Screwbarrel microscope by Culpeper in black sharkskin case, early 18th century

The screwbarrel microscope was introduced in the mid 1700s. It was very popular as it was a cheap, portable microscope that was simple to use. The lenses could be changed easily and were stored in ivory mounts. Six lenses were usually provided with the microscope. Focus was adjusted by screwing the barrel up or down. The ivory slides could hold four specimens. The micro-scope also came with extra slides and covers so more specimens could be studied. This item was made by Edward Culpeper (1670-1737), an optical instrument maker based in London.