Co-tidal lines of the Atlantic Coast of the United States. 17 
| TABLE No. 2. 
Co-tidal hours of ports on the Atlaniie coast. 
: meg 5 Co Tiere 
2) 8 [e3 = gas 
Za leg [eee || 2 FESkl. 
Ce ist FiSs2s| 8| 8 [Semel § 
hom [hom | hom |m.| hm.) hem ' 
1\*Cape Sable,...........ce0e: 8 50| 4 23/1313 |18|1255|..... 26 
ol*Ellenwood’s Island, ......... 945/424) 14 9/19/1850) ..... a 
3|*Fourchue Island, 10 00 | 4 25] 1425 |20/14 5)..... 47 
4\*Portland, Maine,............ 11 25) 441/16 6 | 23) 16 43) --... a 
/*Portsmouth, N. Ho... 2.2... 23 
6 *New! bury por t, Mass... 
‘ipswich, oe octets 
§|*Gloucester, mang kes See 
9 salem, igs eb Or" 
10|* Nahant, aeitneke 
mij boston Light, * ...... 085 
19\*Boston Dry Dock,........ niet 
— 113\* Wellfleet, . 
ae 14\"Provineetown, Ces os Ree ees 
BR OUGTOY, owes os an wane od 
cet eee eer ee seeee 
ee 
PPe ee eeeeernse 
Weise Adela 
28!*Point 4, ith : ewport harbor), 
ed 
re 
“Siaboan Geen 
2l* Fort Poles i te Pacey) 
t. John’s 
ee ener 
44/09. “tae ar 
45)*Cabe Yio sera iA etna 
——_——~ 
Supposing the stations to be really connected in the physical 
group and assuming that the space over which the observations 
extend is such that the co-tidal lines may be taken as straight 
lines, we obtain by least squares the position of the co-tidal li 
Which will best satisfy the equation. mean latitude 
_ Stoonp Seams, Vol. XXI,No. 61—Jan, 1856. —e 
