### Armilla

"Armillary Sphere, an instrument used in astronomy. In its simplest form, consisting of a ring fixed…

### Egyptian Ball

"Some of the Egyptian female sports were rather of a hoydenish character, as the game of ball, in one…

### Bell in globe

A small bell inside of a glass sphere.

### Vertical Cross Section of Spherical Zones of a Casting

An illustration of a vertical cross section of the spherical zones of a casting with a diameter of 16…

### Invariable Cone

Possible forms of the invariable cone by means of the intersections with a concentric spherical surface.

### Comparative Volumes Of A Cone, Sphere, And Cylinder

Illustration used to compare the volumes of a cone, a sphere, and a cylinder.

### Comparative Surfaces Of A Cylinder And Sphere

Illustration used to compare the surfaces of a cylinder and a sphere.

### Distribution of Charge

"Distrbution of electrification on a charged hollow sphere. If an insulated conductor d be inserted…

### Earth Divisions

"The Earth, whose diameter is 7,912 miles, is represented by the globe, or sphere. The straight line…

### 2 Ellipses Inscribed In A Circle

Illustration of 2 concentric ellipses, whose major axes are vertical, inscribed in a circle whose diameter…

### Ellipses Inscribed In A Circle

Illustration of concentric ellipses, whose major axes are vertical, inscribed in a circle whose diameter…

### Ellipses Inscribed In A Circle

Illustration of concentric ellipses, whose major axes are vertical, inscribed in a circle whose diameter…

### Flashcard of a Sphere

A flashcard featuring an illustration of a Sphere

### Terrestrial Globe

"An artificial sphere on whose surface is drawn a map or representation of the earth." -Whitney, 1911

### Gyroscope

Three suspended concentric circles free to move independently of each other at right angles.

### Contours of a half sphere

"The contours of a half sphere are a series of circles, far apart near the center (top) and near together…

### Helios

"Helios the Sun-God." —Bulfinch, 1897

### Electrostatic Induction

"Bring a metallic sphere postively charged near an insulated cylindrical conductor with hemispherical…

### Micrometer

"a is the sphere, placed in half-holes on the axis bb, so that when its principal axis is parallel to…

### Micrometer

"a is the sphere, placed in half-holes on the axis bb, so that when its principal axis is parallel to…

### Convex Mirror

"A convex mirror is a part of a sphere, or globe, reflecting from the outside." -Comstock 1850

### Sphere Cut By Plane

Diagram used to prove the theorem: "Every section of a sphere by a lane is a circle."

### Sphere Tangent to Plane

Diagram used to prove the theorem: "A plane perpendicular to a radius at its extremity is tangent to…

### Spherical Polygon

Illustration of a spherical polygon.

### Spherical Polygon

Illustration of a spherical polygon.

### Spherical Pyramid

Illustration of a spherical pyramid.

### Spherical Sector

Illustration of a spherical sector.

### Sphere With Sectors and Arcs

Diagram of a sphere with sectors and arcs drawn.

### Spherical Segments

Illustration of a spherical segments.

### Sphere

A sphere is a solid bounded by a uniformly curved surface, every point of which is equally distant from…

### Sphere

"A sphere is a solid bounded by a uniformly curved surface, every point of which is equally distant…

### Development of Sphere Gore Method

An illustration in flattening the sphere using Gore method by creating cylinder sections with equal…

### Development of Sphere Zone Method

An illustration of a development of sphere using Zone method by creating sections of rolled out cones.

### Sphere With 8-inch Diameter Cut by Planes

An 8-inch sphere cut by parallel planes, one 2 inches from center and the other 6 inches from center.…

### Sphere With Arcs and Poles

A sphere with arcs and poles. "The distance of all points in the circumference of a circle of a sphere…

### Sphere With Arcs

A sphere with arcs drawn.

### Arcs Drawn on Sphere

Illustration of a sphere with arcs drawn.

### Armillary sphere

"A number of rings arranged round a centre, so as to represent a sphere; used to illustrate the relative…

### Circle Made by Plane Passing Through a Sphere

"Every section of a sphere made by a plane is a circle."

### Circumference of a Circle of a Sphere

Diagram used to prove the theorem: "All points in the circumference of a circle of a sphere are equally…

### Sphere Cut Into Pyramids.

An illustration of a sphere cut into polygons as bases with their vertices at the center of sphere.

### Sphere Inside of Cylinder.

An illustration of a sphere inside of a cylinder with radius/diameter labeled. Illustration for showing…

### Sphere Inscribed in Tetrahedron

Illustration of a sphere inscribed in a tetrahedron.

### Sphere Inscribed in Tetrahedron

Illustration of a sphere inscribed in a tetrahedron.

### Sphere with arcs and circles labeled.

An illustration of a sphere showing diameter, arcs, and circles. A sphere is a solid bounded by a curved…

### Sphere With Arcs, Circles, and Zones Labeled.

An illustration of a sphere showing diameter, arcs, and circles. A sphere is a solid bounded by a curved…

### Plane Passing Through a Sphere

Illustration of a plane passing through a sphere.

### Sphere With Tangent Plane

Illustration of a sphere with a tangent plane. "A plane perpendicular to a radius at its extremity is…

### Sphere With Tangent Plane

Illustration of a sphere with a tangent plane. "A plane perpendicular to a radius at its extremity is…

### Polyhedral Angle in a Sphere

Illustration of a sphere with a polyhedral angle whose vertex is at the center of the sphere and whose…

### Polyhedral Angle in a Sphere

Illustration of a sphere with a polyhedral angle.

### Sphere Formed By Pyramids

Illustration showing that "the solids formed by the dissected part of the sphere are pyramids."

### Sphere With Quadrants and Poles

A sphere with quadrants and poles. "A point on the surface of a sphere, which is at the distance of…

A sphere with quadrants drawn on it.

### Sphere With a Radius of 1 foot

An illustration of a sphere showing a radius of 1 foot. Illustration could be used for calculating volume.

### Wooden Sphere

A wooden hollow sphere created by using a lathe and wooden templet at a desired diameter.

### Zones or Segments of Spheres

An illustration of a zone of a sphere. A zone occurs when a sphere is cut by parallel planes that are…

### Zones or Segments of Spheres

An illustration of a zone of a sphere. A zone occurs when a sphere is cut by parallel planes that are…

### Equal Spheres With Triangles

Illustration of equal spheres with equal triangles.

### Equal Spheres With Triangles

Illustration of equal spheres with equilateral and equiangular triangles.