TIDES AND CURRENTS. 

 Height of the Tides. 



655 





Maximum. 



Minimum. 



Mean. 



May 

 June 

 July 



4 ft. 2 in. 

 3„ 7 „ 

 3„ 9 „ 



ft. 1 iu. 



1 „ 4 „ 



i 5> "J J5 



2 ft. 6i in. 



2 „ 7 „ 

 2 „ 8i „ 



At the quarters of the moon the low tides were much greater 

 during the day than during the night. Also, the evening high 

 tides reach their minimum 1^ days before the morning high tides. 



2. Parry's Second Voyage. — Observations on the Tides 

 Winter Island and Igloolik. 



at 



The observations on tides were carried on at Winter Island 

 from October 1821 to May 1822, and those at Igloolik from 

 November 18, 1822, to April 1823. The heights of the tides 

 were measured by means of a tide pole which was let through the 

 ice and moored to the bottom by a heavy weight. 



At Winter Island, the mean time of high water on full and 

 change days is 12h. 11m. 



The highest spring tide occurred on October 13, and was 15 ft. 

 8 in. high. 



The lowest neap tide on March 18 was 3 ft. 1 in. 



At Igloolik the mean time of high water on full and change 

 days was 7h. 28m. 



The highest spring tide on January 27 was 9 ft. 8 in., and the 

 lowest neap tide on February 5 was ft. 5 in. 



3. Tides at Port Bowen. (Parry's Third Voyage, &c.) 



" The great depth of water in which we lay at Port Bow en 

 prevented our observing the rise and fall of the tides during the 

 winter, by the usual method of a pole moored to the bottom. In 

 the spring, however, when the fire-hole alongside the ship could 

 not be kept constantly open, we adopted another plan, which it 

 may be useful to describe. A stove of about 3 cwt. was let down 

 the fire-hole to the bottom, having a whale-line attached to it. The. 

 line was rove through a block fixed to an outrigger from the ship's 

 side, and to its other end was fastened a weight of 50 lbs. By 

 this means the line was kept quite tight, and a marked pole being 

 attached to it, served to indicate with great accuracy the perpen- 

 dicular rise and fall of the v/ater. The observations being given 

 at length in the tide-table, 1 shall only here mention the fact, that 

 during nine weeks in the months of April, May, and June, the 

 morning tides were found, almost invariably, to rise several inches 

 higher than those of the evening." 



