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The typical representation of bluffs (other than rocky) on a topographical map.

Bluffs, Other than Rocky

The typical representation of bluffs (other than rocky) on a topographical map.

The typical representation of rocky bluffs on a topographical map.

Rocky Bluffs

The typical representation of rocky bluffs on a topographical map.

A homemade clinometer, an instrument used for measuring angles of slope.

Clinometer

A homemade clinometer, an instrument used for measuring angles of slope.

In cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. A contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness of slopes. The contour interval of a contour map is the difference in elevation between successive contour lines.

Contour System

In cartography, a contour line (often just called a "contour") joins points of equal elevation (height)…

The typical representation of depression contours, if otherwise ambiguous, on a topographical map.

Depression Contours

The typical representation of depression contours, if otherwise ambiguous, on a topographical map.

"An inclined plane is a slope, or a flat surface, making an angle with a horizontal line...the force acts at an angle to the plane or to the base." —Hallock 1905

Inclined Plane with Force at an Angle to Plane and Base

"An inclined plane is a slope, or a flat surface, making an angle with a horizontal line...the force…

"An inclined plane is a slope, or flat surface, making an angle with a horizontal line...the force acts parallel to the plane." —Hallock 1905

Inclined Plane with the Force Acting Parallel to the Plane

"An inclined plane is a slope, or flat surface, making an angle with a horizontal line...the force acts…

In cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. A contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness of slopes. The contour interval of a contour map is the difference in elevation between successive contour lines.

Glacier Contours

In cartography, a contour line (often just called a "contour") joins points of equal elevation (height)…

In cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. A contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness of slopes. The contour interval of a contour map is the difference in elevation between successive contour lines.

Glacier Form Lines

In cartography, a contour line (often just called a "contour") joins points of equal elevation (height)…

The Hill sign should be used in advance of a downgrade where the length, percent of grade, horizontal curvature, and/or other physical features require special precautions on the part of road users.

Hill, Black and White

The Hill sign should be used in advance of a downgrade where the length, percent of grade, horizontal…

The Hill sign should be used in advance of a downgrade where the length, percent of grade, horizontal curvature, and/or other physical features require special precautions on the part of road users.

Hill, Color

The Hill sign should be used in advance of a downgrade where the length, percent of grade, horizontal…

The Hill sign should be used in advance of a downgrade where the length, percent of grade, horizontal curvature, and/or other physical features require special precautions on the part of road users.

Hill, Outline

The Hill sign should be used in advance of a downgrade where the length, percent of grade, horizontal…

The Hill sign should be used in advance of a downgrade where the length, percent of grade, horizontal curvature, and/or other physical features require special precautions on the part of road users.

Hill, Silhouette

The Hill sign should be used in advance of a downgrade where the length, percent of grade, horizontal…

"One of the primary simple mechanical powers. The plane's surface is inclined to the horizon at any angle." —Quackenbos 1859

Inclined Plane

"One of the primary simple mechanical powers. The plane's surface is inclined to the horizon at any…

One way to spread water over a hillside field, "f m is the main ditch and the slope of the hill as shown by the arrows; t o, r p, and s q are small ditches or plow furrows cut on a level line around the face of the hill. The water is let into the field by the short ditch at i, and is then spread over the space b c t o by means of a marginal ditch y z, from which it is made to flow in small streams and in a regular manner over the space between it and the lower ditch t o." -Department of Agriculture

Irrigation by Furrows

One way to spread water over a hillside field, "f m is the main ditch and the slope of the hill as shown…

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…

The typical representation of sand dunes on a topographical map.

Sand Dunes

The typical representation of sand dunes on a topographical map.

This illustration shows a rock formation that has a tilted strata. d p is the direction of the dip. Both the angle of slope and the direction are noted by the geologist: thus, it may be said of beds, the dip is 50 degrees to the south, or 45 degrees to the northwest, etc.

Tilted Strata

This illustration shows a rock formation that has a tilted strata. d p is the direction of the dip.…

This illustration shows a rock formation that has a tilted strata. a b c d represents a square block of wood, having a graduated arc b c and a plummet hung below a. Placed on the sloping surface A B, the position of the plummet gives the angle of dip.

Tilted Strata

This illustration shows a rock formation that has a tilted strata. a b c d represents a square block…

Trajectory is the path a moving object follows through space. A trajectory can be described mathematically either by the geometry of the path, or as the position of the object over time.

Trajectory

Trajectory is the path a moving object follows through space. A trajectory can be described mathematically…

If land falls to a minimum line with a steady slope, the land form created is called a valley.

Valley

If land falls to a minimum line with a steady slope, the land form created is called a valley.

"This wedge is a movable inclined plane. Allows for raising great weights a short distance." —Quackenbos 1859

Inclined Plane Wedge

"This wedge is a movable inclined plane. Allows for raising great weights a short distance." —Quackenbos…