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The first microscopes were produced around the same time as the telescope. They also had two or more lenses, but with an objective lens of shorter focal length. The invention is attributed to Galileo (1564-1642), although, in the 17th century, the claim was contested by others. Although the compound microscope originated with two or more lenses, the first research on insects, worms and organisms invisible to the naked eye was conducted with the simple microscope, which, coming into use in the second half of the 17th century, provided greater magnification and a higher degree of resolution.
The application traces the history of Galileo's microscope and the stages of microscopy in the Seventeenth and Eighteenth centuries. The various elements that compose it, its functioning, a short collection of anthological pieces on the Galileo microscope and the seventeenth-century microscopy and the instructions for building one at home are illustrated.