1819.] Dr, Burney’s Meteorological Observations. 451 
Rain, &c. 
Inches. 
Greatest quantity, in April... 0.6... eee eeeee Whkekeae 263 
Least quantity, in August ...,.--.sseeeeeeeees Pee ee Lael 
Total quantity that fell in the year. ............ spuateie to 
Beside the above-named phenomena, there appeared aninverted — 
solar bow, of delicate prismatic colours to the eastward, at 6 a.m. 
on May 9; one perfect lunar rainbow to the westward at 45 mi- 
nutes past 7, p.m. on Sept 16; and Aurora Borealis between 
= N.N.W. and N.E. points, from 11 o’clock till midnight of 
et'S1; 
N.B. The barometer is hung up in the observatory, about 30 
feet above high-water mark; and the self-registering horizontal 
day and night thermometer, and De Luc’s whalebone hygrome- 
ter, are placed in an open case near a wall, in a northern aspect, 
out of the sun’s rays, and 10 feet above the level of the garden. 
The pluviameter is manufactured of mixed metal, its recipient 
art is cylindrical, and the area of its funnel six inches square : 
it has a small pipe spout, with a cap at the end to prevent evapo- 
ration. Every morning at 8, a.m. after rain has fallen, it is 
emptied into a cylindrical glass gauge, accurately graduated to 
_ _i,th part ofan inch. 
The evaporator is a lead vessel, exactly of the same area, 
exposed with its contents to the sun and winds in dry weather. 
The quantity evaporated is ascertained by measuring every third 
day. 
Both these instruments are placed clear of all obstructions on 
the top of the observatory, 22 feet above the level of the garden. 
Barometer. 
The mean atmospheric pressure on the barometer is not so 
great this year as last by =!,th of an inch; nor is the maxumum 
height so great by ~,th of an inch. This seems contrary to 
what might have been expected, considering the high tempera- 
ture since the middle of May, and that additional solar influence 
is known to raise the barometrical column in a small degree. 
The only rational way in which this can be accounted for is from 
the lowness. of the barometer during the first five months, when 
the elasticity of the atmosphere was much disturbed by frequent 
gales that blew mostly between the south and west points, so as 
to cause the average height of the mercurial column to be 3th 
of an inch below the annual mean, as shown in the table. The 
range of the mercury, however, is greater than it was last year 
by ;3,ths of an inch, and as great, perhaps, as it has ever been 
observed in this neighbourhood. 
With other common barometers that were observed here 
when the maximum tnd minimum ocewred, the annual range 
2¥2 
