• Birds Through an Opera-Glass

    27 days ago - By Ornithology

    An ancient civilization cooking on a mound of sand discovered glass around 3500 BC but it wasn't until the 16 th century that glass was shaped into the first telescope in an arrangement of glass lenses that magnified objects up to 30 times. Later, double telescopes were created - the first binoculars - but awkward and of poor quality.
    Antique Opera Glasses, Nuremburg
    Optics slowly improved but binoculars were harder to create because they required two small telescopes to form one image from two. Most of these were in the form of opera glasses with a magnifying power limited to about 3X...
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