TIDES AND CURRENTS. 



665 



between the brig and the islands. This action has caused a 

 secession of the main floe ; ow vessel has changed her position 

 20 feet within the last two spring tides, and the hawser connected 

 with Butler Island parted with the strain." 



Note. — Under these circumstances it seems hardly necessary 

 to make allowance for the rise of the ship in consequence of the 

 consumption of food by the crew during the winter. 





Port Foulke. 



Van Rensselaer^ 



Sabine Island. 



Average rise and fall of tide 



7-7 ft. 



7 • 9 ft. 



3-11 ft. 



Extreme fluctuation of high 



7-3 „ 



8-4 „ 



— 



water. 









Ditto, of low water - 



5-2 „ 



9-0 „ 



— 



Ditto, in water level - 



13-8 „ 



16^6 ., 



— 



Mean establishment of high 



llh. 13- 8m. 



llh. 43-3m. 



lOh. 53 •7m. 



water (\i). 









Ditto, of low water - 



17h. 19-5m. 



17h. 48^0m. 



17h. 6^1m. 



Retardation of R.A. (o) for 



8° 36' 



5° 15' 



16° 4^' 



high water. 









Ditto, for low water - 



10° 30' 



12° 30' 



13° 0' 



Value of J for high water - 



•3624 



•367 



•4305 



Ditto, low water 



•3665 



•471 



•4019 



Range of half-monthly di- 



Ih. 26m. 



Ih. 52m. 



Ih. 42m. 



urnal inequality in time. 









Ditto, in height 



2-4 ft, 



3-0 ft. 



1-38 ft. 



Cotidal hour and minute 



1.5h. 43m. 



16h. 04m. 



llh. 47m. 



High water (moon's tide) in- 



llh. 24m. 



llh. 52m. 



— 



terval. 









Duration of fall of tide 



6h. 05 • 7m. 



6h. 04 •7m. 







( = difference of establish- 









ments) . 









Duration of rise of tide 



6h. 18 •7m. 



6h. 19 •7m. 



— 



To obtain the cotidal time, the mean establishment must be 

 added to the longitude west of Greenwich, and a correction of 

 Im. in half-an-hour made for the moon's motion. 



In this way the cotidal time of places in W. Greenland are as 

 follows : — 



MeanEsta- Correction j ^„„ -nr 

 blishment. for Moon. -^°"^- ^ • 



Cotidal 

 Time. 



Latitude. 



Julianshaab 



Fredrikshaab 



Holsteinborg 



Whalefish Islands 



Godhavn 



Upernavik 



"Wolstenholme Sound 



Port Foulke 



Van Rensselaer Harbour - 



Polaris Bay 



h. m. 



m. 



h. m. 



h. m. 



4 56 



- 9 



3 04 



7 51 



5 53 



-12 



3 20 



9 1 



6 20 



-13 



3 35 



9 42 



8 5 



-16 



3 33 



11 22 



8 50 



-18 



3 34 



12 6 



10 50 



-22 



3 44 



14 12 



10 58 



-22 



4 36 



15 12 



11 14 



-23 



4 52 



15 43 



11 43 



-23 



4 44 



16 4 



12 3 



-24 



4 7 



15 46 



60 35 

 62 

 66 56 



68 59 



69 12 

 72 47 

 76 33 

 78 18 

 78 37 

 81 38 



