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Eyepiece
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Inv.
2574 V.9 Eyepiece lens 1666 Eustachio Divini, Rome Glass, cardboard, Florentine paper Length 107 mm, diameter 63 mm |
Description Biconcave eyepiece lens mounted in a cardboard ring covered in red marbled paper. The diameter of the lens is about 35 mm, the focal length -94 mm (the negative focal length means that the lens is diverging). On the ring is the inscription "Eustachio Divini in Roma 1666 Acuto per Palmi 26", i.e. diverging eyepiece for a telescope of 26 palms (corresponding to 5780 mm). The glass has a slight yellow tint and shows some bubbles and inclusions. The lens is contained in a section of cardboard tube covered in red marbled paper. The tube, 107 mm long and 57 mm in diameter, has a nineteenth-century label with the same inscription as on the ring. |
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