TIDAL OBSERVATIONS. 



123 



This table might be used for correcting all observed heights of the tide between 

 November 19 and December 10; but I thought it preferable to suppose that the 

 rope was at first correctly marked but changed afterwards. An examination of the 

 mean level of the sea indicated a small but somewhat abrupt increase in the reading 

 after the first high water of November 29th, and again a similar increase after the 

 first high water of December 4th ; I have therefore applied no correction to the 

 readings of the rope between November 19th and November 29th, 2 P. M. ; and have 

 applied half the correction between the last named date and December 4th, 6 A. M. 

 It seems that the apparatus was not in good working order during the last high 

 tide as the readings for four hours indicate some defect. After December 4, 6 A.M., 

 the full correction was applied. On the 11th of December the rope was taken up 

 and re-marked, and the readings from and after this date must be taken as correct. 



To obtain a closer determination than half an hour of the time of high and low 

 tide, the heights were plotted and a curve drawn through the points with a free 

 hand from which the time was made out with an uncertainty generally not exceed- 

 mg ten minutes. 



The times and corresponding heights will be given after the record of series two 

 of observations ; see Table I. 





Record of Tide observations at Port Poulke, Smith Strait. 











Second series. 1861. 







June 6 A. M. 



gh ggm ggftg 



11" 10° 17".85 



June 8 A. M. 



3" 50" 



12'*. 1 



H. W. 



40 .45 



20 .8 



L. W. 



4 00 



.0 



10" 00" 17". 8 



50 .6 



30 .65 



4" 10° IS^.O 



10 



11.8 



10 .85 



10 00 .7 



40 .4 



20 12.85 



20 



.9 



20 .8 



10 .75 



K. 



30 .75 



30 



.6 



30 .75 



20 .8 





40 .5 



40 



.5 



40 .7 



30 .8 



P. M. 



50 .4 



50 



.5 



50 .55 



40 .8 



L. W. 



5 00 .25 



5 00 



.52 



R. 



50 , .75 



4 00 11.55 



10 .1 



10 



.55 



P.M. 



11 00 .65 



10 .5 



20 .05 



20 



.6 



10 .6 



20 .5 



30 .05 



30 



.7 



L. W. 



R. 



30 .5 



40 .05 





S. 



3 00 12.25 

 10 .05 

 20 .0 

 30 11.95 





40 .5 

 50 .5 

 5 00 .9 

 K. 



50 .05 

 6 00 .25 

 K. 



10 00 

 10 

 20 



20.7 

 21.45 



June 7 A. M. 

 L. w. 



40 .95 



3 30 13.1 



n. w. 



30 



.6 



50 .9 



40 12.8 





10 00 18.1 



40 



.75 



4 00 .95 

 10 .95 



50 .6 

 4 00 .45 



n. w. 

 9 30 20.5 



10 .2 

 20 .35 



50 

 11 00 



.9 

 22.0 



20 .95 



10 .35 



40 .6 



30 .5 



10 



.1 



30 12.05 

 40 .15 



20 .25 

 30 .15 



50 .9 

 10 00 21.0 



40 .65 



50 .7 



20 

 30 



.15 

 .2 



50 .2 



40 .1 



10 .1 



11 00 .7 



40 



.2 



5 00 .25 



50 .15 



20 .4 

 30 .5 

 40 .6 

 50 .65 

 11 00 .65 



10 .72 



50 



.1 



10 .3 



20 .5 



R. 



5 00 .15 

 10 .2 

 20 .25 

 30 .3 



20 .7 



30 .62 



40 .45 



S. 



12 00 



.0 



s. 







P.M. 



R. 



10 .65 



June 



9 A. M. 



H. W. 





20 .65 



P.M. 



L 



w. 



9 00 19.65 



n. w. 



30 .6 



L. W. 



4 30 



13.3 



10 .9 



10 50 18.0 



40 .35 



3 30 12.55 



40 



.1 



20 20.1 



11 00 17.9 



K. 



40 .38 



50 



12.9 



