ClipArt ETC

The Tides ClipArt gallery contains 14 illustrations showing the cause of tides from an astronomical perspective as well as diagrams of tide contours.

This figure "shows the cotidal lines and the lines of equal rise and fall for a diurnal component in latitude 30 degrees north." -Coast and Geodetic Survey, 1901

Cotidal Lines

This figure "shows the cotidal lines and the lines of equal rise and fall for a diurnal component in…

The diagram shows cotidal lines projected for a larger body of water.

Diurnal Cotidal Lines

The diagram shows cotidal lines projected for a larger body of water.

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…

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…

If the earth were uniformly covered with a layer of water, the passage of the moon over any place as at <em>a</em>, would cause the water to lose its globular form, become bulged at <em>a</em>, and <em>b</em>, and flattened at <em>c</em>, and <em>d</em>. In other words, the water would become <em>deeper</em> at <em>a</em>, and <em>b</em>, at the parts of the earth nearest and farthest from the moon and <em>shallower</em> in all places 90 degrees or at right angles to these points.

Lunar Tide

If the earth were uniformly covered with a layer of water, the passage of the moon over any place as…

"The elevation of the tides at c and d is produced by the causes already explained; but their elevation is not so great as normal, since the influence of the Sun acting in the direction a b, tends to counteract the Moon's attractive influence. These small tides are called neap tides, and happen only when the Moon is in her quadartures." &mdash;Comstock, 1850

Neap Tides

"The elevation of the tides at c and d is produced by the causes already explained; but their elevation…

The flood tides are the highest, and the ebb tides are the lowest. These are called <em>spring tides</em>. They occur twice during every revolution of the moon-once at <em>full</em>, and once at <em>new</em> moon. When the sun and moon are 90 degrees apart, each produces a tide on the portion of the earth directly under it, diminishing somewhat produced by the other body. High tide, then, occurs under the moon, while the high tide caused by the sun, becomes by comparison, a low tide. Such tides are called <em>neap tides</em>.

Positions

The flood tides are the highest, and the ebb tides are the lowest. These are called spring tides.…

A diagram of semidiurnal and diurnal tide forces at various degrees of latitude.

Tidal Forces

A diagram of semidiurnal and diurnal tide forces at various degrees of latitude.

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…

"Let m be the Moon, and E the Earth covered with water. As the Moon passes round the Earth, its solid and fluid parts are equally attracted by her influence according to their densities; but while the solid parts are at liberty to move only as a whole, the water obeys the slightest impulse, and thus tends towards the Moon where her attraction is the strongest. Consequently, the waters are perpetually elevated immediately under the Moon. If, therefore, the Earth stood still, the influence of the Moon's attraction would raise the tides only as she passed round the Earth. But as the Earth turns on her axis every 24 hours, and as the waters nearest the Moon, as at a, are constantly elevated, they will, in the course of 24 hours, move round the whole Earth, and consequently from this cause there will be high water at every place once in 24 hours." &mdash;Comstock, 1850

Tides

"Let m be the Moon, and E the Earth covered with water. As the Moon passes round the Earth, its solid…

The figure "shows the effect of a circular island upon the cotidal lines." -Coast and Geodetic Survey, 1901

Island Tides

The figure "shows the effect of a circular island upon the cotidal lines." -Coast and Geodetic Survey,…