibited a microscope at [the] Microscopical [Society of London] modernised for the Queen. It was of silver and at one time cost £900.'
To search on related items, click any underlined text below.