 ### 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… An illustration of three shafts of wheat with a circle surrounding it. ### Wheel Mechanism

Theory of static equilibrium of mechanism, illustrated b Sir A.B.W. Kennedy. ### Eight Spoke Wheel

A wheel is a circular device that is capable of rotating on its axis, facilitating movement or transportation…