ON THE HOURLY OBSERVATIONS OF THE THERMOMETER. 183 
sophical instruments is well known and appreciated. It agrees 
well with a fine thermometer by the late Mr. Crichton of 
Glasgow, made by him expressly for meteorological observa¬ 
tions, and with which I am led to believe he took more than 
ordinary pains. 
The thermometer used by Mr. Harvey was also obtained 
from Mr. Cox, and agreed well with that at the Dockyard. 
It was placed in the Artillery Square at Devonport in an appro¬ 
priate screen of wood, fixed against the walls of the line of bar-t¬ 
racks facing the north, about 90 feet above the level of the sea 
and distant from it about a quarter of a mile. The sides, back, 
and roof of the screen were formed of double planks, filled in 
between with sawdust, so as to shelter the instrument as much 
as possible from local heat and other disturbing causes*. The 
non-commissioned officers who went round with the relief guard 
entered the observations in a printed form most judiciously 
drawn up and supplied by Mr. Harvey. Acknowledgements 
are due to Serjeant Anderson of the Artillery, and others under 
his guidance, for the great care and attention which they be¬ 
stowed on the register. 
On comparing the mean results of the two registers, from 
their commencement in May, 1832 to the termination of Mr. 
Harvey’s in July, 1833,— or at least such perfect portions as 
admitted of comparisonj,—we find but little difference between 
them, as may be perceived in the following table which contains 
the mean temperatures for each month. It will be perceived that 
the numerical coincidences are very striking, more especially 
when we take into account the circumstance, that the results in 
the one case have been deduced from an observation taken every 
two hours only, the other from hourly observations. 
1832. 
Registers. 
May. 
June. 
July. 
Aug. 
Sept. 
Oct. 
Nov. 
Dec. 
Dockyard .. 
53-70 
58-6 
61*40 
61-20 
58-30 
54-10 
49-40 
47-40 
Artillery Barracks. 
53-98 
not cbserved 
throughout. 
62-20 
61-95 
58-27 
53-20 
47-97 
not observed 
throughout. 
1833. 
Registers. 
Jan. 
Feb. 
March. 
April. 
May. 
June. 
July* 
Dockyard . 
Artillery Barracks. 
41-70 
40-42 
46-80 
45-99 
41-80 
41-07 
48-40 
48-29 
58- 
59- 31 
57-47 
57-86 
61-30 
61-74 
* See Second Report , p. 574. 
f The observations were occasionally interfered with, in consequence of the 
regiment being sent on military and other service. 
