John Mayall and Reproductions of Early Microscopes

As public interest in contemporary microscopy grew in Victorian England so did interest in the history of microscopy. This in turn led to the formation a small number of private collections. Unfortunately for collectors very few of the earliest microscopes survived.

Among the most highly prized microscopes were those made by Antoni van Leeuwenhoek, the famous Dutch pioneer of microscopy. After Leeuwenhoek's death in 1723, 26 of his silver microscopes were given to the Royal Society of London and were described by the Vice-President Martin Folkes. Their magnification powers were later examined in 1741 by Henry Baker, who also provides us with an illustration of their appearance in 1753 (Image 1). It is unclear when, but at some stage in the 19th century, all 26 of the microscopes were lost.

No illustrations were made of the Royal Society's Leeuwenhoek microscopes until 1753 and Mayall reports that even then "they do not give a clear idea of the construction of the instruments".(2) As one of the earliest 'microscopists', Leeuwenhoek was seen as a heroic figure and there was a history of speculation into how he was able to achieve his magnifications with such seemingly basic microscopes.

Mayall writes that "the general impression during his [Leeuwenhoek's] lifetime seems to have been that he utilized lenses consisting of spherules of blown glass", and that it was Henry Baker who in 1740 discovered that "the magnifiers were not spherules of blown-glass, but bi-convex lenses".(3)

Mayall is critical of Folkes' earlier report and claims it to have been done "somewhat vaguely" and appeared "not to have directed his attention minutely to their construction". Interestingly he misses that it was Folkes, not Baker, that first noticed Leeuwenhoek's lenses were bi-convex:

"For the construction of these Instruments, it is the same in them all, and the Apparatus is very simple and convenient: They are all single Microscopes, consisting each of a very small double Convex-Glass." (4)