Italian Compound Microscope, 1670-1720 - the Optics

The microscope has three lenses: an eye lens, a field lens and an object lens. The lenses are held within two special housings, screwed into the wooden optical tube. The lens housings are both made of ebony combined with turned elephant ivory, representing very high degree of workmanship. The eye lens is covered by a protective ivory cup.

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The lenses

The three lenses (eye, field and object) are biconvex. They are made of clear glass (the field lens) and greenish glass (the eye lens and the object lens).  Their dimensions are as follows:

Eye lens: Ø 18.4 mm, thickness: 3.06 mm. The glass contains air some bubbles.

Field lens: Ø 22.4 mm, thickness: 3.1 mm. Contains tiny air some bubbles.

Object lens: Ø 7.6 mm, thickness: 2.0 mm. Contains tiny air some bubbles.

© Microscope History all rights reserved

© Microscope History all rights reserved

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