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2572 V.3 Objective lens 1643 Evangelista Torricelli Glass, cardboard Diameter 54 mm |
Description Biconvex objective lens mounted in a cardboard ring. The aperture of the lens is 40 mm, the focal length 1480 mm, the diameter of the ring 54 mm. The glass, which has a red tint, contains elliptical bubbles and some inclusions. The lens is scratched. One side of the ring has an inscription ("V. Torr: 8.feb.1643") indicating the author (Evangelista Torricelli) and the date of construction. On the other side can be read "B. 2 ½", i.e. 2 ½ braccia (corresponding to 1460 mm, a measurement of the focal length). |
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