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The Azure Ordinary has a chief point in vair.

Azure Ordinary

The Azure Ordinary has a chief point in vair.

"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…

The Spiny Sea Star (Echinaster sentus) is an echinoderm in the Asteroidea class of starfish.

Spiny Sea Star

The Spiny Sea Star (Echinaster sentus) is an echinoderm in the Asteroidea class of starfish.

Echinopaedia is the name for the early or larval stages of echinoderms like sea stars and sea urchins. "A, common primitive form of Echinodermata, whence B, B', a vermiform holothurid, and C, C', a pluteiform ophiurid or echinid (pluteus) larva are derived: a, mouth; b, stomach; c, intestine; d, anus; e, ciliated band." -Whitney, 1911

Echinopaedia

Echinopaedia is the name for the early or larval stages of echinoderms like sea stars and sea urchins.…

A hydrometer is an instrument used to measure the specific gravity (or relative density) of liquids; that is, the ratio of the density of the liquid to the density of water. A hydrometer is usually made of glass and consists of a cylindrical stem and a bulb weighted with mercury or lead shot to make it float upright. The liquid to be tested is poured into a tall jar, and the hydrometer is gently lowered into the liquid until it floats freely. The point at which the surface of the liquid touches the stem of the hydrometer is noted. Hydrometers usually contain a paper scale inside the stem, so that the specific gravity can be read directly.

Common Hydrometer

A hydrometer is an instrument used to measure the specific gravity (or relative density) of liquids;…

A siphon (also spelled syphon) is a continuous tube that allows liquid to drain from a reservoir through an intermediate point that is higher, or lower, than the reservoir, the flow being driven only by the difference in hydrostatic pressure without any need for pumping. It is necessary that the final end of the tube be lower than the liquid surface in the reservoir

Siphon

A siphon (also spelled syphon) is a continuous tube that allows liquid to drain from a reservoir through…

The Myrtle (Myrtus) is a genus of one or two species of flowering plants in the family Myrtaceae, native to southern Europe and north Africa. They are evergreen shrubs or small trees, growing to 5 m tall. The leaves are entire, 3-5 cm long, with a fragrant essential oil. The star-like flowers have five petals and sepals, and numerous stamens. Petals are usually white. The fruits are globose blue-black berries containing several seeds. The flowers are pollinated by insects, and the seeds dispersed by birds that feed on the berries.

Myrtle

The Myrtle (Myrtus) is a genus of one or two species of flowering plants in the family Myrtaceae, native…

"In the apparatus shown... three forces act on a small body and are allowed to assume a position of equilibrium. A triangle is then constructed with sides parallel respectively to the three forces; it will be found by measurement that the sides are also the lengths proportional to the forces, and as will be seen the arrowheads point concurrently round the triangle.

Polygon of Forces

"In the apparatus shown... three forces act on a small body and are allowed to assume a position of…

Illustration showing that the rolling of non-cylindrical surfaces. "If the angular velocity ratio of two rolling bodies is not a constant, the pitch lines take, the conditions of pure rolling contact should be fulfilled, namely, the point of contact must be on the line of centres, and the rolling arcs must be of equal length.

Rolling of Non-cylindrical Surfaces

Illustration showing that the rolling of non-cylindrical surfaces. "If the angular velocity ratio of…

"Diagram of Vertebrate Encephalon ... in longitudinal vertical section. Mb, mid-brain; in front of it all is forebrain, behind it all is hind-brain; laminaterminalis, represented by the heavy black line in upper figure; Olf, olfactory lobes; Hmp, cerebral hemispheres; ThE, thalamencephalon; Py, pituitary body; FM, foramen of Monro; CS, corpus striatum; Th, optic thalamus; CQ, corpora quadrigemina; CC, crura cerebri; Cb, cerebellum; PV, pons Varolii; MO, medulla oblongata; I, olfactory nerves; II, optic nerves; III, point of ext from brain of the oculimotores; IV, of the pathetici; VI, of the abducentes; V-XII, origins of other cerebral nerves; 1, olfactory ventricle; 2, lateral ventricle; 3, third ventricle; 4, fourth ventricle." -Whitney, 1911

Encephalon

"Diagram of Vertebrate Encephalon ... in longitudinal vertical section. Mb, mid-brain; in front of it…

"Encrinite: head and piece of stem. Any fossil crinoid; a stone-lily: a term especially applied to the ordinary stalked form with a cylindrical stem and well-formed arms." -Whitney, 1911

Encrinite

"Encrinite: head and piece of stem. Any fossil crinoid; a stone-lily: a term especially applied to the…

"Encrinite: Any fossil crinoid; a stone-lily: a term especially applied to the ordinary stalked form with a cylindrical stem and well-formed arms. a, a, parts of the stem; b, b, separate joints." -Whitney, 1911

Encrinite

"Encrinite: Any fossil crinoid; a stone-lily: a term especially applied to the ordinary stalked form…

"In geometry, a curve generated by the motion of a point on the circumference of a circle which rolls upon the convex side of a fixed circle." -Whitney, 1911

Epicycloid

"In geometry, a curve generated by the motion of a point on the circumference of a circle which rolls…

A potentiometer instrument for measuring the potential (or voltage) in a circuit taps off a fraction of a known voltage from a resistive slide wire and compares it with the unknown voltage by means of a galvanometer. The sliding tap of the potentiometer is adjusted and the galvanometer briefly connected to both the sliding tap and the unknown potential; the deflection of the galvanometer is observed and the sliding tap adjusted until the galvanometer no longer deflects. At that point the galvanometer draws no current from the unknown source, and the magnitude of voltage can be calculated from the position of the sliding contact. This null balance method is a fundamental technique of electrical metrology.

Potentiometer

A potentiometer instrument for measuring the potential (or voltage) in a circuit taps off a fraction…

"The Metre Bridge is employed - a piece of apparatus which is illustrated [here]. It consists of a wooden base, upon the upper face of which is mounted a metallic rectangle; three sides of this rectangle are formed by a broad substantial copper band - having a negligible resistance - and the fourth consists of a platinum silver wire w w joining the copper blocks P and p. This wire is exactly one meter long, and over it slides a key K, which when depressed makes contact by means of a platinum knife-edge with the wire; the exact point on the wire at which this contact is made is indicated by an arrow-head on the key, which slides against a scale, as shown." (Britannica, 1891)

Metre Bridge

"The Metre Bridge is employed - a piece of apparatus which is illustrated [here]. It consists of a wooden…

An illustration showing the point of sight of an artist looking at a barn.

Point of Sight

An illustration showing the point of sight of an artist looking at a barn.

Illustration of the rolling of equal hyperbolas. If two equal hyperbolas are placed so that the distances between their foci O<SUB>1</SUB> and O<SUB>2</SUB>, and d and e, are each equal to fg=hk, they will make contact at some point c.

Rolling of Equal Hyperbolas

Illustration of the rolling of equal hyperbolas. If two equal hyperbolas are placed so that the distances…

Cuttlefish "bone" or internal shell. The fine point at the base structure represents the guard of the Belemnite.

Cuttlebone

Cuttlefish "bone" or internal shell. The fine point at the base structure represents the guard of the…

A common form of star-fish.

Starfish

A common form of star-fish.

A common form of brittle star, dorsal view.

Brittle Star

A common form of brittle star, dorsal view.

An extinct lily crinoid.

Lily Crinoid

An extinct lily crinoid.

"Gules, an estoile argent," or a silver star on a red background. -Whitney, 1911

Estoile

"Gules, an estoile argent," or a silver star on a red background. -Whitney, 1911

Illustration used to show how to draw a perpendicular to a straight line from a given point on the line when the point is at or near the center of the line.

Perpendicular To Straight Line Construction

Illustration used to show how to draw a perpendicular to a straight line from a given point on the line…

Illustration used to show how to draw a perpendicular to a straight line from a given point on the line when the point is near the end of the line.

Perpendicular To Straight Line Construction

Illustration used to show how to draw a perpendicular to a straight line from a given point on the line…

Illustration used to show how to draw a perpendicular to a straight line from a given point that is not on the line and which lies nearly over the center of the line.

Perpendicular To Straight Line Construction

Illustration used to show how to draw a perpendicular to a straight line from a given point that is…

Illustration used to show how to draw a perpendicular to a straight line from a given point that is not on the line and which lies nearly over one end of the line.

Perpendicular To Straight Line Construction

Illustration used to show how to draw a perpendicular to a straight line from a given point that is…

Illustration used to show how to draw a straight line parallel to a straight line through a given point.

Parallel To Straight Line Construction

Illustration used to show how to draw a straight line parallel to a straight line through a given point.

Illustration used to show how to "draw a straight line through any given point on a given straight line to make any required angle with that line."

Construction Of Angle On Straight Line

Illustration used to show how to "draw a straight line through any given point on a given straight line…

"If a straight line is perpendicular to each of two straight lines at their point of intersection it is perpendicular to the plane of those lines."

Line Perpendicular To Plane

"If a straight line is perpendicular to each of two straight lines at their point of intersection it…

"All the perpendiculars to a straight line at the same point lie in a plane perpendicular to the line."

Plane Perpendicular To Line

"All the perpendiculars to a straight line at the same point lie in a plane perpendicular to the line."

"If from the foot of a perpendicular to a plane a straight line is drawn at right angles to any line in the lane, and its intersection with that line is joined to any point of the perpendicular, this last line will be perpendicular to the line in the plane."

Perpendicular To Line In Plane

"If from the foot of a perpendicular to a plane a straight line is drawn at right angles to any line…

"Falcon-bill of about 1450. A form of martel-de-fer, distinguished by its slightly curved and sharp point." -Whitney, 1911

Falcon Bill

"Falcon-bill of about 1450. A form of martel-de-fer, distinguished by its slightly curved and sharp…

"Fan-crest, about 1350. A form of crest common in the middle ages at different periods, as in the reign of Richard I. of England, whose second great seal shows this crest, and again at the end of the thirteenth century, when it assumed the shape of a fan or screen with radiating ribs, attached to the helm at a single point." -Whitney, 1911

Medieval Helmet with Fan Crest

"Fan-crest, about 1350. A form of crest common in the middle ages at different periods, as in the reign…

Unconformity at Siccar Point, Berwick, Scotland. Folded and truncated Siluro-Ordovician beds and Old Red Sandstone beds.

Siccar Point, Berwick, Scotland

Unconformity at Siccar Point, Berwick, Scotland. Folded and truncated Siluro-Ordovician beds and Old…

"In mechanics, the point of rest about which a lever turns in lifting a body; also, a prop or support for a lever at this point. F, Fulcrum; L, lever." -Whitney, 1911

Man with Lever and Fulcrum

"In mechanics, the point of rest about which a lever turns in lifting a body; also, a prop or support…

An illustration of an man being hit by a star.

Man Being Hit by Star

An illustration of an man being hit by a star.

An illustration of a jester riding a chariot attached to a star.

Jester in Chariot

An illustration of a jester riding a chariot attached to a star.

Fort Duquesne (originally called Fort Du Quesne) was a fort established by the French in 1754, at the junction of the Allegheny and Monongahela rivers in what is now downtown Pittsburgh in the Commonwealth of Pennsylvania. It was destroyed and replaced by Fort Pitt in 1758; over two centuries later, the site formerly occupied by Fort Duquesne is now Point State Park.

Fort Duquesne

Fort Duquesne (originally called Fort Du Quesne) was a fort established by the French in 1754, at the…

The star of the Order of the Garter. "Order of the Garter, the highest order of knighthood in Great Britain, consisting of the sovereign, the Prince of Wales, and twenty-four knights companions, and open, in addition, to such English princes and foreign sovereigns as may be chosen, and sometimes to extra companions chosen for special reasons, so that the whole order usually numbers about fifty." -Whitney, 1911

Order of the Garter Star

The star of the Order of the Garter. "Order of the Garter, the highest order of knighthood in Great…

A picturesque view of the Lintz (Linz) city center. Lintz was founded by the Romans, who called it "Lentia." It was a provincial and local government city, an important trading point connecting several routes, on either side of the river Danube from the East to the West and Bohemia and Poland from north to the Balkans and Italy to the south. Linz is the third largest city of Austria and capital of the state of Upper Austria. It is located in the north centre of Austria on both sides of the river Danube.

View of Lintz

A picturesque view of the Lintz (Linz) city center. Lintz was founded by the Romans, who called it "Lentia."…

"Panurus biarmicus, the "Bearded Tit" or "Reed-Pheasant" plumage is orange-brown above, with grey crown and a black streak from the lores down the cheeks, where the feathers are elongated and point backwards; the wings are varied with black and white; the throat is greyish, the breast pinkish; the abdomen coloured like the back; the under tail-coverts are black, the bill is yellow. The hen has a buff head, while she lacks the black "moustache" and under tail-coverts." A. H. Evans, 1900

Reed Pheasant

"Panurus biarmicus, the "Bearded Tit" or "Reed-Pheasant" plumage is orange-brown above, with grey crown…

"Figure 5 shows a form of the apparatus for separating a liquid from another of different boiling point, such as alcohol and water. The mixture is poured into retort B, and then heated to about 90 degrees C, which is above the boiling point of alcohol but below that of water. The vaporized alcohol escapes through A to the worm D. This is a simple helical coil of pipe surrounded by cold water, and serving to condense the vapor, which runs out as a liquid at the bottom. The cooling water is constantly changed by the supplying fresh cold water at the bottom and drawing off the heated water from the top." Louis Derr, 1911

A Still Showing the Separation of a Liquid from a Solid

"Figure 5 shows a form of the apparatus for separating a liquid from another of different boiling point,…

"And when they were come into the house, they saw the young child with Mary his mother, and fell down, and worshipped him: and when they had opened their treasures, they presented unto him gifts; gold, and frankincense, and myrrh." Matthew 2:11 KJV

Wise Men of the East Presenting Their Gifts

"And when they were come into the house, they saw the young child with Mary his mother, and fell down,…

Diagram used to prove the theorem: "Every point in a plane which bisects a dihedral angle is equidistant from the faces of the angle"

Plane Bisecting Dihedral Angle

Diagram used to prove the theorem: "Every point in a plane which bisects a dihedral angle is equidistant…

Diagram used to prove the theorem: "The area of the surface generated by a straight line revolving about an axis in its plane is equal to the product of the projection of the line on the axis by the circumference whose radius is perpendicular erected at the middle point of the line and terminated by the axis."

Area of Surface Generated by a Straight Line

Diagram used to prove the theorem: "The area of the surface generated by a straight line revolving about…

"Third Son, the MULLET. The differences used by armorists at the present time are nine in number. They not only distinguish the sons of one family, but also denote the subordinate degrees in each house." -Hall, 1862

Mullet Difference

"Third Son, the MULLET. The differences used by armorists at the present time are nine in number. They…

Diagram of an ellipse that can used to illustrate the definition. "The constant ration between the distances of a point on an ellipse from the focus and the directrix equals the linear eccentricity divided by the semi major axis."

Definition of Ellipse

Diagram of an ellipse that can used to illustrate the definition. "The constant ration between the distances…

Diagram of an ellipse that can used to illustrate the different parts. Segment MN is the major axis, segment CD is the conjugate (minor) axis, and point O is the center of the ellipse. Both foci are also labeled in the illustration.

Parts of Ellipse

Diagram of an ellipse that can used to illustrate the different parts. Segment MN is the major axis,…

Diagram of a cone intersected by plane J to form a parabola. Also pictured is a circle formed by the intersection of plane K with the cone. "Every point of a parabola is equidistant from the focus and the directrix."

Cone Intersected by a Plane to Form a Parabola

Diagram of a cone intersected by plane J to form a parabola. Also pictured is a circle formed by the…

Diagram that illustrates "The algebraic sum of the distances of any point from the foci of a conic is greater or less than 2a, according as the point is without or within the curve."

Foci Distances on an Ellipse

Diagram that illustrates "The algebraic sum of the distances of any point from the foci of a conic is…

Diagram an ellipse with a tangent line that illustrates "A line through a point on the ellipse and bisecting the external angle between the focal radii is a tangent."

Tangent to an Ellipse

Diagram an ellipse with a tangent line that illustrates "A line through a point on the ellipse and bisecting…

Diagram part of a hyperbola with a tangent line that illustrates "A line through a point on the hyperbola and bisecting the internal angle between the focal radii is a tangent."

Tangent to a Hyperbola

Diagram part of a hyperbola with a tangent line that illustrates "A line through a point on the hyperbola…

Consonants have a closed or narrowly expanded adjustment of the vocal organs, so that in their production some part of the throat or mouth obstructs, squeezes, or divides the breath. &hellip;in representing consonants the hand suggests a narrow adjustment of the organs, by having the prominent or accented fingers straightened and the second phalanx of the thumb close to the plane of the palm. <p>Non-Vocal Consonant positions have the voice phalanx of the thumb bent at right angles to the breath phalanx, or unaccented. Primary Consonant positions have only the first finger accented. Point Consonant positions, being anterior, have the palm upright and in line with the arm.

Non-Vocal Primary Point Consonant

Consonants have a closed or narrowly expanded adjustment of the vocal organs, so that in their production…

Consonants have a closed or narrowly expanded adjustment of the vocal organs, so that in their production some part of the throat or mouth obstructs, squeezes, or divides the breath. &hellip;in representing consonants the hand suggests a narrow adjustment of the organs, by having the prominent or accented fingers straightened and the second phalanx of the thumb close to the plane of the palm. <p> Non-Vocal Consonant positions have the voice phalanx of the thumb bent at right angles to the breath phalanx, or unaccented. Mixed Consonant positions have the second, third, and fourth fingers accented. Point Consonant positions, being anterior, have the palm upright and in line with the arm.

Non-Vocal Mixed Point Consonant

Consonants have a closed or narrowly expanded adjustment of the vocal organs, so that in their production…

Consonants have a closed or narrowly expanded adjustment of the vocal organs, so that in their production some part of the throat or mouth obstructs, squeezes, or divides the breath. &hellip;in representing consonants the hand suggests a narrow adjustment of the organs, by having the prominent or accented fingers straightened and the second phalanx of the thumb close to the plane of the palm. <p> Non-Vocal Consonant positions have the voice phalanx of the thumb bent at right angles to the breath phalanx, or unaccented. Divided Consonant positions have the first and second fingers accented. Point Consonant positions, being anterior, have the palm upright and in line with the arm.

Non-Vocal Divided Point Consonant

Consonants have a closed or narrowly expanded adjustment of the vocal organs, so that in their production…

Consonants have a closed or narrowly expanded adjustment of the vocal organs, so that in their production some part of the throat or mouth obstructs, squeezes, or divides the breath. &hellip;in representing consonants the hand suggests a narrow adjustment of the organs, by having the prominent or accented fingers straightened and the second phalanx of the thumb close to the plane of the palm. <p> Non-Vocal Consonant positions have the voice phalanx of the thumb bent at right angles to the breath phalanx, or unaccented. Mixed-Divided Consonant positions have all of the fingers accented. Point Consonant positions, being anterior, have the palm upright and in line with the arm.

Non-Vocal Mixed-Divided Point Consonant

Consonants have a closed or narrowly expanded adjustment of the vocal organs, so that in their production…

Consonants have a closed or narrowly expanded adjustment of the vocal organs, so that in their production some part of the throat or mouth obstructs, squeezes, or divides the breath. &hellip;in representing consonants the hand suggests a narrow adjustment of the organs, by having the prominent or accented fingers straightened and the second phalanx of the thumb close to the plane of the palm. <p> Non-Vocal Consonant positions have the voice phalanx of the thumb bent at right angles to the breath phalanx, or unaccented. Shut Consonant positions do not have any of the fingers accented. Point Consonant positions, being anterior, have the palm upright and in line with the arm.

Non-Vocal Shut Point Consonant

Consonants have a closed or narrowly expanded adjustment of the vocal organs, so that in their production…

Consonants have a closed or narrowly expanded adjustment of the vocal organs, so that in their production some part of the throat or mouth obstructs, squeezes, or divides the breath. &hellip;in representing consonants the hand suggests a narrow adjustment of the organs, by having the prominent or accented fingers straightened and the second phalanx of the thumb close to the plane of the palm. <p> Non-Vocal Consonant positions have the voice phalanx of the thumb bent at right angles to the breath phalanx, or unaccented. Nasal Consonant positions have the breath phalanx of the thumb in the position to indicate Nasality. None of the fingers are accented. Point Consonant positions, being anterior, have the palm upright and in line with the arm.

Non-Vocal Nasal Point Consonant

Consonants have a closed or narrowly expanded adjustment of the vocal organs, so that in their production…

Consonants have a closed or narrowly expanded adjustment of the vocal organs, so that in their production some part of the throat or mouth obstructs, squeezes, or divides the breath. &hellip;in representing consonants the hand suggests a narrow adjustment of the organs, by having the prominent or accented fingers straightened and the second phalanx of the thumb close to the plane of the palm. <p> Vocalized Consonant positions have the voice phalanx of the thumb accented; that is, brought in line with the breath phalanx; this constitutes the only difference between the Vocalized and analogous Non-Vocal Consonant positions. Primary Consonant positions have only the first finger accented. Point Consonant positions, being anterior, have the palm upright and in line with the arm.

Vocalized Primary Point Consonant

Consonants have a closed or narrowly expanded adjustment of the vocal organs, so that in their production…

Consonants have a closed or narrowly expanded adjustment of the vocal organs, so that in their production some part of the throat or mouth obstructs, squeezes, or divides the breath. &hellip;in representing consonants the hand suggests a narrow adjustment of the organs, by having the prominent or accented fingers straightened and the second phalanx of the thumb close to the plane of the palm. <p> Vocalized Consonant positions have the voice phalanx of the thumb accented; that is, brought in line with the breath phalanx; this constitutes the only difference between the Vocalized and analogous Non-Vocal Consonant positions. Mixed Consonant positions have the second, third, and fourth fingers accented. Point Consonant positions, being anterior, have the palm upright and in line with the arm.

Vocalized Mixed Point Consonant

Consonants have a closed or narrowly expanded adjustment of the vocal organs, so that in their production…