A diagram to show the principle of Helmholtz's ophthalmoscope. Pen and ink drawing.

Date:
1867
Reference:
16577i
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Publication/Creation

Leipzig : L. Voss, 1867.

Physical description

1 drawing : pen and ink ; image 18 x 24.3 cm

Lettering

Diagram to show the principle of Helmholtz's Ophthalmoscope. The optical arrangement ensured that the retina of the eye was illuminated by an almost parallel beam of light and that the beam of light was not cut off by the observer. ... Lettering continues: "A. The eye of the patient. B. The observer. SS. The mirror. L. and C. Lenses for giving an almost parallel beam of light"

Reference

Wellcome Collection 16577i

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