During the survey, a register of the rise and fall of the tides was regularly kept at Hynish on the neighboring Island of Tyree [1].
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From those observations it was determined, that the rise at that place is between twelve and thirteen feet at high spring tides, and three feet at dead low neap tides [1].
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Observations subsequently made while the works were in progress, gave the same results at the Rock of Skerryvore [1].
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It is high water atthe Rock atfullandchange ofthemoon, atfivehours andtwenty -fiveminutes [1].
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An interesting fact was also noticed regarding the mean level of all the tides which had been watched… viz., that the point halfway between the high and low water of every tide is on one and the same level [1].
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