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The economy of the eyes: precepts for the improvement and preservation of the sight. Plain rules which will enable all to judge exactly when, and what spectacles are best calculated for their eyes. Observations on opera glasses and theatres, and an account of the pancratic magnifier, for double stars, and day telescopes.

Title:The economy of the eyes: precepts for the improvement and preservation of the sight. Plain rules which will enable all to judge exactly when, and what spectacles are best calculated for their eyes. Observations on opera glasses and theatres, and an account of the pancratic magnifier, for double stars, and day telescopes.
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Note:London : Hurst, Robinson & co., 1824
  
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Subject:Eyeglasses
Subject:Telescopes
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