of Inglehorough above the Level of the Sea. 



439 



comparable with those of our list they must be subtracted 

 from 41 ft. 6 in. (= 14 ft. lOin. + 26ft. 8 in.), when each day's 

 difference will stand as follows: 

 1832. 



July 7th . . + 5 inches. 



July 18th..— 2 inches. (July 29th.. + 3inches) 



At high 'water the difference of level between spring and 

 neap tides may be considered the same at both places. 



Call PO the observed height of the pole top above the sea 

 in a given state of the tide, and PH its corresponding mean 

 value for 1S32-3, derived from Holden's Tables. 1. At 

 spring tides* PH will be 23 ft. at mean high water, and 50*3 

 at mean low water. July 28th, 1832, PO was 22*6, and the 

 height of the tide (at Heysham) 29-3; whence PO would be- 

 come 51*3 at mean low water, spring tides. 2. At neap tides^ 

 PH is 29*6 at mean high water, and 43*3 at mean low water. 

 July 20th, 1832, PO was 28*10, and the height of the tide at 

 Heysham 18*3; whence PO may be stated at 465 at mean 

 low water neap tides. 3. At mean high water PH will be 



(23 + 29*6\ 

 j=26'35 or 26*2 by the mean of every day 



tide within the two years. 4. At mean 

 '50-3 + 43-6 



/ 50-3 + 43-6 _\ 



i6-10, and PO = 48-10 



low water PH 

 / 51'3 + 46-5 \ 



is 



2 / ' \ 2 



5. At the mean level of the sea PHwill be 36*6; the measure- 

 ments at Heysham give PO = 38 at neaps and 37 at springs, 

 mean 37*6 f. 



January 29th, 1823. Mr. Binns levelled from the canal at 

 Hest to the shore 400 yards to the northward, and thence 

 1923 yards on the sands to the lowest (?) part of the channel 

 of the KeerJ, and found the fall 76*9 (or 46*5 below the pole). 



• Spring tides were considered the two highest, and neap tides the two 

 lowest tides within a lunation. 



t At Liverpool the difference of level between springs and neaps is much 

 the same at high and low water, or about 7 ft. ; but at Heysham the dif- 

 ference at low water cannot exceed 5 ft. It may therefore be doubted 

 whether the lake subsides at spring tides to the level of the open sea. 



:{: " A small channel near the land at Hest was lower by 3 inches than the 

 point levelled to.'* 



