 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 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… 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