6Q6 



TIDES AND CURRENTS 



CoTiDAL Times of Places in E. Greenland (Koldewey, p. 665). 





MeanEsta- Correction 

 blishment. for Moon. 



Long. W. 



Cotidal 

 Time. 



Latitude. 





h, m. 



m. 



h. m. 



h. m. 





Nubarbik - - - 



6 30 



-13 



2 48 



9 5 



63 24 



Eleonoren Bay- 



10 45 



-21 



1 40 



12 4 



73 27 



Cape Broer Ruys 



10 51 



-22 



1 20 



11 49 



73 28 



Jackson Island 



11 3 



-22 



1 20 



12 1 



73 54 



Sabine Island 



11 14 



-23 



1 15 



12 6 



74 32 



Klein Pendulum - 



11 21 



-23 



1 14 



12 12 



74 37 



Cape Philip Broke 



11 28 



-23 



1 11 



12 16 



74 56 



Cape Bergen 



12 7 



-24 



1 12 



12 55 



75 26 



The difference in the establishments of high and low water is 

 the duration of the fall of the tide. 



In places receiving the direct ocean tide, the duration of rise is 

 greater than the duration of the fall of the tide ; but shallow water 

 tends to diminish the duration of the rise of the tide, and so makes 

 the rise shorter than the fall. 



The law of the velocity of tides as depending on the depth 

 may be well tested in Baffin's Bay by observations in different 

 parts from Cape Farewell northwards, and for this purpose sound- 

 ings should be taken at all points at which the time of high or 

 low water is observed. 



It is important to have observations on both shores of the bay 

 during two lunations. 



The heights of high water are different in two successive tides, 

 because of the action of the diurnal and semi-diurnal inequalities 

 combined, and the difference depends on the declination of the 

 moon. 



Near full moon the night tides are higher than the day tides in 

 the winter, but the night tides may be less than the day tides for 

 other positions of the moon. 



12. Average Depth of Davis Strait, Baffin's Bat, and 



Smith Sound. 



Distance. 



Diff. in 

 Cotidal hours. 



Velocity. 



Depth. 





miles. 



h. 





ft. 



Julianshaab to Whalefish 



680 



3-5 



194ni. per h. 



418 



Island. 











Whalefish Island to Port 



770 



4-35 



177 „ 



349 



Foulke. 











Port Foulke to Van Rensse- 



55 



•35 



157 



277 



laer Harbour. 











Hence the average depth of Davis Strait and Baffin's Bay 

 (according to theory) is about 383 fathoms, the length of the free 



