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From an examnation of recently rediscovered examples of the simple microscope with spherical lens and specimen revolver, originally developed by Christiaan Huygens, the paper seeks to iIlustrate how the combined study of texts and objects is essential to establishing the evolution of an instrument. Some of the newly discovered Instruments are described and comment is made on the commercial forces w^hich acted in parallel with scientific ones on the development of this particular form of microscope

Microscopical advances: the posterity of Huygens´simple microscope of 1678