### Construction Of A Cyma

An illustration showing how to construct a cyma, or two circle arcs that will tangent themselves, and…

### Series wound dynamo

"Series wound dynamo, used for series aarc lighting, and as a booster for increasing the pressure on…

### Ellipse First Method

Draftsman's first method for creating an ellipse

### Ellipse Fourth Method Case 2

Draftsman's fourth method for drawing an ellipse, case 2

### Construction Of Ellipse

Illustration used to show how to draw an ellipse by circular arcs.

### Entasis

"In architecture, the swelling or outward curve of the profile of the shaft of a column. Entasis. e…

"Extradosed Arch. a, abutments; v, voussoirs; s, springs; i, imposts; In, intrados; p, piers; k, keystone;…

### Model Of Geometric Proportions

An illustration showing a model that illustrates the following relationships: a:x = x:a - x, x = √(a²…

### Hall of Abencerrages

"Capital and Springing of Arc, from the Hall of Abencerrages, Alhambra." — The Encyclopedia Britannica,…

### Hyperbola Second Method

Draftsman's second method for drawing a hyperbola

### Irregular Curves

"Curves other than arcs of circles are drawn with the pencil or ruling pen by means of curved or irregular-shaped…

### Arc Electric Lamp

An illustration of an arc electric lamp or an arc lamp which produces light by an electric arc.

### Lancet Arch

"Lancet Arch., Horseshoe Arch."-Whitney, 1902

### Ogee Arch

"Ogee Arch., Equilateral Arch."-Whitney, 1902

### Parabola First Method

Draftsman's first method for drawing a parabola

### Pulley

Pair of circular pulleys connected b a cord, showing the range of motion as arcs

### Rectifying Arc Using Dividers

"In ordinary work the usual way of rectifying an arc is to step around it with the dividers, in spaces…

### Reflex Arc

"Diagram of the simple reflex arc. R, receptor; A, afferent (sensory) neuron; E, efferent (motor) meuron;…

### Circle with Secant

A secant is "a line which cuts a figure in any way. Specifically, in trigonometry, a line from the center…

### Sector

"In geometry: (a) A plane figure inclosed between the arc of a circle, ellipse, or other central curve…

### 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.

### Sphere With Sectors and Arcs

Diagram of a sphere with sectors and arcs drawn.

### Segmental Arch

"Segmental Arch.; Semicircular arch."-Whitney, 1902

### Skew Arch

"Skew Arch."-Whitney, 1902

### Sphere With Sectors and Arcs

Illustration of a sphere with sectors and arcs.

### Sphere With Arcs and Poles

A sphere with arcs and poles. "The distance of all points in the circumference of a circle of a sphere…

### Sphere With Arcs

A sphere with arcs drawn.

### Arcs Drawn on Sphere

Illustration of a sphere with arcs drawn.

### 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…

### Sphere With Arcs, Circles, and Zones Labeled.

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

### Sphere With a Radius of 1 foot

An illustration of a sphere showing a radius of 1 foot. Illustration could be used for calculating volume.

### Superimposed Symmetrical Spherical Triangles

Diagram showing 2 superimposed symmetrical spherical triangles.

### Symmetrical Spherical Triangles

Diagram showing 2 symmetrical spherical triangles.

### Stilted Arches

"Stilted Arches.-Modern Romanesque."-Whitney, 1902

### Construction Of A Talon

An illustration showing how to construct a talon, or two circle arcs that will tangent themselves, and…

### Tangent To A Circle

Draftsman's method to draw a tangent, AB, to a circle

### Tangent To Two Circles

Draftsman's method to draw a line tangent to two given circles

### Spherical Triangle

Diagram showing a spherical triangle.

### Spherical Triangle

Diagram showing a spherical triangle constructed by the intersection of polar arcs.

### Spherical Triangle

Diagram showing a spherical triangle constructed by the intersection of polar arcs.

### Spherical Triangle

Diagram showing a spherical triangle constructed by the intersection of polar arcs.

### Two Symmetrical Spherical Triangles

Diagram showing a 2 symmetrical spherical triangles.