2 parallel horizontal lines with arrows on both ends to show that they extend indefinitely.

Lines, 2 Parallel Horizontal

2 parallel horizontal lines with arrows on both ends to show that they extend indefinitely.

2 parallel horizontal lines with arrows on both ends to show that they extend indefinitely.  The top line is half the length of the bottom line.

Lines, 2 Parallel Horizontal

2 parallel horizontal lines with arrows on both ends to show that they extend indefinitely. The top…

2 intersecting lines, one of which is vertical and one of which is horizontal. The intersection forms a right angle.

Intersecting Lines, 2 Perpendicular

2 intersecting lines, one of which is vertical and one of which is horizontal. The intersection forms…

3 parallel horizontal lines with arrows on both ends to show that they extend indefinitely.

Lines, 3 Parallel Horizontal

3 parallel horizontal lines with arrows on both ends to show that they extend indefinitely.

4 parallel horizontal lines with arrows on both ends to show that they extend indefinitely.

Lines, 4 Parallel Horizontal

4 parallel horizontal lines with arrows on both ends to show that they extend indefinitely.

5 parallel horizontal lines with arrows on both ends to show that they extend indefinitely.

Lines, 5 Parallel Horizontal

5 parallel horizontal lines with arrows on both ends to show that they extend indefinitely.

6 parallel horizontal lines with arrows on both ends to show that they extend indefinitely.

Lines, 6 Parallel Horizontal

6 parallel horizontal lines with arrows on both ends to show that they extend indefinitely.

"When a ball is rolling on a horizontal plane, the centre of gravity is not raised, but moves in a straight line, parallel to the surface of the plane on which it rolls, and is consequently always directly over its centre of gravity." -Comstock 1850

Center of Gravity of a Rolling Ball

"When a ball is rolling on a horizontal plane, the centre of gravity is not raised, but moves in a straight…

Illustration of a shaded horizontal cylinder, viewed from the side.

Horizontal Cylinder

Illustration of a shaded horizontal cylinder, viewed from the side.

A graph of tan ellipse with Foci and Center.

Graph of Ellipse with Foci and Center Labeled

A graph of tan ellipse with Foci and Center.

A Blackland (or meadow hoe), reading "True-Temper Triumph", displayed horizontally.

Hoe

A Blackland (or meadow hoe), reading "True-Temper Triumph", displayed horizontally.

"Horizontally-coursed Arch." — Encyclopedia Britanica, 1893

Horizontal Arch

"Horizontally-coursed Arch." — Encyclopedia Britanica, 1893

"The effect of horizontal movement in shortening figure as eye travels from side to side." —Kinne, 1920

Horizontal effect

"The effect of horizontal movement in shortening figure as eye travels from side to side." —Kinne,…

A horizontal line with arrows at both ends to show that it extends indefinitely.

Line, Horizontal

A horizontal line with arrows at both ends to show that it extends indefinitely.

A horizontal line with arrows at both ends to show that it extends indefinitely.

Line, Horizontal

A horizontal line with arrows at both ends to show that it extends indefinitely.

"Horizontal Training." — Encyclopedia Britannica, 1893

Horizontal Training

"Horizontal Training." — Encyclopedia Britannica, 1893

"Forms of Horizontal Training." — Encyclopedia Britannica, 1893

Horizontal Training

"Forms of Horizontal Training." — Encyclopedia Britannica, 1893

A tool used to indicate whether a surface is level (horizontal) or plumb (vertical).

Spirit Level

A tool used to indicate whether a surface is level (horizontal) or plumb (vertical).

Projections of a line inclined to both the horizontal and vertical planes will not show its true length, as represented in this drawing.

Projections of a Line

Projections of a line inclined to both the horizontal and vertical planes will not show its true length,…

Projections of a line's true length by revolving horizontal projection.

Projections of a Line

Projections of a line's true length by revolving horizontal projection.

Right angle at perpendicular lines demonstrated by string on plumb line.

Perpendicular Lines

Right angle at perpendicular lines demonstrated by string on plumb line.

Illustration of perpendicular lines with the horizontal and vertical lines labeled. "A horizontal line is a line parallel to the horizon, or water level. A vertical line is a line perpendicular to a horizontal line; consequently, it has the direction of a plumb-line."

Perpendicular Lines With Horizontal and Vertical Labeled

Illustration of perpendicular lines with the horizontal and vertical lines labeled. "A horizontal line…

Labeled shapes showing various measures of form.

Measures of Form

Labeled shapes showing various measures of form.

Plan, front, and side views of a square pyramid after revolving pyramid through 30° with horizontal plane.

Square Pyramid Revolved 30°

Plan, front, and side views of a square pyramid after revolving pyramid through 30° with horizontal…

Roof with a slope of 30 degrees. Angle theta is the inclination to the horizontal of the line AB, drawn in the roof and making an angle of 35 degrees with the line of greatest slope.

Roof With 30 degree Inclination for Trigonometry Triangle Problems

Roof with a slope of 30 degrees. Angle theta is the inclination to the horizontal of the line AB, drawn…

A heraldic shield with a blue surface, which is represented by the horizontal lines.

Azure Shield

A heraldic shield with a blue surface, which is represented by the horizontal lines.

A heraldic shield with a black surface, which is shown by the crossing horizontal and vertical lines.

Sable Shield

A heraldic shield with a black surface, which is shown by the crossing horizontal and vertical lines.

"Shows horizontal shoring while the party walls of the remaining structure are being secured."—Finley, 1917

Horizontal shoring

"Shows horizontal shoring while the party walls of the remaining structure are being secured."—Finley,…

A horizontally trained tree

Horizontally Trained Tree

A horizontally trained tree

The fifth year of pruning a horizontally trained tree.

Pruned Tree

The fifth year of pruning a horizontally trained tree.

An unpruned vine trained according to the Hudson horizontal system.

Unpruned Vine

An unpruned vine trained according to the Hudson horizontal system.