Mr William Galbraith on the Tides and Dew-Point. 15 
Whence the position of mean tide or level of the sea below the top 
of Broddick Pier, can be determined by two different methods, of 
which the results are given in the following table, from 2d August to 
5th August inclusive. ‘ 
The whole has not been reduced, because I had not an apparatus 
to record the times and heights of the tides at those hours which I 
have found it either inconvenient or dangerous, such as at 11, 125, 
at night, or 1h, 2h, 3", &., in the morning. 
No. 
~ 
SOON OOF ON eH 
Date. | Time. |.noter.(Fahr| water-|waver.| Rise | Garr | Risst (Second! trate erage 
Tide. | Tide. 
1849.| a. mu. In. ° | Feet. | Feet.| Feet.| Feet. | Feet.| Feet. Feet. | Feet. 
Aug. 2,) 11:0 a.m.|30°20| 60 | 6°40 Ai at Ae ah She dais 
2,| 5:5 P.M.|30°20} 60 | ... |12°60| 6°57|+0:22| 6-79] ... Sb4u\s <2: 
2,/11-20 P.M.|30:20| 59 | 5:67] ... ae I? FRO al haze tll eae 9-40 
3,| 5°25 A.M./30°20} 60 | ... |12°80] 6:76/4+0°22| 698]... 9:64 eee 
3,/11-40 a.m.|30°20] 60 | 6:41] ... ee oi See, Gre Pees 9:88 
3,| 5°50 P.M./30-20| 60 | ... {18:00| 7-07 |+0:22| 7:29] ... S69N) 22 
3,| 12:0 P.m.|30°20} 60 | 5-45] ... ts a Rese ess sai i 9-72 
4,| 6:20 a.M./30°20] 60 | ... {14°10} 8:46/+0°-22| 8-68] ... |10:09 | ... 
4,) 0°30 p.m.|30-20] 60 | 5°83] ... ot Ses 7°94 Son 9:91 
4,| 6°45 p.m.|30°10} 61 13°00 aae pele 
Mean position of half tide under the Pier, 
The rise of the tide each day is also given, of which 
4)38-96|4)38-91 
“974 973 
that on the m 
orning of 
the 4th is the greatest, being 8-68 feet near the time of full moon, though the 
highest is generally later than this. 
The highest by far, that I observed, was that on 12th August 
1849, the day on which, I believe, the Queen left Belfast Loch, 
and run for safety over to Loch Ryan.* By the table it will 
be seen that the barometer stood very low, 29°25 in., or, corrected 
for temperature, 29°20 inches, while the wind was blowing fresh, 
and increasing almost to a gale, nearly in the direction of the coming 
tide. That is, two circumstances combined to produce the very high 
tide, which rose to within 3:50 feet, or 3 feet 6 inches of the top of 
the pier. To allow for the effects of the low barometer we have 
* | first observed the Royal squadron come in sight of Broddick at about 
8 o’clock of the morning of 13th August 1849, 
