ioo Mr . Goldingham’s experiments 
made here agrees, in a very satisfactory manner, with that 
given by Sir Isaac Newton’s theory, and by the two other 
celebrated men just named. 
Between the years 1793 and 1796 a considerable number 
of observations were taken by myself, and under my super- 
intendence, at the Observatory, with the view of ascertaining 
the velocity of sound. Not having the exact distances of the 
guns from the station when I returned to England, I wrote 
for farther information upon the subject — which I had not 
obtained when I quitted Europe again. I therefore did not 
bring these experiments forward at the time ; and having a 
more elevated station to observe from, by the erection of a 
new building, and the advantage of corroborating distances, 
by the trigonometrical survey carrying on under the super- 
intendence of Colonel Lambton, I entered upon the course of 
experiments about to be detailed. The former experiments 
(those of 1793 and 1796) were made with Arnold’s chro- 
nometers, as were these now given. In examining works 
obtained from libraries here, since I closed these experiments, 
for information relative to the results of like experiments by 
other observers, I found a letter from Colonel Beaufoy, in 
the Annals of Philosophy, addressed a few years ago to Dr. 
Thomson ; and recommending to be done in England, what, 
in all the essential points, has been performed here, as will 
appear by the following extract : 
“ It has frequently excited my surprise, as well as regret, 
and in which I am no wise singular, that use has not been 
made of the admirable Trigonometrical Survey, begun by 
the late General Roy, and continued with so much ability 
and attention by Colonel Mudge and Professor Dalby, to 
