A treatise on levelling, topography, and higher surveying (1876)
Gillespie, W. M. (William Mitchell), 1816-1868, Staley, Cady, b. 1840, ed · New York, D. Appleton and company · leaf 160
ide will be higher than the inferior tide. Thisdifference in the height of the tides is called the diurnalinequality. On the Atlantic coast, the successive high watersand successive low waters are nearly at equal heights aboveand below the mean, with intervals of 12 hours and 24minutes. On the… … The lengthening or shortening of the interval betweentwo high tides is called the priming and lagging of the tide. (222.) The heights of mountains and other points on thesurface of the earth are often referred to the level of the seaas a datum plane. The mean level of the sea is the mean be-tween…
Surveying
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