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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.…

During the prevalence of the simoom, particles of fine sand are carried into the atmosphere and obscure the light of the sun. Becoming intensely heated, these particles, by their radiation, increase the temperature of the air, which sometimes rises as high as 120 degrees or 130 degrees Fahr. When powerful winds prevail, dense clouds of sand are carried about in the atmosphere, producing the so-called sand storms. The sand-drifts which are thus formed constantly change their position.

Sand Storm in the Desert

During the prevalence of the simoom, particles of fine sand are carried into the atmosphere and obscure…

A native of America, is extensively cultivated from the southern part of Chili to high latitudes in North America. Its northern European limit is perhaps near the isotherm of 65 degrees Fahr.

Maize

A native of America, is extensively cultivated from the southern part of Chili to high latitudes in…

Wing of an owlet-moth, with all the markings defined and named.-Right wings: b, basal line; t.a., transverse anterior line; m, median line or shade; t.p., transverse posterior line; st., sub-terminal line; t., terminal line; sm., sub-median vein; apex of hind wing; o.m., outer margin; i.m., inner margin. Left wings: b.d., basal dash; cl., claviform; or., orbicular spot; ren., reniform spot; ap., apical spot; c.m., costal margin; o.m., outer margin; i.m. inner margin; h.a., hind angle; d.s., discal spot; e.l., exterior line; an., anal angle.

Owlet Moth

Wing of an owlet-moth, with all the markings defined and named.-Right wings: b, basal line; t.a., transverse…

Cameo, a term applied to gems of different colors sculptured in relief. The art of engraving on gems boasts of high antiquity, having been practised with various degrees of success by the Egyptians, Greeks, and Romans.

Cameo

Cameo, a term applied to gems of different colors sculptured in relief. The art of engraving on gems…

A right triangle with degrees 1, 89, 90.

Right Triangle degrees 1, 89, 90

A right triangle with degrees 1, 89, 90.

A right triangle with degrees 2, 88, 90.

Right Triangle degrees 2, 88, 90

A right triangle with degrees 2, 88, 90.

A right triangle with degrees 5, 85, 90.

Right Triangle degrees 5, 85, 90

A right triangle with degrees 5, 85, 90.

A right triangle with degrees 6, 84, 90.

Right Triangle degrees 6, 84, 90

A right triangle with degrees 6, 84, 90.

A right triangle with degrees 7, 83, 90.

Right Triangle degrees 7, 83, 90

A right triangle with degrees 7, 83, 90.

A right triangle with degrees 8, 82, 90.

Right Triangle degrees 8, 82, 90

A right triangle with degrees 8, 82, 90.

A right triangle with degrees 9, 81, 90.

Right Triangle degrees 9, 81, 90

A right triangle with degrees 9, 81, 90.

A right triangle with degrees 10, 80, 90.

Right Triangle degrees 10, 80, 90

A right triangle with degrees 10, 80, 90.

A right triangle with degrees 11, 79, 90.

Right Triangle degrees 11, 79, 90

A right triangle with degrees 11, 79, 90.

A right triangle with degrees 12, 78, 90.

Right Triangle degrees 12, 78, 90

A right triangle with degrees 12, 78, 90.

A right triangle with degrees 13, 77, 90.

Right Triangle degrees 13, 77, 90

A right triangle with degrees 13, 77, 90.

A right triangle with degrees 14, 76, 90.

Right Triangle degrees 14, 76, 90

A right triangle with degrees 14, 76, 90.

A right triangle with degrees 15, 75, 90.

Right Triangle degrees 15, 75, 90

A right triangle with degrees 15, 75, 90.

A right triangle with degrees 16, 74, 90.

Right Triangle degrees 16, 74, 90

A right triangle with degrees 16, 74, 90.

A right triangle with degrees 17, 73, 90.

Right Triangle degrees 17, 73, 90

A right triangle with degrees 17, 73, 90.

A right triangle with degrees 18, 72, 90.

Right Triangle degrees 18, 72, 90

A right triangle with degrees 18, 72, 90.

A right triangle with degrees 19, 71, 90.

Right Triangle degrees 19, 71, 90

A right triangle with degrees 19, 71, 90.

A right triangle with degrees 20, 70, 90.

Right Triangle degrees 20, 70, 90

A right triangle with degrees 20, 70, 90.

A right triangle with degrees 21, 69, 90.

Right Triangle degrees 21, 69, 90

A right triangle with degrees 21, 69, 90.

A right triangle with degrees 22, 68, 90.

Right Triangle degrees 22, 68, 90

A right triangle with degrees 22, 68, 90.

A right triangle with degrees 23, 67, 90.

Right Triangle degrees 23, 67, 90

A right triangle with degrees 23, 67, 90.

A right triangle with degrees 24, 66, 90.

Right Triangle degrees 24, 66, 90

A right triangle with degrees 24, 66, 90.

A right triangle with degrees 25, 65, 90.

Right Triangle degrees 25, 65, 90

A right triangle with degrees 25, 65, 90.

A right triangle with degrees 26, 64, 90.

Right Triangle degrees 26, 64, 90

A right triangle with degrees 26, 64, 90.

A right triangle with degrees 27, 63, 90.

Right Triangle degrees 27, 63, 90

A right triangle with degrees 27, 63, 90.

A right triangle with degrees 28, 62, 90.

Right Triangle degrees 28, 62, 90

A right triangle with degrees 28, 62, 90.

A right triangle with degrees 29, 61, 90.

Right Triangle degrees 29, 61, 90

A right triangle with degrees 29, 61, 90.

A right triangle with degrees 30, 60, 90.

Right Triangle degrees 30, 60, 90

A right triangle with degrees 30, 60, 90.

A right triangle with degrees 31, 59, 90.

Right Triangle degrees 31, 59, 90

A right triangle with degrees 31, 59, 90.

A right triangle with degrees 32, 58, 90.

Right Triangle degrees 32, 58, 90

A right triangle with degrees 32, 58, 90.

A right triangle with degrees 33, 57, 90.

Right Triangle degrees 33, 57, 90

A right triangle with degrees 33, 57, 90.

A right triangle with degrees 34, 56, 90.

Right Triangle degrees 34, 56, 90

A right triangle with degrees 34, 56, 90.

A right triangle with degrees 35, 55, 90.

Right Triangle degrees 35, 55, 90

A right triangle with degrees 35, 55, 90.

A right triangle with degrees 36, 54, 90.

Right Triangle degrees 36, 54, 90

A right triangle with degrees 36, 54, 90.

A right triangle with degrees 37, 53, 90.

Right Triangle degrees 37, 53, 90

A right triangle with degrees 37, 53, 90.

A right triangle with degrees 38, 52, 90.

Right Triangle degrees 38, 52, 90

A right triangle with degrees 38, 52, 90.

A right triangle with degrees 39, 51, 90.

Right Triangle degrees 39, 51, 90

A right triangle with degrees 39, 51, 90.

A right triangle with degrees 40, 50, 90.

Right Triangle degrees 40, 50, 90

A right triangle with degrees 40, 50, 90.

A right triangle with degrees 41, 49, 90.

Right Triangle degrees 41, 49, 90

A right triangle with degrees 41, 49, 90.

A right triangle with degrees 42, 48, 90.

Right Triangle degrees 42, 48, 90

A right triangle with degrees 42, 48, 90.

A right triangle with degrees 43, 47, 90.

Right Triangle degrees 43, 47, 90

A right triangle with degrees 43, 47, 90.

A right triangle with degrees 44, 46, 90.

Right Triangle degrees 44, 46, 90

A right triangle with degrees 44, 46, 90.

A right triangle with degrees 45, 45, 90.

Right Triangle degrees 45 45, 90

A right triangle with degrees 45, 45, 90.

Every elliptical involution has the property that there are two definite points in the plane from which any two conjugate points are seen under a right angle.

Circular Involution

Every elliptical involution has the property that there are two definite points in the plane from which…

To find the angle between two given lines a, b of which the projections a1, b1 and a2, b2 are given.

Angle of Two Lines

To find the angle between two given lines a, b of which the projections a1, b1 and a2, b2 are given.

To determine the angle between two planes.

Angle of Two Planes

To determine the angle between two planes.

Sir Robert S. Ball's Theory of Screws.

Theory of Screws

Sir Robert S. Ball's Theory of Screws.

The lines of contact are equal, but the axes are neither parallel to each other, or the line of contact.

Lateral Sliding Contact

The lines of contact are equal, but the axes are neither parallel to each other, or the line of contact.

An instrument for making a reduced, enlarged, or exact copy of a plane figure

Pantograph

An instrument for making a reduced, enlarged, or exact copy of a plane figure

Circles should be unshaded or shaded evenly with thick and thin lines, changing at about 45 degrees.

Drawing Lines 4

Circles should be unshaded or shaded evenly with thick and thin lines, changing at about 45 degrees.

Method to bisect an angle

Bisect An Angle

Method to bisect an angle

Method to construct an equilateral triangle

Construct Equilateral Triangle

Method to construct an equilateral triangle

Draftsman's first method for creating an ellipse

Ellipse First Method

Draftsman's first method for creating an ellipse

Draftsman's fourth method for drawing an ellipse, case 3

Ellipse Fourth Method Case 3

Draftsman's fourth method for drawing an ellipse, case 3

Draftsman's first method for drawing a parabola

Parabola First Method

Draftsman's first method for drawing a parabola