RECOED AND RESULTS 



TIDAL OBSERYATIONS. 



The observations of the tides made by the Arctic Expedition of Dr. I. I. Hayes, 

 at Port Foulke, Smith Strait, in 1860 and 186J, consist of two series; in the first 

 are recorded the observed times and heights of high and low water in November 

 and December, 1860, the greater part of it com- 

 prising half-hourly observations. The second 

 series consists of observations of time and 

 height of high and low water in June and July, 

 1861. These observations were taken every 

 ten minutes about the time of high and low 

 tide. The total extent of these two sets of 

 observations is nearly two and a half months ; 

 a few accidental interruptions, however, occur 

 in each series. 



The tide gauge was of simple and effective 

 construction, as shown in the annexed wood 

 cut. It was a pulley gauge mounted upon the 

 ice field in the harbor. The pulley and rope 

 were supported by a tripod mounted over the 

 hole cut through the ice; the tide rope was 

 anchored at the bottom, and, in the first series, 

 was divided off in feet by proper marks ; in 

 the second series a pole was inserted upon 

 which the scale of feet was marked. The tide- 

 rope was kept stretched by a counterpoise ; this 

 weight rose and fell with the tide. A gauge of 

 such construction may be liable to disarrange- 

 ment from the following sources : the rope may 

 stretch, or the ice-field may have a slow motion 



and consequently incline the rope, or the stone may drag along the sloping bottom 

 from the effects of currents or ice motion ; if, from any cause, the apparatus fails, 

 the zero level of the scale is easily lost, and generally cannot be recovered. 



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