130 



REPORT — 1864. 



May, and ceasing at 12 o'clock at noon on the 6th of June of the present year. 

 The books in which the whole of the observations were entered are herewith 

 presented to the Association. 



In order, however, to give a more readily comprehended explanation of the 

 results of our labours, the entire sets of observations have been drawn in sec- 

 tion by contour lines, as will be seen by the accompanjdng drawings, also now 

 presented to the Association. The vertical lines give the hours and minutes 

 of the observed time of the tides in rising and faUing, and the horizontal lines 

 or divisions give in feet and inches the observed height of such rise and fall. 

 The red line running through each section represents the datum line of the 

 mean rise of the sea at Livei-pool, as given by the Ordnance Survey Board, 

 in the published work entitled " Abstracts of the principal lines of Spirit 

 Levelling in England and Wales, by Colonel Sir Henry James, E.E., F.R.S., 

 &c." The zero of the tide-gauge in each case is represented by a dotted 

 line on the section above or below the red line, as the case may be : that of 

 Naburn Lock is 1-680 feet above the said line; Goole is 3-823 feet below; 

 Gainsborough 3-140 feet above ; and HuU 14-707 feet below. The tidal 

 wave is represented by the blue contour lines. 



During the whole of the time the observations were being made the 

 weather was not undily influenced by either rain or wind, and therefore the 

 tides were natui'al and of a regular character. 



The phenomenon as to the time of high water above a certain point of the 

 Hull Dock gauge, referred to in the last Eeport, is again verified, i. e. when 

 the tide has reached the 16-feet mark of the tide-gauge above the dock-sill, 

 or 1-293 feet above the mean rise of the sea at Liverpool, it then, in every 

 tide, wants exactly three hours to high water. 



Tidal Observations taken at the Ship Lock, Goole, as to the time of high 

 water after the tide has reached the 8-feet mark, by Mr. Thomas Kendall, 

 Dock Master. 



