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alidade

Overview page. Subjects: Archaeology — Astronomy and Astrophysics.

A simple sighting device for measuring altitudes. It consists of a bar pivoted so as to swing in a vertical plane and be aligned with a celestial object. The object's altitude can then be...

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crown glass

Overview page. Subjects: Archaeology — Astronomy and Astrophysics.

A basic variety of optical glass, containing a high percentage of potassium and calcium. It has a refractive index of about 1.5, and on average has a lower dispersion of light than the...

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