100 dukater. Avhandlingen är tryckt i Petersburger-akademiens Handlingar för 1762.
Bland de Klingenstiernska familjepapperen finnes i
anledning härav följande odaterade skrivelse av Dollond:
I acknowledge that Mr. Mallet when he was in London
shewd me a Letter which he had recievd from Mr.
Klingenstierna of Upsal, relating to Sir Isaac Newtons Law of
Refraction, in which it was evedently demonstrated that such
Laws were inconstant with the Nature of things. As soon
therfore as I saw reason to doubt of Sir Isaac, I thought it
high time to begin to think for myself, and endeavour to
find out the truth by Experiment. I therefore immediatly
enterd upon the Experiments which I have had the honour
to communicate to the Royal Society of London as may be
seen in the transactions and by which it appears that Sir
Isaac Newton was greatly mistaken in his notion of
Refraction. I there shew that I had found two sorts of Glass that
diverg’d the Colours very differently in equal Refractions,
for the white flint Glass in the same Refraction would
diverge the Colours as 3:2 in the Crown. That is if be
the ratio of refraction of white flint Glass for the red rays,
and the ratio of the violet; also the ratio of
refraction of the red rays in crown glass, and that of
the violet rays then would , altho the ratio of
was no more than 1,015:1. It also appears from these
experiments that Mr. Eulers hypothesis is wery far from the
Truth, for let the ratio of the red rays in crown glass
and that of the violet and let the ratio of the red
rays in white flint glass, then according to Mr. Euler
will be the ratio of the violet whence if this
theorem was true the ratio of the divergency of the colours
in equal refractions would be as . But the ratio of the
