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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.

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Glossary: microscopy

The use of microscopes to study objects or samples. The three major types of microscopy are optical, electron and scanning probe microscopy.

Glossary: screwbarrel microscope

A microscope that can be separated into many pieces and carried in a case.