WAVES OF THE ATLANTIC AND GERMAN OCEANS. 31 
lbs. to a 5 , Ibs. to a 
Square Foot. : Square Foot. 
Dates. 
Nov. 8427 
eee eee We 3199 
ar 4112 
ate H 1369 
AS oes 9 2738 

A more exposed point of the Skerryvore Rock was at this time chosen for 
experiment; and with the view of ascertaining the effect of the waves at different 
heights upon the rock, two instruments were fixed, the one (No I.) several feet 
lewer, and about 40 feet seaward of the other (No. II.) It was observed, that 
about half-flood the force of the waves was a good deal expended before they 
reached the place where No. I. was placed, from there being so little water on 
the rocks outside. Whereas when the tide was higher the waves were, from the 
greater depth of water, not so much broken when they reached No. II. The re- 
sults of the Marine Dynamometer shew generally about twice the force at No, II. 
as at No. I.; a result which shews how important it would be to ascertain the 
relative forces of the waves at different levels upon our breakwaters and other 
seaworks. 
Pressure in Ib. 
Date. Remarks. No. of per 
Instrument. | Square Foot. 


————————— 
1845. 
Jan. 7 Heavy sea. : 1714 
bane, «poe Bie ee : 4182 
12 Very heavy swell. - 2856 
se ee ace : 5032 
16 Heavy ground swell. : 2856 
oar aoe me c 4752 
22 A good deal of sea. . 2856 
tee ves 000 : 5323 
28 Heavy ground swell. : 2627 
Aone got Mie ae : 4562 
Feb. 5 Fresh gales. , 856 
21 sae ue : 1827 
one eas Se . 3422 
24 Fresh breezes. : 1256 
“oc 008 a se : 3802 
March 9 | Ground swell. . 1256 
Waves supposed about 
‘- 10 feet high, Sis 
tf Short sea. : 1028 
24 Heavy sea. . 2281 
Waves supposed about 
-_ { 20 feet high. ee 
26 Swell. 6 1256 
rib Waves about 6 feet high. : 3041 
Strong gale, with heavy 
sea, the highest waves : 2856 
29 supposed 20 feet high, 
and the spray rose c 6083. 
about 70 feet. 

