### Argent Shield

A heraldic shield made of argent (silver), which is represented by its plain, smooth surface.

### Boit's Experiment

"Boit's experiment which proved tat the charge resides on the surface." -Hawkins, 1917

### Circle With Center o and Radius r with point P

Circle modeling the earth. O is the center of the earth, r the radius of the earth, and h the height…

### Curve in Pavement of Road

Illustration of blueprint used by highway engineers to widen the pavement on the inside of the curve…

### 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…

### Inclined Plane with the Force Acting Parallel to the Base

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

### 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…

### Gules Shield

A heraldic shield with a red (gules) surface, which is represented by the perpendicular lines, drawn…

### Illumination of a Surface When the Surface is not Perpendicular to the Source

Illustration modeling the illumination on a surface when the surface is not perpendicular to hte rays…

### Inclined Plane

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

### Tool Level

A device used for determining or adjusting something to a horizontal surface.

### Surface of the palm

"Surface of Palm of the Hand, showing Openings of Sweat Glands and Grooves between Papillae of the Skin.…

### Rays

"Summer and Winter rays.—Let us suppose that the rays falling perpendicularly on a given extent…

### Reflection of Light from a Broken Surface

"Reflection of light from a broken surface." —Croft 1917

### Irregular Reflection or Diffusion

"Irregular reflection or diffusion results from the incidence of radiant energy upon an irregular surface,…

### Reflection of Light from a Smooth Surface

"Reflection of light from a smooth surface." —Croft 1917

### Reflection of Light from a Smooth Surface

"Reflection of light form a smooth surface." —Croft 1917

### Separator and Sifter

Separates wanted elements from unwanted material using a filter such as a mesh or net. However, in cooking,…

### Comparison Of Units Of Square Measure

Illustration comparing the fundamental units of measure 1 square yard and 1 square meter.

### Surface Tension and Needle

"Carefully place a fine sewing needle upon the surface of the water. With care, and perhaps repitition,…

### Curved Surface

Illustration of silo to show a curved surface

### Adjustable Window Screen

A movable device, especially a framed construction such as a room divider or a decorative panel, designed…

### Rustic Work Depictions

In masonry, is a term applied where surface of a wall shows groves between the different courses of…

### Pipe Wrench

A wrench used for turning soft iron pipes and fittings with a rounded surface.