### Construction Used to Inscribe a Circle in a Triangle

Illustration used to inscribe a circle in a given triangle.

### Right Triangle Inscribed in Semicircle Shows Mean Proportional

Right triangle inscribed in semicircle. Illustration shows that the perpendicular from any point in…

### Isosceles Spherical Triangle

Illustration of an isosceles spherical triangle.

### Isosceles Spherical Triangle

Illustration of an isosceles spherical triangle.

### Circle Made Up Of Triangles

"A circle may be considered as made up of triangles whose bases form the circumference, and whose altitude…

### 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.

### Construction Of Two Circles That Tangent Themselves and 2 Given Lines

An illustration showing how to construct two circles that tangent themselves and two given lines. "Draw…

### Uniting Wire above the Needle

"The instant this is done and the galvanic circle completed, the needle will deviate from its north…