102 Mr. Goldingham’s experiments 
the velocity of sound, but were not brought forward. And 
a new building,* elevated so as to give a commanding view 
of the country, particularly of the Mount-f and Fort^, having 
been erected, I commenced a new series with the morning 
and evening guns of both places. The experiments with 
the Mount gun, it will be seen, comprise an interval, which 
embraces all the varieties of the wind and weather during 
the revolution of the sun ; the interval with the Fort gun is 
less, in consequence of the morning and evening guns having 
been fired from different parts of the ramparts, after the date 
at which the Fort experiments close. All the experiments 
were made with chronometers, which had 100 beats in 40 
seconds, sometimes by three observers, myself and two of 
the Observatory Bramin assistants, but generally by two : 
the observers having repaired to the station at the top of the 
Observatory building, a little before the expected time, and 
each holding his chronometer so that he could distinctly hear 
the beats, began to count the instant he saw the flash, and 
continued counting until he heard the report ; the number of 
beats between the flash and report was then immediately put 
down upon a slip of paper, by each observer, without com- 
munication with the others, and the papers delivered to me 
for their contents to be registered ; the height of the ther- 
mometer, barometer, and hygrometer, with the direction of 
the wind and state of the weather, were also observed at the 
time, and registered ; and in this manner the whole of the 
* The station on this building is about 55 feet above the level of the sea, distant 
in a direct line 4500 yards. 
f The Mount gun is about 120 feet above the level of the sea. 
J The Fort gun is about 30 feet above the level of the sea.. 
