| advance. 
| 
Tarte I.—Elements of Waves ascertained by the author previous to the Meeting of the Association at Oxford in I847*. [To face page £6. 
] ‘Transverse direction oF lines of augmentation or diminution of pressure, | Winds forming the | f 
|. a = | parallel eurents, Amplitude.. || velo. 
2 Mean Ba-| Anterior slope or augmentation of pressure in advance | yfean Ba- Posterior slope or diminution of pressure following M ———— ahh city: 
Desig. | Peviod duriog which the ware) 7 ongitudinal dircetion of the creat, | rometnic of crest leunetre crest, cereale slope:| post, s IEEE eet ee ee ll References. 
aie, as vere trveming atu of , ae eRe olittuat ange Catal 2 
© j |“ auiterior Posterior | tion of | | minut ; ; : 
Direction. | Value, | trough. | Epoch. Direction. Value. | trough. | pressurein | f,, aaiaal| eC Lee 
|. 
| | 
} | h 
| Mar. 18. Greenwich 
» 19. Munich. 
| nerettters|ecesessseaseettasencenscnseescusteser sense! state 29°871 
29:975 
1 | 1841. March 18 to 19 ...} 
.| Report, 1845, p. 118. 
2 | 1811. March 19 
3 | 184), March 19....... 
4 | 1841. March 20 to 2 
.| Report, 1845, p. 118. 
:| Report, 1845, p. 118. 
.| Report, 1845, p. 119. 
29:98 
Mar, 21. Greenwich 
22, Prague, 
5 | 1841. March 24...,., 
in .| Report, 1845, p. 118. 
1841. March 26 to April 2 
Report, 1845, p. 119. 
29°900 
Mar. 30, nwich , 
» $1. Munich . 
NW, to E.S.E. 
W. to S.E. 30095 |. 
Noy. 1, Belfast to Paris.........| 30°290 | Noy. 1. 
6 | 1841. March 28 
8 | 1841. April 1 
No. 1 | 1842, Nov, L to7 . 
.| Report, 1845, p. 118. 
.| Report, 1845, p. 118. 
Report, 1846, pp. 161, 167. 
‘| Belfast to Christiania ‘| Nov. 3. | Christiania to Paris .. st. |Nov. 1. Paris 
; | s : | 5. St. Petersburgh. 
No.2, | 1842, Nov. 1 toll ...... Noy. 5. Cork to Orkneys ......| 30°335 | Nov. 5. | Belfast to Paris “80 | Nov. 9, | Paris to Orkneys 96 | 29°:050| wN.z. | s.w. | Nov. 5. Belfast .. Hf Receeearr 4 coecen| Report, 1846, pp- 161, 167. 
| | | | | » 9. Paris. 
a } . | Sth. Bishop to St. Catherine's Pat. Nov. 9. | Munich to Bardsey ,. ‘87 | 29-4087. ce GO | 1856 | 31 | Report, 1845, pp. 126, 127. 
Noy. 8. Scilly to Bardsey 
AL 1842. | Glasgow to St. Catherine’s Pnt.. Noy. 9. | Geneva to Brussels .. sessssees| Report, 1844, p. 270 (2). 
| 1845, pp. 126, 127. 
Report, 1845, p. 127. 
:| Report, 1846, pp. 161, 168. 
. | Dublin to Bardse: 
London to Christiania 
A2 1842. Noy. 9 to 10 stern seaeesene 
? Beit Noy. 11. | Christiania to Cork .. 
sa 1842, Noy. 7 to 12 
| Scilly to Longstone ... 
Report, 1845, pp. 124 to 128. 
| Bardsey to Longstone 
Report, 1844, pp. 271 to 277. 
» 1845, p. 127. 
.| Report, 1846, pp. 162, 168. 
Noy. 10. Dublin to Geneva 
Noy. 10, | Longstone to Scilly 
BI | 1842. Nov. 9 to 10 
. | Paris to Christiania .............. 
Noy, 15, | Orkneys to Cork ..-ceeceeseeseeee] “G4 Joccereee see] NeWe s.e. | Noy. 13. Paris .. 
| » 15. Orkneys. 
Noy. 18,| London to Orkneys ......... ecco) Oh) dL S383 S.w. | Nov. 16. Orkneys ........000+)scecscsesfensseeees 
| » 19. St. Petersburgh. 
No.5 | 1842. Noy. 12 to 16 ......| Nov. 14. Belfast to London .., 
No.4 | 1842, Noy. 16 to 19 ... | Orkneys to Paris 
sossssses] Report, 1846, pp. 161, 168, 
| 
7. | Belfast to Christiania 
No.7 | 1842, Noy. 17 to 19. 30°510 Nov. 17. Belfast Report, 1846, p. 162. 
No.9 | 1842, Nov. 19 to 20. 29-960 | Noy. 20. Orkneys Report, 1846, p. 162. 
Noy. 22, Cork .. 
» 24, Paris, 
Nov. 21. Belfast 
Noy. 24. Christiani 
29-590 || Cork to Paris .. Paris to Cork. 
No, 6 | 1842. Nov. 20 to 24 . Report, 1846, p. 161. 
. | Belfast to Christiania 
No, 11] 1842. Noy. 21 to 22 . 
No. 13) 1842, Nov. 23 to 24 . 
I, 1846. Nov. 2 to 17 
Il. 1846. Nov. 4 
Report, 1846, p. 162. 
Report, 1846, p, 162. 
Report, 1847, pp. 358, 369. 
Report, 1847, pp. 358, 364. 
Christiania to Cork ., 
| Arbroath to Galway ........ 
Ramsgate to Stornoway . 
Jersey to Limerick. | 
Noy. 4. Jersey to Limerick Report, 1847, p. 358. 
Report, 1847, pp. 359, 363. 
Report, 1847, p. 364. 
{1I. | 1846. N 
III*. | 1846. Noy. 6 to 9 
Ii*. 1846, Noy. 11 
N B e S.W, towards Arbroath 
.| Noy. 11. | Stornoway to Ramsgate ....... | 
Taure VII —Elements of waves as determined from the discussion of observations over the larger area included by Cork and Lovgan, Alten and Geneva. 
eens] Nov. 3. Alten 2. 
» 9 Longan. 
No. 2) 1842. Noy. 1 to 11 ......| Nov. 5. Cork to Alten .........| 30°330 | Noy. 5. | Belfast to Geneva .... «| *760| 29-790 | Nov. 9. | Geneva to Belfast ..........+. senses] *670 | 29°410 NEL s.w. | Now ey Beles ci ajeceeessee] 1577 | BSE 
» 9 Geneva. | 
Nov. l, Geneva, 14:22 
| | | » 5 St, Petes 
No.4 | 1842. Noy. 16 to 20... ..| Noy. 18. Brussels to Alten .,.| 30°520 . lice. ateerrecocobencna conse ConrermennerreHeosecreed peeece it we. | s.w. | Nov. 17. Belfast. 
| 
@, | 1842, Nov. 1t0 9 sssaeens] WiS.W, t0 BNE 30280 | Noy. 3. | Alten to Lougan ...... vssstssers] 19580) 29°038 | Nov. 9. | Lougan tO AWGN serssscsssscssve) °70B | 290412 vscssee vs) 288) 3184) 11 
| 465 | 29°786 | n.w. 
No.1 | 1842. Nov. 1 to 7 «......+.| Noy. 1, Belfast to Geneva ...| 30:300 | Noy. 1. | Geneva to St. Petersburgh *889| 29-449 | Nov. 5. | St. Petersburgh to Geneva 
| »» 19. Munich. | 
| i » 18. Alten. | 
| | » $20, Lougan. 
.| Nov. 2 | Alten to Christiania .......... esre| (ROA QD) learest ras tstscssechContsl Ee MURS 
No.0 | 1842. Nov. 1 to 2 ......0..|c0ee taenensenecseeres 
In connection with these Tables, it may be as well to solicit attention to the convergence of the lines indicating the transverse direction or lines of augmentation or diminution of pressure of the north-westerly systems of waves, disti\guishing the Scandi vian from that of Central 
Europe. It would appear that the transverse directions, or those in which the waves advance, are at right angles, or nearly so, to tangents appertaining to the general curvilinear directions of the coasts or junction lines of land and water, so that the directions of the waves nf Northern 
Europe more nearly approach the direction of the meridian than those of Central Europe. This appears strongly to indicate the proximity of land and water, as the locality of genesis of atmospheric waves, aud is greatly in accordance with the results obtained by Sir John Herschel 
and the late Professor Daniell, that the oscillation is greatest in such localities. Sce Report, 1846, p. 147. 
eo ee aaa ot 
_* Previous to my undertaking the present inquiry Sir John Herschel had determined the elements of two waves, one which traversed Western Europe in September 1836, the other in December 1837. The longitudinal direction of the crest of the first was S.S.W.—N.N.E.; transverse 
direction W.N W.—E.S.E; semi-amplitude in miles 540; in time 26 hours; velocity 21 miles per hour ; barometric depth 0-2 inch (Report, 1843, p. 70). The longitudinal direction of the crest of the wave of December 1837 was 10° W. of S.—10° B. of N.; transverse direction 10° N. of 
W.—10° S. of E.; velocity 1862 miles per hour (Report, 1843, p. 77 Thi: i i °, whi i ings to be lower in the neighbourhood of the Orkneys. 
¢ The velocity of this wave appears to have increased to about 26 miles per hour as it passed from the coasts of Wales towards the centre oft oe rag aiuaicaon ts anetloralppe af NS 3.902 HON cea ee J 
