### Intersecting Spheres

Illustration of two intersecting spheres. "The intersection of two spherical surfaces is the circumference…

### Measure of a Spherical Angle

Diagram used to prove the theorem: "A spherical angle is measured by the arc of a great circle described…

### Flanged Spherical Segment

An illustration of a flanged spherical segment with a diameter of 10 inches. Illustration could be used…

### Volume of Spherical Segment

Diagram used to prove the theorem: "The volume of a spherical segment is equal to the sum of two cylinders…

### Side Comparison of Spherical Triangle

Diagram used to prove the theorem: "In a spherical triangle, the greater side is opposite the greater…

### Superimposed Symmetrical Spherical Triangles

Diagram showing 2 superimposed symmetrical spherical triangles.

### Symmetrical Spherical Triangles

Diagram showing 2 symmetrical spherical triangles.

### Spherometer

"An instrument for measuring the radii of spheres; a sphere-measurer. It is of especial service to opticians…

### Isosceles Spherical Triangle

Illustration of an isosceles spherical triangle.

### Isosceles Spherical Triangle

Illustration of an isosceles spherical triangle.

### Spherical Triangle

Diagram showing a spherical triangle.

### Spherical Triangle

Diagram showing a spherical triangle constructed by the intersection of polar arcs.

### Spherical Triangle

Diagram showing a spherical triangle constructed by the intersection of polar arcs.

### Spherical Triangle

Diagram showing a spherical triangle constructed by the intersection of polar arcs.

### Polar and Spherical Triangles

Illustration of polar and spherical triangles.

### Polar Triangles in Sphere

Illustration of polar triangles.

### Symmetric Spherical Triangles

Illustration of symmetrical spherical triangles.

### Symmetric Spherical Triangles

Illustration of symmetrical spherical triangles.

### Symmetric Spherical Triangles

Illustration of symmetrical spherical triangles.

### Two Symmetrical Spherical Triangles

Diagram showing a 2 symmetrical spherical triangles.