 ### Golden Angle

Illustration showing the golden angle. The golden angle is the smaller of two angles created by dividing… ### Arc lamp

"In all the arc lamps in common use, the coil, by means of which the automatic maintenance of the arc… ### Arc Lamp

"The arc lamp is essentially a device for automatically separating the carbons when the current is turned… ### Carbon Flame Arc Lamp

"Diagram of inclined carbon-flame arc lamp." —Croft 1917 ### Detailed Arc Lamp

"Illustration showing the detail of a carbon arc lamp; S, solenoid; c, clutch; w, clutch-washer; T,… ### Differential Arc Lamp

"Differential arc lamp mechanism." —Croft 1917 ### Metallic Flame Arc Lamp

"Metallic flame arc lamp." —Croft 1917 ### Arc Lamps In Series

"Since arc lamps are connected in series, any particular lamp that is to be extinguished must be short-circuited.… ### Circuits of Arc Lamp

"Circuits of a series arc lamp." —Croft 1917 ### Arc Lamp Series Regulating Coil

"Arc lamp mechanism with series regulating coil." —Croft 1917 ### Arc Lamp with Shunt Regulating Coil

"Arc lamp mechanism with shunt regulating coil." —Croft 1917 ### Carbon Arc Lighting

Arc lighting, which used two carbon rods conducting electricity to produce light. -Atkinson 1903 ### Bisecting an Arc

Illustration used to show how to bisect a given arc. ### Positive and Negative Arcs in Circles

Illustration showing arcs measured in positive and negative angles. ### Bisect A Line

Method to draw the bisector of a line ### Bisect An Angle

Method to bisect an angle ### Construction Of Center

Illustration used to show how to find the center when given an arc and its radius. ### Construction Of A Circle Arc

An illustration showing how to construct a circle arc without recourse to its center, but its chord… ### Arc of Circle

Illustration of a circle with the arc aeb drawn and labeled. ### Arc of Circle

An illustration of an arc of a circle. An arc is any part of the circumference of a circle. ### Circle with Arc, Chord, Inscribed Angle, Circumscribed Polygon

Illustrations of a circle with arc, chord, inscribed angle, and circumscribed about a polygon. ### Arc and Chord in Circle

Illustration of circle with arc and chord. ### Arcs Inscribed In A Circle

A design created by inscribing 4 congruent tangent arcs in a circle. ### Central Angles and Arcs in a Circle

Illustration of a circle that can be used to show that an "angle at the center of a circle is measured… ### Central Angles and Arcs in a Circle

Illustration of a circle that can be used to show that an "angle at the center of a circle is measured… ### Central Angles and Arcs in a Circle

Illustration of a circle that can be used to show that an "angle at the center of a circle is measured… ### Diameter Perpendicular to a Chord in a Circle

Illustration used to show that "The diameter perpendicular to a chord bisects the chord and also its… ### Circle With Parts

Circle with diameter, radius, arc, chord, and arc. ### Parts of Circle

Illustration of circle with arc, chord, diameter and radius. ### Quadrant of Circle With 60 degree Arc

Illustration of circle with quadrant and 60 degree arc. ### Radius, Diameter, and Chord In A Circle

An illustration showing a circle with radius r, diameter d, and chord c. ### Reflected Arcs Of A Circle

A design created by dividing a circle into 4 equal arcs and reflecting each arc toward the center of… ### Sector Of Circle

Illustration of a sector of a circle. A sector is the space between an arc and two radii drawn to the… ### Sector Of A Hollow Circle

Illustration of a sector of a hollow circle. A sector is the space between an arc and two radii drawn… ### Circle With Two Intersecting Chords

Illustration of a circle with two intersecting chords within the circumference. The angle formed is… ### Equal Chords in Equal Circles Theorem

Illustration used to show that "In equal circles, or in the same circle, if two chords are equal, they… ### Equal Chords in Equal Circles Theorem

Illustration used to show that "In equal circles, or in the same circle, if two chords are equal, they… ### Unequal Chords in Circles Theorem

Illustration used to show that "In equal circles, or in the same circle, if two chords are unequal,… ### Unequal Chords in Equal Circles Theorem

Illustration used to show that "In equal circles, or in the same circle, if two chords are unequal,… ### Unequal Chords in Equal Circles Theorem

Illustration used to show that "In equal circles, or in the same circle, if two chords are unequal,… ### Equal Circles With Intercepted Arcs

Illustration of equal circles to show that two central angles have the same ratio as their intercepted… ### Circles With Inscribed Angles

Illustration of equal circles to show that an inscribed angle is measured by half the arc intercepted… ### Intersecting Lines in Circles

Illustration showing various circles and the angles formed by intersecting lines. ### Circles With Parallels Intercepting Equal Arcs

Illustration of a circle with parallels intercepting equal arcs on a circumference. ### Reflected Arcs Of 2 Circles In A Circle

A design created by dividing a circle into 4 equal arcs and creating a reflection of each arc toward… ### Reflected Arcs Of 2 Circles

A design created by dividing a circle into 4 equal arcs and reflecting each arc toward the center of… ### Reflected Arcs Of 2 Circles

A design created by dividing a circle into 4 equal arcs and reflecting each arc toward the center of… ### Reflected Arcs Of 4 Circles In A Circle

A design created by dividing a circle into 4 equal arcs and creating a reflection of each arc toward… ### Reflected Arcs Of 4 Circles In A Circle

A design created by dividing a circle into 4 equal arcs and creating a reflection of each arc toward… ### Reflected Arcs Of 8 Circles In A Circle

A design created by dividing a circle into 4 equal arcs and creating a reflection of each arc toward… ### Reflected Arcs Of 8 Circles

A design created by dividing a circle into 4 equal arcs and creating a reflection of each arc toward… ### Draw Circular Arc Through Three Given Points

"Join AB and BC, bisect AB and BC by perpendiculars. Their intersection will be the center of the required… ### Condensing Apparatus

"Condensing Apparatus for Steamer's Side Lights.—By means of this application of the condensing… ### Condensing Apparatus

"Condensing Apparatus for Steamer's Side Lights.—By means of this application of the condensing principle… ### Parallel Connection

"When all of the positive plates are connected on one side, and all of the negative plates are connected… ### Construct Equilateral Triangle

Method to construct an equilateral triangle ### Construct Isosceles Triangle

Method to construct an isosceles triangle ### Construction of Arc When Given the Chord and Height of the Segment

Illustration of of construction of an arc when the chord and height of the segment are given. ### Construction of Bisecting a Given Arc

Illustration of the construction used to bisect a given arc. ### Cycloidal Arch

"Cycloidal Arch. Elliptical Arch."-Whitney, 1902