506 REPORT—1896. 
DIAGRAM 2, 
Zoe FH G& TRDC$ 
Bila 
oS 
Mean hig fee ee. 
Lad i f Ss 8 
oe A as 
SBS SER 
= w eS 
Pd & ee R S 
S| 5 mw! 
nee Sea aS er 
x 
S| : 
y N Ae 
‘ie 
“Aearus lo eter 2.5 2h 2a, WS, seat Se Bae 
Fixe low War NTE Stacia Vie wie beats 
GLASCOW 
An instance of this is afforded by the effect of the great anticyclone 
which occurred over the South of Europe in 1882, when the level of the 
water of the Mediterranean at Antibes was lowered a foot, owing to the 
exceptionally high pressure, the surface of several inland lakes being 
lowered at the same time. It is stated by Mr. Bell Dawson, C.E., in his 
‘Report of the Survey of the Tides and Currents in Canadian Waters, 
1894,’ that a difference of barometric pressure tends to produce a flow 
from the higher towards the lower pressure, and that ‘in the land-locked 
area of the Gulf of St. Lawrence he found that the atmospheric pressure 
influenced the flow of the water through the narrow inlets of that gulf, 
and that in the Gulf of Mexico, with a high barometer over the area of 
the gulf, and a lower pressure over the ocean outside, the speed of the 
Gulf Stream is appreciably affected.’ 
The effect of atmospheric pressure in raising and lowering the tides 
was investigated by Sir J. W. Lubbock and communicated to the Royal 
Society, the general conclusion he arrived at being that a rise of one inch 
in the barometer caused a depression in the height of the tides in the 
Thames of 7 inches, in the Mersey of 11 inches, and in the Avon of 
135 inches. The paper on the subject does not, however, give any 
adequate information as to the elimination of the effect of the wind from 
the calculations on which these figures are based. 
Admiral Wharton, the Hydrographer of the Admiralty, in his address 
to the Geographical Section at Oxford in 1894, stated that a difference of 
one inch in the barometer has been shown to be followed by a difference 
of one foot in the mean level of the sea, and that in those parts of the 
world where the mean height of the barometer varies much with the 
seasons, and the tidal range is small, this effect is very marked. 
This subject was brought before the Meteorological Society in 1886, and 
the Shipmasters’ Society in 1894, in papers read by Captain Greenwood, 
a 
