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Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the roadway by trucks, bicyclists, farm vehicles, emergency vehicles, golf carts, horse-drawn vehicles, or other vehicles might occur. These locations might be relatively confined or might occur randomly over a segment of roadway. Vehicular Traffic signs should be used only at locations where the road user's sight distance is restricted, or the condition, activity, or entering traffic would be unexpected. If the condition or activity is seasonal or temporary, the Vehicular Traffic sign should be removed or covered when the condition or activity does not exist. The Emergency Vehicle sign with the EMERGENCY SIGNAL AHEAD supplemental plaque shall be placed in advance of all emergency-vehicle traffic control signals.

Fire Station, Black and White

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the…

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the roadway by trucks, bicyclists, farm vehicles, emergency vehicles, golf carts, horse-drawn vehicles, or other vehicles might occur. These locations might be relatively confined or might occur randomly over a segment of roadway. Vehicular Traffic signs should be used only at locations where the road user's sight distance is restricted, or the condition, activity, or entering traffic would be unexpected. If the condition or activity is seasonal or temporary, the Vehicular Traffic sign should be removed or covered when the condition or activity does not exist. The Emergency Vehicle sign with the EMERGENCY SIGNAL AHEAD supplemental plaque shall be placed in advance of all emergency-vehicle traffic control signals.

Fire Station, Color

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the…

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the roadway by trucks, bicyclists, farm vehicles, emergency vehicles, golf carts, horse-drawn vehicles, or other vehicles might occur. These locations might be relatively confined or might occur randomly over a segment of roadway. Vehicular Traffic signs should be used only at locations where the road user's sight distance is restricted, or the condition, activity, or entering traffic would be unexpected. If the condition or activity is seasonal or temporary, the Vehicular Traffic sign should be removed or covered when the condition or activity does not exist. The Emergency Vehicle sign with the EMERGENCY SIGNAL AHEAD supplemental plaque shall be placed in advance of all emergency-vehicle traffic control signals.

Fire Station, Outline

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the…

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the roadway by trucks, bicyclists, farm vehicles, emergency vehicles, golf carts, horse-drawn vehicles, or other vehicles might occur. These locations might be relatively confined or might occur randomly over a segment of roadway. Vehicular Traffic signs should be used only at locations where the road user's sight distance is restricted, or the condition, activity, or entering traffic would be unexpected. If the condition or activity is seasonal or temporary, the Vehicular Traffic sign should be removed or covered when the condition or activity does not exist. The Emergency Vehicle sign with the EMERGENCY SIGNAL AHEAD supplemental plaque shall be placed in advance of all emergency-vehicle traffic control signals.

Fire Station, Silhouette

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the…

"Quarterly per pale dove-tailed, or and gules. DOVETAILED. A term borrowed from carpentry to show tinctures joined together by reversed wedges, which, being shaped like doves' tails, are by joiners called dovetailing." -Hall, 1862

Quarterly Dove-Tailed

"Quarterly per pale dove-tailed, or and gules. DOVETAILED. A term borrowed from carpentry to show tinctures…

The earthworms are also known as megadriles, in the families Tubificidae, Lumbriculidae, and Enchytraeidae. Earthworms have a pair of kidneys to every segment, each consisting of a coiled tube wrapped in a mass of small blood vessels, and at its inner end communicating with the body cavity by means of a funnel-shaped opening. Here is a diagram of an earthworm kidney., showing (b) blood vessel, (f) funnel opening into body cavity, (o) outer opening, (s)septum, (w) body wall

Earthworm Anatomy

The earthworms are also known as megadriles, in the families Tubificidae, Lumbriculidae, and Enchytraeidae.…

An illustration of military personnel forward marching in a four line formation.

Forward March in Four File Formation

An illustration of military personnel forward marching in a four line formation.

An illustration of a line of men entering and exiting a building.

Men Entering & Exiting Building

An illustration of a line of men entering and exiting a building.

"Gules, a bend sinister embattled, argent. EMBATTLED. A line, formed like the battlements on a wall or tower, is said to be embattled or crenelle. When the line is used to form one of the ordinaries, it is said to be embattled." -Hall, 1862

Bend Sinister Embattled

"Gules, a bend sinister embattled, argent. EMBATTLED. A line, formed like the battlements on a wall…

"Argent, a fess gules, embattled grady. EMBATTLED GRADY. Where the battlements gradually rise one above another." -Hall, 1862

Fess Embattled Grady

"Argent, a fess gules, embattled grady. EMBATTLED GRADY. Where the battlements gradually rise one above…

"Argent, a pale azure engrailed. ENGRAILED. Any object being edged with small semi-circles, the points turning outwards, is said to be engrailed." -Hall, 1862

Pale Engrailed

"Argent, a pale azure engrailed. ENGRAILED. Any object being edged with small semi-circles, the points…

"Argent, a bend gules, invected between two hurts. INVECTED. A line formed with small semicircles, with the points turned inward. Any ordinary drawn with this line is called invected." -Hall, 1862

Bend Invected

"Argent, a bend gules, invected between two hurts. INVECTED. A line formed with small semicircles, with…

"Figure 9- Anthrenus scrofulariae, enlarged; the short line shows natural size. a, b, larvae; c, pupa; d, imago" Elliot Coues, 1884 Carpet beetles are very small more oval to rounded shape. Their bright colorful scales vary in shades of tan, brown, red, gray, and white.

Various Stages of a Carpet Beetle

"Figure 9- Anthrenus scrofulariae, enlarged; the short line shows natural size. a, b, larvae; c, pupa;…

"Fig. 26 - Parts of a Bill. a, side of upper mandible; b, culmen; c, nasal fossa; d, nostril; e(see below); f, gape, or whole commissural line; g, rictus; h, commissural point or angle of the mouth; i, ramus of under jaw; j, tomia of under mandible (the reference lines e should have been drawn to indicate the correct tomia of upper mandible):k, angle of gonys; l, gonys; m, side of under mandible; n, tips of mandibles." Elliot Coues, 1884

The Parts of a Bird Bill

"Fig. 26 - Parts of a Bill. a, side of upper mandible; b, culmen; c, nasal fossa; d, nostril; e(see…

"PARTED PER PALE AND PER BEND SINISTER Counterchanged, or and gules. PARTY or PARTED signifies divided, and applies to the several parts of an escutcheon parted by a line, which always runs in the direction of one or more of the honourable ordinaries." -Hall, 1862

Parted Per Pale and Per Bend Sinister

"PARTED PER PALE AND PER BEND SINISTER Counterchanged, or and gules. PARTY or PARTED signifies divided,…

"PARTED PER PALE AND PER CHEVRON Gules and or, counter changed. PARTY or PARTED signifies divided, and applies to the several parts of an escutcheon parted by a line, which always runs in the direction of one or more of the honourable ordinaries." -Hall, 1862

Parted Per Pale and Per Chevron

"PARTED PER PALE AND PER CHEVRON Gules and or, counter changed. PARTY or PARTED signifies divided, and…

"Party per fess, engrailed, argent and gules. PARTY PER FESS. A shield parted in the centre by an horizontal line through the fess point." -Hall, 1862

Party Per Fess Engrailed

"Party per fess, engrailed, argent and gules. PARTY PER FESS. A shield parted in the centre by an horizontal…

"Parted per pale, gules and argent. PARTY PER PALE. This signifies a shield parted by a perpendicular line down the centre, so that one shield may contain two coats of arms." -Hall, 1862

Party Per Pale

"Parted per pale, gules and argent. PARTY PER PALE. This signifies a shield parted by a perpendicular…

An illustration of a line of seven boys playing the flute.

Seven Boys Playing Flute

An illustration of a line of seven boys playing the flute.

An illustration of seven boys playing the drums standing in a line.

Seven Boys Playing Drums

An illustration of seven boys playing the drums standing in a line.

"Fig 27. - Bones of the right wing of a duck, Clangula islandica, A, shoulder, omos; B, elbow, ancon; C, wrist, carpus; D, end of principal finger; E, end of hand proper, metacarpus. AB, upper arm, brachium; BC, fore-arm, antibrachium; CD, whole hand or pinion, manus; composed of CE, hand proper or metacarpus, excepting d2; ED, or d2, d3, d4, fingers, digits, digiti, h, humerus; rd, radius; ul, ulna; sc, outer carpal, scapholunare or radiale; cu, inner carpal, cuneiforme or ulnare; these two composing wrist or carpus. mc, the compound hand-bone or metcarpus, composed of three metacarpal bones, bearing as many digits - the outer digit seated upon a protuberance at the head of the metacarpal, the other two situated at the end of the bone. d2, the outer or radial digit, commonly called the thumb or pollex, composed or two phalanges; d3, the middle digit, of two phalanges; d4, the inner or ulnar digit, of one phalanx d2 is the seat of the feathers of the bastard wing or alula. D to C (whole pinion), seat of the flight feathers called primaries; C to B (fore-arm), seat of the secondaries; at B and above it in direction of A, seat of tertiaries proper; below A, in direction of B, seat of scapularies (upon pteryla humeralis), often called tertiaries. The wing shown half-spread: complete extension would bring A B C D into a right line; in complete folding C goes to A, and D to B; all these motions nearly in the plane of the paper. The elbow-joint and wrist are such perfect hinges, that, in opening or closing the wing, C cannot sink below the paper, nor D fly up above the paper, as would otherwise be the effect of the pressure of the air upon the flight-feathers. Observe also rd and ul are two rods connecting B and C; the construction of their joining at B and C, and with each other, is such, that they can slide lengthwise a little upon each other. Now when the point C, revolving about B, approaches A in the arc of a circle, rd pushes on sc, while ul pulls back cu; the motion is transmitted to D, and makes this point approach B. conversely, in opening the wing, rd pulls back sc, and ul pushes on cu, making D recede from B. In other words, the angle A B C cannot be increased or diminished without similarly increasing or diminishing the angle B C D; so that no part of the wing can be opened or shut without automatically opening or shutting the rest..." Elliot Coues, 1884

The Bones of the Right Wing of a Duck

"Fig 27. - Bones of the right wing of a duck, Clangula islandica, A, shoulder, omos; B, elbow, ancon;…

Illustration used to prove the theorem "If three or more parallel lines intercept equal segments on one transversal, they intercept equal segments on any other transversal."

4 Parallel Lines Cut By 2 Transversals

Illustration used to prove the theorem "If three or more parallel lines intercept equal segments on…

Illustration used to prove the theorem "The line bisecting one of the non parallel sides of a trapezoid and parallel to the bases bisects the other of the non parallel sides also."

Line Bisecting Trapezoid Sides

Illustration used to prove the theorem "The line bisecting one of the non parallel sides of a trapezoid…

Illustration used to prove "The line bisecting one side of a triangle and parallel to another side bisects the third side."

Line Bisecting Side of a Triangle

Illustration used to prove "The line bisecting one side of a triangle and parallel to another side bisects…

Illustration used to prove "The line joining the mid-points of two sides of a triangle is parallel to the third side and equal to one half the third side."

Line Joining Midpoints on a Triangle

Illustration used to prove "The line joining the mid-points of two sides of a triangle is parallel to…

Illustration used to show how to divide a given straight line into any number of equal parts.

Line Divided Into Equal Parts

Illustration used to show how to divide a given straight line into any number of equal parts.

Illustration used to show "The two perpendiculars to the sides of an angle from any point in its bisector are equal."

Perpendiculars To The Sides Of An Angle

Illustration used to show "The two perpendiculars to the sides of an angle from any point in its bisector…

Illustration used to show "The two perpendiculars to the sides of an angle from any point not in its bisector are unequal."

Perpendiculars To The Sides Of An Angle

Illustration used to show "The two perpendiculars to the sides of an angle from any point not in its…

Illustration used to prove "The bisectors of the angles of a triangle are concurrent in a point which is equidistant from the three sides of the triangle."

Angle Bisectors In A Triangle

Illustration used to prove "The bisectors of the angles of a triangle are concurrent in a point which…

Illustration used to prove "The perpendicular bisectors of the sides of a triangle are concurrent in a point which is equidistant from the three vertices of the triangle."

Perpendicular Bisectors In A Triangle

Illustration used to prove "The perpendicular bisectors of the sides of a triangle are concurrent in…

Illustration used to show "The altitudes of a triangle are concurrent."

Altitudes In A Triangle

Illustration used to show "The altitudes of a triangle are concurrent."

Illustration used to show "Any two medians of a triangle intersect each other in a trisection point of each."

Medians In A Triangle

Illustration used to show "Any two medians of a triangle intersect each other in a trisection point…

Illustration used to show the various parts of a triangle: sides, angles, medians, altitudes, bisectors, and segments.

Parts Of A Triangle

Illustration used to show the various parts of a triangle: sides, angles, medians, altitudes, bisectors,…

"Grains with Five Prongs. GRAIN. An iron instrument with four or more barbed points, and a line attached to it, used at sea for striking and taking fish." -Whitney, 1911

Grain Spear

"Grains with Five Prongs. GRAIN. An iron instrument with four or more barbed points, and a line attached…

"Lyle Life-saving Gun. LYLE GUN, a bronze life-saving gun, designed by Captain D. A. Lyle of the United States Ordnance Department for throwing elongated projectiles having lines attached to them, in order to establish communication between the shore and a stranded or wrecked vessel. The projectile has at the rear end a shank, to which the line is attached." -Whitney, 1911

Lyle Gun

"Lyle Life-saving Gun. LYLE GUN, a bronze life-saving gun, designed by Captain D. A. Lyle of the United…

This heraldic chair was used by the royal ancestors of the Saxon line.

Heraldic Chair

This heraldic chair was used by the royal ancestors of the Saxon line.

Color flag of Comoros. Four equal horizontal bands of yellow (top), white, red, and blue, with a green isosceles triangle based on the hoist; centered within the triangle is a white crescent with the convex side facing the hoist and four white, five-pointed stars placed vertically in a line between the points of the crescent; the horizontal bands and the four stars represent the four main islands of the archipelago - Mwali, N'gazidja, Nzwani, and Mahore (Mayotte - territorial collectivity of France, but claimed by Comoros).

Flag of Comoros, 2009

Color flag of Comoros. Four equal horizontal bands of yellow (top), white, red, and blue, with a green…

Black and white outline flag of Comoros. Four equal horizontal bands of yellow (top), white, red, and blue, with a green isosceles triangle based on the hoist; centered within the triangle is a white crescent with the convex side facing the hoist and four white, five-pointed stars placed vertically in a line between the points of the crescent; the horizontal bands and the four stars represent the four main islands of the archipelago - Mwali, N'gazidja, Nzwani, and Mahore (Mayotte - territorial collectivity of France, but claimed by Comoros)

Flag of Comoros, 2009

Black and white outline flag of Comoros. Four equal horizontal bands of yellow (top), white, red, and…

Color flag of Syria. Three equal horizontal bands of red (top), white, and black, colors associated with the Arab Liberation flag; two small, green, five-pointed stars in a horizontal line centered in the white band; former flag of the United Arab Republic where the two stars represented the constituent states of Syria and Egypt; similar to the flag of Yemen, which has a plain white band, Iraq, which has an Arabic inscription centered in the white band, and that of Egypt, which has a gold Eagle of Saladin centered in the white band; the current design dates to 1980.

Flag of Syria, 2009

Color flag of Syria. Three equal horizontal bands of red (top), white, and black, colors associated…

Black and white outline flag of Syria. Three equal horizontal bands of red (top), white, and black, colors associated with the Arab Liberation flag; two small, green, five-pointed stars in a horizontal line centered in the white band; former flag of the United Arab Republic where the two stars represented the constituent states of Syria and Egypt; similar to the flag of Yemen, which has a plain white band, Iraq, which has an Arabic inscription centered in the white band, and that of Egypt, which has a gold Eagle of Saladin centered in the white band; the current design dates to 1980

Flag of Syria, 2009

Black and white outline flag of Syria. Three equal horizontal bands of red (top), white, and black,…

Illustration used to prove "If two circumferences meet at a point which is not on their line of centers, they also meet in one other point."

Circumferences of 2 Circles

Illustration used to prove "If two circumferences meet at a point which is not on their line of centers,…

Illustration of a circle used to prove "All angles inscribed in the same segment are equal."

Angles Inscribed in the Same Segment Circle Proof

Illustration of a circle used to prove "All angles inscribed in the same segment are equal."

Illustration of a circle used to prove "Any angle inscribed in a segment less than a semicircle is an obtuse angle."

Obtuse Angles Inscribed in Circle Proof

Illustration of a circle used to prove "Any angle inscribed in a segment less than a semicircle is an…

"Upper parts olive-green, more or less bright, sometimes rather olive-ashy, always brightest on the rump; under parts dull ashy-white or yellowish-white. Wings and tail dusky, strongly edged with yellowish, the inner wing-quills with whitish. On the secondaries, this yellowish edging stops abruptly in advance of the ends of the coverts, leaving a pure blackish interval in advance of the white tips of the greater coverts: this, and the similar tips of the median coverts, form two white bars across the wings; inner webs of the quills and tail feathers edged with white. Supercilary line and extreme forehead hoary-whitish. Crown black, enclosing a large space, the middle of which is flame colored, bordered with pure yellow. The black reaches across the forehead; but behind, the yellow flame-color reach the general olive of the upper parts. Or, the top of the head may be described as a central bed of flame-color, bounded in front and on the sides with clear yellow, this similarly bounded by black, this again in the same manner by hoary-whitish. Smaller than R. calendula; overlying nasal plumes larger." Elliot Coues, 1884

Golden Crested Kinglet

"Upper parts olive-green, more or less bright, sometimes rather olive-ashy, always brightest on the…

"Grayish-blue, bluer on the crown, hoary on the rump, the forehead black, continuous with a black superciliary line. Edges of eyelids white, and above these a shade on the breast. Wings dark brown, the outer webs, especially of the inner quills, edged with hoary, and the inner webs of most bordered with white. Tail jet-black, the outer feather entirely or mostly white, the next one about half white, the third one tipped with white. Bill and feet black." Elliot Coues, 1884

Blue-gray Gnat-catcher

"Grayish-blue, bluer on the crown, hoary on the rump, the forehead black, continuous with a black superciliary…

"Upper parts olivaceous-ash, wings and tail darker, edged with the color of the back, or even a brighter tint, sometimes nearly as yellowish as in Regulus. Under parts sordid ashy-white. Crest-black, with a central field like the back. Whole throat black, as in species of parus. A black line runs behind the eye and curves down over the auriculars, distinguished from the black of the crest and throat by the white of the side of the head and white superciliary stripe; a half-collar of black on the nape, descending on the sides of the neck, there separated from the black crescent of the auriculars by a white crescent, which latter is continuous with the white on the superciliary line; considerable whitish speckling in the black of the forehead and lores. Bill blackish-plumbeous; feet plumbeous." Elliot Coues, 1884

Bridled Titmouse

"Upper parts olivaceous-ash, wings and tail darker, edged with the color of the back, or even a brighter…

Black line illustration of a 13 Star United States flag. The original 13 stars represent the states of Delaware, Pennsylvania, New Jersey, Georgia, Connecticut, Massachusetts, Maryland, South Carolina, New Hampshire, Virginia, New York, North Carolina, and Rhode Island. This flag was in use from June 14, 1777 until May 1, 1795.

13 Star United States Flag, 1776

Black line illustration of a 13 Star United States flag. The original 13 stars represent the states…

Black line illustration of a 20 Star United States flag. The additional stars represent the states of Indiana, Louisiana, Mississippi, Ohio, and Tennessee. This flag was in use from July 04, 1818 until July 3, 1819.

20 Star United States Flag, 1818

Black line illustration of a 20 Star United States flag. The additional stars represent the states of…

Black line illustration of a 21 Star United States flag. The additional star represents the state of Illinois. This flag was in use from July 04, 1819 until July 3, 1820.

21 Star United States Flag, 1819

Black line illustration of a 21 Star United States flag. The additional star represents the state of…

Black line illustration of a 23 Star United States flag. The additional stars represent the states of Alabama and Maine. This flag was in use from July 04, 1820 until July 3, 1822.

23 Star United States Flag, 1820

Black line illustration of a 23 Star United States flag. The additional stars represent the states of…

Black line illustration of a 24 Star United States flag. The additional star represents the state of Missouri. This flag was in use from July 04, 1822 until July 3, 1836.

24 Star United States Flag, 1822

Black line illustration of a 24 Star United States flag. The additional star represents the state of…

Black line illustration of a 25 Star United States flag. The additional star represents the state of Arkansas. This flag was in use from July 04, 1836 until July 3, 1837.

25 Star United States Flag, 1836

Black line illustration of a 25 Star United States flag. The additional star represents the state of…

Black line illustration of a 26 Star United States flag. The additional star represents the state of Michigan. This flag was in use from July 04, 1837 until July 3, 1845.

26 Star United States Flag, 1837

Black line illustration of a 26 Star United States flag. The additional star represents the state of…

Black line illustration of a 28 Star United States flag. The additional star represents the state of Texas. This flag was in use from July 04, 1846 until July 3, 1847.

28 Star United States Flag, 1846

Black line illustration of a 28 Star United States flag. The additional star represents the state of…

Black line illustration of a 29 Star United States flag. The additional star represents the state of Iowa. This flag was in use from July 04, 1847 until July 3, 1848.

29 Star United States Flag, 1847

Black line illustration of a 29 Star United States flag. The additional star represents the state of…

Black line illustration of a 30 Star United States flag. The additional star represents the state of Wisconsin. This flag was in use from July 04, 1848 until July 3, 1851.

30 Star United States Flag, 1848

Black line illustration of a 30 Star United States flag. The additional star represents the state of…

Black line illustration of a 31 Star United States flag. The additional star represents the state of California. This flag was in use from July 04, 1851 until July 3, 1858.

31 Star United States Flag, 1851

Black line illustration of a 31 Star United States flag. The additional star represents the state of…

Black line illustration of a 32 Star United States flag. The additional star represents the state of Minnesota. This flag was in use from July 04, 1858 until July 3, 1859.

32 Star United States Flag, 1858

Black line illustration of a 32 Star United States flag. The additional star represents the state of…

Black line illustration of a 33 Star United States flag. The additional star represents the state of Oregon. This flag was in use from July 04, 1859 until July 3, 1861.

33 Star United States Flag, 1859

Black line illustration of a 33 Star United States flag. The additional star represents the state of…

Black line illustration of a 34 Star United States flag. The additional star represents the state of Kansas. This flag was in use from July 04, 1861 until July 3, 1863.

34 Star United States Flag, 1861

Black line illustration of a 34 Star United States flag. The additional star represents the state of…