Charles Babbage and the Ophthalmoscope

In the early part of 1940, at one of the dinners of the Royal Society A Dining Club, Sir John Parsons drew the attention of those present to a fact of some interest in the history of the Society, namely, that the Ophthalmoscope had been invented by Charles Babbage, F.R.S., in 1847, four years before H. von Helmholtz published his Eines Augen-Spiegels in 1851. Von Helmholtz however foresaw the great utility of his invention and devised a much more efficient instrument without knowing what Babbage had done and it is to him therefore that the credit belongs. Babbage is well known as a mathematician who interested himself in the design and construction of scientific instruments. He was at Peterhouse, Cambridge, and was elected to the Fellowship of the Society in 1816. From 1828 to 1839 he held the Lucasian Chair of Mathematics at Cambridge, but is said to have delivered no lectures during his tenure of it. He took an active part in the foundation of the Royal Astronomical Society in 1820, and was secretary of it until 1824.