### Break Lathe

"Break lathes can take in work of considerable length as well as of large diameter,—the treble-geared…

### Calipers

"A kind of compass for measuring the diameter of round bodies." — Williams, 1889

### Circle with Diameter

Illustration of circle with diameter.

### Circle Diameters

If every diameter is perpendicular to its conjugate, the conic is a circle.

### Circle Parts

A circle with labels for radius, diameter, and circumference. The visual will help to remember what…

### Inscribed Angle in a Circle Proof

Illustration of a circle with an inscribed angle that can be used to prove that "An inscribed angle…

### Circle to Circle Tangents

Equal circles inside and tangent to the outside circle, also tangent to each other

### Circle With 10 inch Diameter and Steel Square

Illustration of circle with 10 inch diameter and square.

### Circle With 6 inch Diameter

Illustration of circle with 6 inch diameter.

### Circle With 8 inch Diameter

Illustration of circle with 8 inch diameter.

### Area Of A Circle

An illustration used to show how the area of a circle is calculated. Area is equal to the product of…

### Chords, Diameters, and Radii of a Circle

Illustration of a circle with diameter AB. Radii are RO, SO, AO, and BO. ED is a chord.

### Chords, Secants, Diameters, and Tangents of a Circle

Illustration of a circle with diameter BC, chord DF, secant MN, and tangent HK.

### Circle With Diameter, Radius, Segment

Illustration showing a circle with a diameter, radius, and segment drawn.

### Circle With Diameter, Radius, Segment, Line

Illustration showing a circle with a diameter, radius, lines, triangle, and segment drawn.

### Diameters of a Circle

Illustration of a circle with two intersecting diameters.

### Circle With Parts

Circle with diameter, radius, arc, chord, and arc.

### Parts of Circle

Illustration of circle with arc, chord, diameter and radius.

### Circle With Perpendicular Diameters

Illustration of circle with perpendicular diameters.

### Circle With Perpendicular Diameters

Illustration of circle with perpendicular diameters.

### Circle With a Perpendicular Drawn to the Diameter

"If from any point on the circumference of a circle, a perpendicular be let fall upon a given diameter,…

### Circles With Radius 4000 and Enclosed Triangle

Illustration of circle with radius of 4000, and triangle with 45 degree angle enclosed.

### Radius, Diameter, and Chord In A Circle

An illustration showing a circle with radius r, diameter d, and chord c.

### Regular Hexagon Inscribed In A Circle

Illustration of a regular hexagon inscribed in a circle. This can also be described as a circle circumscribed…

### Circle With Diameter and Segment labeled

Illustration of circle with diameter and segment used to find area.

### Square Circumscribed About A Circle

Illustration of a square, with diagonals drawn, circumscribed about a circle. This can also be described…

### Square Circumscribed About A Circle

Illustration of a square, with 1 diagonals drawn, circumscribed about a circle. This can also be described…

### Square Circumscribed About A Circle

Illustration of a square circumscribed about a circle. This can also be described as a circle inscribed…

### Square Inscribed In A Circle

Illustration of a square inscribed in a circle. This can also be described as a circle circumscribed…

### Square Inscribed In A Circle

Illustration of a square, with diagonals drawn, inscribed in a circle. This can also be described as…

### Circle With Various Chords

Illustration showing a circle with various chords drawn.

### Circle With Various Chords

Illustration showing a circle with various chords drawn.

### Circle With Various Chords And Tangents

Illustration showing a circle with various chords and tangents drawn.

### Circle With Various Chords And Tangents

Illustration showing a circle with various chords and tangents drawn.

### Circles Enclosed in Equilateral Triangle

Illustration of three circles enclosed in an equilateral triangle.

### Circles Inside of a Square

Illustration of large circle and square with 4 smaller circles inside.

### Circular Pipes in Box

Illustration of box filled with pipes.

### Earth Divisions

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

### Conjugate Diameters of an Ellipse

Illustration showing that if one diameter is conjugate to a second, the second is conjugate to the first.

### Epicycloidal Wheel

"Epicycloidal wheel, a wheel or ring fixed to a framework, toothed on its inner side, and having in…

### Gyroscope

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

### Hyperbola Conjugate Diameters

Any two conjugate diameters of an hyperbola are harmonic conjugates with regard to the asymptotes.

### Increased Velocity

"The principle of increased velocity as bodies descend from a height, is curiously illustrated by pouring…

### Kauri Pine

The Kauri Pine (Agathis australis) is a coniferous tree peculiar to New Zealand, and forming its most…

### Magic Circle of Circles

The magic circle of circles, first developed by Benjamin Franklin, consists of eight annular rings and…

### Circle With 2 Perpendicular Diameters

Illustration of a circle with center O and diameters AB and CD perpendicular to each other.

### Ring Made of Circles With Diameters 3a-7 and 6a+9

An illustration of a ring (circle within circle), with diameters of 3a-7 and 6a+9. Illustration could…

### Ring Made of Concentric Circles

Illustration of ring (small circle in larger concentric circle).

### Ring With Piece Cut Out

Illustration of ring (small circle in larger concentric circle) with piece cut out.

### Ring Sprung Into Place

Illustration of ring (small circle in larger concentric circle) sprung into place.

### Circle Sector

An illustration showing a circle sector with radius r, center/central angle v, and length of circle…

### Circle Sector

An illustration showing a circle sector with center/central angle v and polygon angle w.

### Circle Sector

An illustration showing a circle sector with height of segment h and radius r.

### Semicircle

Semicircle with line drawn perpendicular to the diameter.

### Semicircle

Illustration of a semicircle.

### Semicircle With Chords and Radii

Illustration of a semicircle with chords and radii.

### 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 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 with arcs and circles labeled.

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