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This figure shows "the cotidal lines and lines of equal amplitude for a diurnal tide in a circular sea of 20 degrees radius, the latitude of the center being 30 degrees north." -Coast and Geodetic Survey, 1901

Diurnal Cotidal Lines

This figure shows "the cotidal lines and lines of equal amplitude for a diurnal tide in a circular sea…

The figure shows the harmony and syzygy of tides in four different places (the four corners of the square).

Tide Theory, Square

The figure shows the harmony and syzygy of tides in four different places (the four corners of the square).

The figure shows the harmony and syzygy of tides in four different places (the four corners of the square).

Tide Theory, Square

The figure shows the harmony and syzygy of tides in four different places (the four corners of the square).

The figure shows a 30 degree triangle made from a square depicting the harmony and syzygy of tides in four different places (the four corners of the square).

Tide Theory, Triangle

The figure shows a 30 degree triangle made from a square depicting the harmony and syzygy of tides in…

The figure shows a 30 degree triangle made from a square depicting the harmony and syzygy of tides in four different places (the four corners of the square).

Tide Theory, Triangle

The figure shows a 30 degree triangle made from a square depicting the harmony and syzygy of tides in…