ClipArt ETC
An illustration showing how to construct an arithmetic spiral. "Given the pitch p and angle v, divide them into an equal number of equal parts, say 6; make 01 = 01, 02 = 02, 03 = 03, 04 = 04, 05 = 05, and 06 = the pitch p; then join the points 1, 2, 3, 4, 5 and 6, which will form the spiral required."

Construction Of An Arithmetic Spiral

An illustration showing how to construct an arithmetic spiral. "Given the pitch p and angle v, divide…

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

Circle Sector

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

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

Circle Sector

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

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

Circle Sector

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

An illustration showing a triangle with interior angles A, B, C, and exterior angles D, and A' + B'.

Exterior And Interior Angles Of A Triangle

An illustration showing a triangle with interior angles A, B, C, and exterior angles D, and A' + B'.

Four types of angles: right, obtuse, acute, and straight.

Angles

Four types of angles: right, obtuse, acute, and straight.

An illustration showing a model of a circle with an exterior angle formed between a tangent and a secant that illustrates the following geometric relationship: a:t = t:b, t&sup2 = ab

Model Of Geometric Relationships In A Circle

An illustration showing a model of a circle with an exterior angle formed between a tangent and a secant…

An illustration showing a model of a circle with angles formed between tangents and secants that illustrates the following geometric relationship: t&sup2 = (a + b)(a - b).

Model Of Geometric Relationships In A Circle

An illustration showing a model of a circle with angles formed between tangents and secants that illustrates…

An illustration showing a model of 2 circles with tangent lines, diameters, and radii that illustrates the following geometric relationship: "x = aR/(R - r), a = √(t&sup2 + (R - r)&sup2), t = √(a&sup2 - (R - r)&sup2, sin.v = t/a."

Model Of Geometric Relationships In 2 Circles

An illustration showing a model of 2 circles with tangent lines, diameters, and radii that illustrates…

An illustration showing a model of 2 circles with tangent lines, diameters, and radii that illustrates the following geometric relationship: " t = √(a&sup2 - (R + r)&sup2, a = √(t&sup2 - (R + r)&sup2 "

Model Of Geometric Relationships In 2 Circles

An illustration showing a model of 2 circles with tangent lines, diameters, and radii that illustrates…

The frontal section through the right shoulder joint of a boy. Arm abducted to a right angle.

Frontal Section Through Shoulder Joint

The frontal section through the right shoulder joint of a boy. Arm abducted to a right angle.

A horizontal section through the left shoulder joint of a boy. Arm abducted to a right angle.

Horizontal Section Through Shoulder Joint

A horizontal section through the left shoulder joint of a boy. Arm abducted to a right angle.

A view of the larynx showing the vocal ligaments. Labels: 1, The anterior edge of the larynx. 4, The posterior face of the thyroid cartilage. 5, The arytenoid cartilages. 6, The vocal ligaments. 7, The origin within the angle of the thyroid cartilage. 9, 10, The glottis.

A View of the Larynx Showing the Vocal Ligaments

A view of the larynx showing the vocal ligaments. Labels: 1, The anterior edge of the larynx. 4, The…

The power possessed by the hand of a human is chiefly depended upon the size and power of the thumb, which is more developed in humans than it is in the highest apes. The thumb of the human hand can be brought into exact opposition to the extremities of all the fingers, whether singly or in combination; while in those quandrumana which most nearly approach man, the thumb is so short, and the fingers are so weak that they can never be opposed to each other with any degree of force. The human foot is, in proportion to the side of the whole body, larger, broader, and stronger than that of any other mammal.

Comparison of the Hand and the Foot of a Monkey and Human

The power possessed by the hand of a human is chiefly depended upon the size and power of the thumb,…

The elevation of the ribs is accompanied by a slight opening out of the angle which the bony part forms with its cartilage (A); and thus an additional means is provided for increasing the anteroposterior diameter of the chest.

Movement of Ribs in Inspiration

The elevation of the ribs is accompanied by a slight opening out of the angle which the bony part forms…

The modern decorative easel is a sloping frame with three or four legs. The front and rear are often connected by hinges to enable the angle of the slope to be altered. The front has a small board that can be adjusted to different heights by pins. Painters and sculptors used it, but it was often made as a decorative piece of furniture to hold pictures and portfolios.

Modern Decorative Easel

The modern decorative easel is a sloping frame with three or four legs. The front and rear are often…

Showing the changes in the thorax which follow scoliosis of the spine. The convexity of the spinal curvature is towards the right; on the side the ribs are sharply bent at their angles. On the concave (left) side their ribs have an open angle.

Changes in the Thorax following Scoliosis of the Spine

Showing the changes in the thorax which follow scoliosis of the spine. The convexity of the spinal curvature…

Showing different types of angles: right, acute, and obtuse.

Angles

Showing different types of angles: right, acute, and obtuse.

"Dip, in geology, the name given to the angle of slope of inclined rock strata, as dip in the diagram...The horizontal direction at right angles to the line of dip is called the strike, shown by st in the diagram." -Foster, 1921

Dip

"Dip, in geology, the name given to the angle of slope of inclined rock strata, as dip in the diagram...The…

"The White Ray is in the form of a rhomb, the point of the muzzle forming the lower angle, the longest ray of each pectoral forming the lateral angles, while the summit of the tail forms the last angle."

The White Ray (Raia Batis)

"The White Ray is in the form of a rhomb, the point of the muzzle forming the lower angle, the longest…

"The trunk appears to be composed of two parts, joined, and forming a more or less obtuse angle."

Trunk of the Meat-Fly

"The trunk appears to be composed of two parts, joined, and forming a more or less obtuse angle."

The side angle view of a person's head.

Head Profile

The side angle view of a person's head.

A print from the engraving, ""Fyshynge with an Angle" from 'The Book of St. Albans' printed by Wynkyn de Worde in 1496." -Cundall, 1895

Fyshynge with an Angle

A print from the engraving, ""Fyshynge with an Angle" from 'The Book of St. Albans' printed by Wynkyn…

Showing position of patella in relation to condyles of femur with knee flexed at a right angle.

Position of Patella in Relation to Condyles of Femur with Knee Flexed

Showing position of patella in relation to condyles of femur with knee flexed at a right angle.

Section of the eye, showing the relations of the cornea, sclera, and iris, together with the Ciliary muscle and the cavernous spaces near the angle of the anterior chamber.

Section of the Eye

Section of the eye, showing the relations of the cornea, sclera, and iris, together with the Ciliary…

The duodenojejunal fossa is formed where the duodenojejunal angle enters the root of the transverse mesocolon.

Duodenojejunal Fossa

The duodenojejunal fossa is formed where the duodenojejunal angle enters the root of the transverse…

Shown is norma frontalis, which refers to the front of the skull. Labels: 1, mental protuberance; 2, body of lower jaw; 3, ramus of lower jaw; 4, anterior nasal spine; 5, canine fossa; 6, infraorbital canal; 7, malar canal; 8 orbital surface of superior maxilla; 9, temporal fossa; 10, os planum of ethmoid; 11, sphenoidal fissure; 12, lachrymal bone and groove; 13, optic foramen; 14, orbital foramina; 15, temporal ridge; 16, supraorbital notch; 17, glabella; 18, frontal eminence; 19, superciliary ridge; 20, parietal bone; 21, front-nasal suture; 22, pterion; 23, great wing of sphenoid; 24, orbital surface of great wing of sphenoid; 25, squamous temporal; 26, left nasal bone; 27, malar bone; 28, sphenomaxillary fissure; 29, zygomatic arch; 30, anterior nasal aperture, displaying nasal septum and inferior and middle turbinated bones; 31, mastoid process; 32, incisor fossa; 33, angle of jaw; 34, mental foramen; 35, symphysis.

Front of the Skull

Shown is norma frontalis, which refers to the front of the skull. Labels: 1, mental protuberance; 2,…

William Sancroft (30 January 1617 – 24 November 1693), was the 79th archbishop of Canterbury. He became Dean of St. Paul's in 1664, greatly assisting with the rebuilding after the Great Fire of London, towards which he contributed £1400. In 1677, being now prolocutor of the Convocation, he was unexpectedly advanced to the archbishopric of Canterbury. He attended Charles II upon his deathbed, and "made to him a very weighty exhortation, in which he used a good degree of freedom." He crowned King James II in 1685.

Archbishop William Sancroft

William Sancroft (30 January 1617 – 24 November 1693), was the 79th archbishop of Canterbury. He became…

Having taken holy orders in 1807, he took up the family living of Hodnet in Shropshire. In 1809 he married Amelia Shipley, daughter of the Dean of St Asaph. He was made prebendary of St Asaph in 1812, appointed Bampton lecturer for 1815, preacher at Lincoln's Inn in 1822, and Bishop of Calcutta in January 1823. Before sailing for India he received the degree of D.D. from the University of Oxford. In India, Bishop Heber laboured indefatigably - not only for the good of his own diocese, but for the spread of Christianity throughout the East. He toured the country, consecrating churches, founding schools and discharging other Christian duties. Heber was a pious man of profound learning, literary taste and great practical energy. His fame rests mainly on his hymns.

Bishop Reginald Heber

Having taken holy orders in 1807, he took up the family living of Hodnet in Shropshire. In 1809 he married…

A contour about to cross a stream runs up one side and down the other, making a V where it crosses, the angle of the V pointing up stream. Contour lines representing spurs between stream lines are generally U shaped with the bottom or rounded part of the U pointing down hill.

Contour Lines

A contour about to cross a stream runs up one side and down the other, making a V where it crosses,…

Some knives have the handle placed at a right angle with the blade. The farmer in cutting hay from the haymow in his bard uses a large knife with such a right angle handle and calls it a hay-knife.

Hay Knife

Some knives have the handle placed at a right angle with the blade. The farmer in cutting hay from the…

One very useful knife has a long blade with a cutting edge on one side, and a handle at each end, placed a a right angle with the blade. Such a two-handled knife is called a draw knife, because it is used with both hands and is pulled or drawn forward in making a cut with a blade.

Draw Knife (Colonial Tool)

One very useful knife has a long blade with a cutting edge on one side, and a handle at each end, placed…

With the plane, one can make rough wood true, smooth and beautiful. The name plane, perhaps, comes from the work it does, for it is used to smooth or reduce wood to a true plane.

Core Box Plane

With the plane, one can make rough wood true, smooth and beautiful. The name plane, perhaps, comes from…

Inferior maxilla of a horse-anterolateral view. Labels: a, body; b, b', rami; c, neck; d, mental foramen; e, buccinator; e', masseter surface; f, f', inner surface of ramus; g, molor alveoli; g', anterior border; g', bar, bounding diastema; h, h', h', posterior border. The angle lies between h' and h'; i, condyles; km coronoid processes; l, maxillary space; m, inferior dental foramen; n, sigmoid notch.

Inferior Maxilla of a Horse

Inferior maxilla of a horse-anterolateral view. Labels: a, body; b, b', rami; c, neck; d, mental foramen;…

Right cardiac bone of an ox. Labels: a, anterior angle; b, posterior angles; c, superior border; d, anterior border; e, posterior border; f, right surface.

Cardiac Bone of an Ox

Right cardiac bone of an ox. Labels: a, anterior angle; b, posterior angles; c, superior border; d,…

The Zöllner illusion is a classic optical illusion named after its discoverer, German astrophysicist Johann Karl Friedrich Zöllner. In this figure the black lines seem to be unparallel, but in reality they are parallel. The shorter lines are on an angle to the longer lines. This angle helps to create the impression that one end of the longer lines is nearer to us than the other end. This is very similar to the way the Wundt illusion appears. It may be that the Zöllner illusion is caused by this impression of depth.

Zollner Illusion

The Zöllner illusion is a classic optical illusion named after its discoverer, German astrophysicist…

The angle between the Union II and VI Corps became known as the "Bloody Angle of Spotsylvania", where perhaps some of the most savage fighting of the whole Civil War took place.

Bloody Angle of Spotsylvania

The angle between the Union II and VI Corps became known as the "Bloody Angle of Spotsylvania", where…

The chief advantages of the horizontal sundial are that it is easy to read, and the sun lights the face throughout the year. All the hour-lines intersect at the point where the gnomon's style crosses the horizontal plane. Since the style is aligned with the Earth's rotational axis, the style points true North and its angle with the horizontal equals the sundial's geographical latitude λ. A sundial designed for one latitude can be used in another latitude, provided that the sundial is tilted upwards or downwards by an angle equal to the difference in latitude. For example, a sundial designed for a latitude of 40° can be used at a latitude of 45°, if the sundial plane is tilted upwards by 5°, thus aligning the style with the Earth's rotational axis.

Horizontal Dial

The chief advantages of the horizontal sundial are that it is easy to read, and the sun lights the face…

A sundial is a device that measures time by the position of the Sun. In common designs such as the horizontal sundial, the sun casts a shadow from its style (a thin rod or a sharp, straight edge) onto a flat surface marked with lines indicating the hours of the day. As the sun moves across the sky, the shadow-edge progressively aligns with different hour-lines on the plate. Such designs rely on the style being aligned with the axis of the Earth's rotation. Hence, if such a sundial is to tell the correct time, the style must point towards true North (not the north or south magnetic pole) and the style's angle with horizontal must equal the sundial's geographical latitude.

Sundial

A sundial is a device that measures time by the position of the Sun. In common designs such as the horizontal…

The sharp or sharpie is a long, narrow sailboat with a flat bottom used for oystering.

Sharpie

The sharp or sharpie is a long, narrow sailboat with a flat bottom used for oystering.

A gravity escapement uses a small weight or a weak spring to give an impulse directly to the pendulum. The earliest form consisted of two arms which were pivoted very close to the suspension spring of the pendulum with one arm on each side of the pendulum. Each arm carried a small dead beat pallet with an angled plane leading to it. When the pendulum lifted one arm far enough its pallet would release the escape wheel. Almost immediately another tooth on the escape wheel would start to slide up the angle face on the other arm thereby lifting the arm. It would reach the pallet and stop. The other arm meanwhile was still in contact with pendulum and coming down again to a point lower than it had started from. This lowering of the arm provides the impulse to the pendulum. The design was developed steadily from the middle of the 18th century to the middle of the 19th century. It eventually became the escapement of choice for turret clocks.

Mudge's Gravity Escapement

A gravity escapement uses a small weight or a weak spring to give an impulse directly to the pendulum.…

A gravity escapement uses a small weight or a weak spring to give an impulse directly to the pendulum. The earliest form consisted of two arms which were pivoted very close to the suspension spring of the pendulum with one arm on each side of the pendulum. Each arm carried a small dead beat pallet with an angled plane leading to it. When the pendulum lifted one arm far enough its pallet would release the escape wheel. Almost immediately another tooth on the escape wheel would start to slide up the angle face on the other arm thereby lifting the arm. It would reach the pallet and stop. The other arm meanwhile was still in contact with pendulum and coming down again to a point lower than it had started from. This lowering of the arm provides the impulse to the pendulum. The design was developed steadily from the middle of the 18th century to the middle of the 19th century. It eventually became the escapement of choice for turret clocks.

Bloxam's Gravity Escapement

A gravity escapement uses a small weight or a weak spring to give an impulse directly to the pendulum.…

An illustration of an "elastic spiral wing, which twists and untwists during its action, to for a mobile helix or screw. This wing is made to vibrate by a direct piston action, and b a slight adjustment can be propelled vertically, horizontally or at any degree of obliquity." -Britannica, 1910

Elastic Spiral Wing

An illustration of an "elastic spiral wing, which twists and untwists during its action, to for a mobile…

An illustration of a elastic aerial screw with twisted blades. "X, End of driving shaft; v,w, Sockets in which the roots of the blades of the screw rotate, the degree of rotation being limited by steel springs (z, s); ab, ef, Tapering elastic rods forming anterior or thick margins of blades of screw; d c, h g, Posterior or thin elastic margins of blades of screw. The arrows m, n, o, p, q, r, indicate the direction of travel." -Britannica, 1910

Elastic Aerial Screw with Twisted Blades Resembling Wings

An illustration of a elastic aerial screw with twisted blades. "X, End of driving shaft; v,w, Sockets…

"Track-layers' tongs for lifting rails. They have short jaws designed to clasp the rail head and two long handles bent at a right angle." -Whitney, 1911

Rail Tongs

"Track-layers' tongs for lifting rails. They have short jaws designed to clasp the rail head and two…

The good effect of the Ionic capital is really only produced by the front-view. It seems calculated to be introduced between pillars and antæ, and not in a disconnected peristyle with with angle columns. In angle columns, however, the volutes are sometimes constructed in such a way that they meet at both sides diagonally.

Ionic Angle Column from the Temple of Minerva Polias at Athens, Front

The good effect of the Ionic capital is really only produced by the front-view. It seems calculated…

The good effect of the Ionic capital is really only produced by the front-view. It seems calculated to be introduced between pillars and antæ, and not in a disconnected peristyle with with angle columns. In angle columns, however, the volutes are sometimes constructed in such a way that they meet at both sides diagonally.

Ionic Angle Column from the Temple of Minerva Polias at Athens, Side

The good effect of the Ionic capital is really only produced by the front-view. It seems calculated…

The angle ornament symbol is a symbol of art.

Angle Ornament Symbol

The angle ornament symbol is a symbol of art.

The angle border interlacement band is a Modern French design.

Angle Border Interlacement Band

The angle border interlacement band is a Modern French design.

The angle border interlacement band is a Modern French design.

Angle Border Interlacement Band

The angle border interlacement band is a Modern French design.

The angle border interlacement band is a Modern French design.

Angle Border Interlacement Band

The angle border interlacement band is a Modern French design.

The angle border interlacement band is a Modern French design.

Angle Border Interlacement Band

The angle border interlacement band is a Modern French design.

The angle border interlacement band is a Modern French design.

Angle Border Interlacement Band

The angle border interlacement band is a Modern French design.

The angle border interlacement band is a Modern French design.

Angle Border Interlacement Band

The angle border interlacement band is a Modern French design.

The evolute spiral angle is a wave pattern that mimics the wave of the sea.

Evolute Spiral Angles

The evolute spiral angle is a wave pattern that mimics the wave of the sea.

The evolute spiral angle is a wave pattern that mimics the wave of the sea.

Evolute Spiral Angles

The evolute spiral angle is a wave pattern that mimics the wave of the sea.

A howitzer is a type of artillery piece that is characterized by a relatively short barrel and the use of comparatively small explosive charges to propel projectiles at trajectories with a steep angle of descent. In the taxonomies of artillery pieces used by European (and European-style) armies in the 18th, 19th, and 20th centuries, the howitzer stood between the "gun" (which was characterized by a longer barrel, larger propelling charges, smaller shells, higher velocities and flatter trajectories) and the "mortar" (which has the ability to fire projectiles at even higher angles of ascent and descent).

Howitzer

A howitzer is a type of artillery piece that is characterized by a relatively short barrel and the use…

"In geometry, an angle connected with an ellipse and defined as ... angle BCL, reckoned from one determinate end, B, of the transverse axis, called the eccentric angle of the point H." -Whitney, 1911

Eccentric Angle

"In geometry, an angle connected with an ellipse and defined as ... angle BCL, reckoned from one determinate…

"An instrument for observing or detecting the existence of free electricity, and, in general, for determining its kind. ... Quadrant electroscope, a form of pith-ball electroscope which serves to measure roughly the degree of electrification by the rise of the pith-ball as indicated by the motion of the rod carrying it on a graduated semicircle." -Whitney, 1911

Quadrant Electroscope

"An instrument for observing or detecting the existence of free electricity, and, in general, for determining…

"A globe casts its shadow upon the ground; the sun's rays parallel with the picture at an angle of 45° with the horizon." (Britannica, 1891)

Shadows of Curvilinear Objects

"A globe casts its shadow upon the ground; the sun's rays parallel with the picture at an angle of 45°…