An ivory simple microscope compendium

The Wilson screw-barrel microscope is first described in the Philosophical Transactions of the Royal Society in 1702, a handle is added to later models, examples of which are often seen in fishkin cases. Clay & Court illustrate a similar ivory pocket cylindrical microscope in The history of the microscope in fig. 25, which is signed by Edward Scarlett. Another, with three compartments, was sold as part of the Sir Frank Crisp collection at Steven's in 1925 (lot 7) appearing chronologically before the other screw-barrel types.