"Section of Ammonites obtusus, showing the interior chambers and siphuncle." — Chambers' Encyclopedia, 1875

Ammonite

"Section of Ammonites obtusus, showing the interior chambers and siphuncle." — Chambers' Encyclopedia,…

"Battery and lamp set for illuminating partition interiors." —Croft 1915

Battery and Lamp

"Battery and lamp set for illuminating partition interiors." —Croft 1915

"The illustration represents a cubiculum, or small chamber, as most of them look when discovered. The graves have been opened and the bodies taken away."—Webster, 1913

Interior of the Catacombs

"The illustration represents a cubiculum, or small chamber, as most of them look when discovered. The…

"The narrow room in which the House of Commons holds its sessions contains seats for less than 350 of the 707 members. The discomfort in crowding is compensated for by the ease of hearing. The representative sit on benches facing one another across the aisle. The Speaker of the House occupies a chair at the end of the room. On his right are the members of the Ministry; on his left, the Opposition. The Speaker's symbol, the mace, is carried before him when he formally leaves and enters the House, and remains on the table while he occupies the chair."—Webster, 1920

Interior of the House of Commons

"The narrow room in which the House of Commons holds its sessions contains seats for less than 350 of…

The courtyard of an antique structure.

Courtyard of a House

The courtyard of an antique structure.

"Cast or mold of the interior of the left ventricle of the heart of a deer. Shows that the left ventricular cavity in conical and spiral in its nature."—Pettigrew, 1874

Heart of a Deer

"Cast or mold of the interior of the left ventricle of the heart of a deer. Shows that the left ventricular…

"Rhynchonella psittacea. Interior of doral valve. s, sockets; b, dental plates; V, mouth; de, labial appendage in itsnatural position; d, appendage extended or unrolled." — Encyclopedia Britanica, 1893

Dorsal Valve

"Rhynchonella psittacea. Interior of doral valve. s, sockets; b, dental plates; V, mouth; de, labial…

The interior of a caprificated fig.

Fig

The interior of a caprificated fig.

The interior of a noncaprificated fig.

Fig

The interior of a noncaprificated fig.

"Interior of Fort Sumter after the bombardment in 1863." -Gordy, 1916

Fort Sumter

"Interior of Fort Sumter after the bombardment in 1863." -Gordy, 1916

"Section of Fortified Wall. (Interior on the left; exterior on the right.) a, a, is the abatis; b, b, the counterscarp; c, c, the palisade; d, d, the scarp; f, f, the fraise; f, e, g, g, the parapet; h, the banquette; and i, g, the breast-height." -Whitney, 1911

Section of Fortified Wall

"Section of Fortified Wall. (Interior on the left; exterior on the right.) a, a, is the abatis; b, b,…

The Great Pyramid of Giza, also called Khufu's Pyramid or the Pyramid of Khufu, and Pyramid of Cheops, is the oldest and largest of the three pyramids in the Giza Necropolis bordering what is now Cairo, Egypt, and is the only remaining member of the Seven Wonders of the Ancient World. The Great Pyramid is the only pyramid known to contain both ascending and descending passages. There are three known chambers inside the Great Pyramid. These are arranged centrally, on the vertical axis of the pyramid.

Great Pyramid of Giza, Cross Section

The Great Pyramid of Giza, also called Khufu's Pyramid or the Pyramid of Khufu, and Pyramid of Cheops,…

The Grand Gallery features a corbel haloed design and several cut "sockets" spaced at regular intervals along the length of each side of its raised base with a "trench" running along its center length at floor level. What purpose these sockets served is unknown. An antechamber leads from the Grand Gallery to the King's Chamber.

Great Pyramid of Giza, Section of the Grand Gallery

The Grand Gallery features a corbel haloed design and several cut "sockets" spaced at regular…

The King's Chamber is lined with red granite brought from Aswan 935 km (580 miles) to the south, of which the blocks used for the roof are estimated to weigh 50 to 80 tons. Egyptologists believe they were transported on barges down the Nile river.

Great Pyramid of Giza, King's Chamber

The King's Chamber is lined with red granite brought from Aswan 935 km (580 miles) to the south, of…

"The <em>Humble-bees</em>, or as they are often called in this country, the <em>Bumble-bees</em> are of many species, but they all resemble the common honey-bee in their habits." &mdash Goodrich, 1859

Interior of the Humble-Bee's Nest

"The Humble-bees, or as they are often called in this country, the Bumble-bees are…

"Interior view of Kaid Bey Mosque, Cairo." — Encyclopedia Britanica, 1893

Kaid Bey Mosque

"Interior view of Kaid Bey Mosque, Cairo." — Encyclopedia Britanica, 1893

"Interior of Kait Bey Mosque." &mdash; The Encyclopedia Britannica, 1910

Kait Bey Mosque

"Interior of Kait Bey Mosque." — The Encyclopedia Britannica, 1910

"Interior of the church of Kalb-Lauzeh." &mdash; The Encyclopedia Britannica, 1910

Kalb-Lauzeh

"Interior of the church of Kalb-Lauzeh." — The Encyclopedia Britannica, 1910

Illustration showing that when two parallel lines are cut by a transversal, the exterior-interior angles are equal.

Parallel Lines Cut By A Transversal

Illustration showing that when two parallel lines are cut by a transversal, the exterior-interior angles…

Illustration showing that when two parallel lines are cut by a transversal, the two interior angles on the same side of the transversal are supplementary.

Parallel Lines Cut By A Transversal

Illustration showing that when two parallel lines are cut by a transversal, the two interior angles…

USS <em>Monitor</em> was the first ironclad warship commissioned by the United States Navy. <em>Monitor</em> consisted of a heavy round revolving iron gun turret on the deck, housing two 11 inch Dahlgren guns, paired side by side.

Interior of the Monitor's Turret

USS Monitor was the first ironclad warship commissioned by the United States Navy. Monitor

The interior of a room of General Washington's headquarters in Newburgh, New York.

Interior of Washington's Headquarters at Newburgh

The interior of a room of General Washington's headquarters in Newburgh, New York.

Illustration used to prove "An exterior angle of a triangle is equal to the sum of the two remote interior angles."

Exterior Angle Proof

Illustration used to prove "An exterior angle of a triangle is equal to the sum of the two remote interior…

Illustration used to prove "If the sides of any polygon are prolonged in succession one way, no two adjacent sides being prolonged through the same vertex, the sum of the exterior angles thus formed is four right angles."

Sum of Exterior Angles of a Polygon Proof

Illustration used to prove "If the sides of any polygon are prolonged in succession one way, no two…

Illustration used to prove "The sum of all the angles of any polygon is twice as many right angles as the polygon has sides, less four right angles."

Sum of Interior Angles of a Polygon Proof

Illustration used to prove "The sum of all the angles of any polygon is twice as many right angles as…

"The decoration of the interiors of the buildings of the Renaissance is also copied from ancient Roman architecture. The rooms are either vaulted or have flat ceilings, but in both cases are adorned with paintings after the manner of those discovered in the Baths of Titus, or by panel-work, that is, sunken coffers with a regularly distributed enrichment [shown here]. These panels are themselves often adorned with historical or allegorical paintings, or with arabesques. Ornamented panels were employed in large palaces for horizontal ceilings, as also in churches, though in the latter case they were more often applied to cupola vaulting, as notable in St. Peter's."

Interior View of St. Peter's at Rome

"The decoration of the interiors of the buildings of the Renaissance is also copied from ancient Roman…

"Interior of S. Clemente in Rome." &mdash; The Encyclopedia Britannica, 1910

S. Clemente

"Interior of S. Clemente in Rome." — The Encyclopedia Britannica, 1910

The Interior Scallop Shell was used as a water basin in the form of a shallow dish and as a decorative background for vases and busts. It was extensively used during the later Renaissance.

Interior Scallop Shell

The Interior Scallop Shell was used as a water basin in the form of a shallow dish and as a decorative…

"Interior mechanism of a spinet. A, Jack; B, tongue; C, quill; D, bristle; E, cloth damper; F, pivot; G, wire."&mdash;Finley, 1917

Interior mechanism of a spinet

"Interior mechanism of a spinet. A, Jack; B, tongue; C, quill; D, bristle; E, cloth damper; F, pivot;…

"Interior, St. Clare's, Liverpool." &mdash; The Encyclopedia Britannica, 1910

St. Clare's

"Interior, St. Clare's, Liverpool." — The Encyclopedia Britannica, 1910

This is a drawing of the interior of the St. Peter's Basilica located in the Vatican city of Rome, Italy. The interior space of the church was designed by Giovanni Paolo Panini an Italian painter and architect. The interior space is the largest interior of any Christian church in the world.

Interior of St. Peter's Basilica

This is a drawing of the interior of the St. Peter's Basilica located in the Vatican city of Rome, Italy.…

"Cross section of the interior of St. Sophia." &mdash; The Encyclopedia Britannica, 1910

St. Sophia

"Cross section of the interior of St. Sophia." — The Encyclopedia Britannica, 1910

The interior has a richer appearance, chiefly owing to the use of columns of a round cylindrical shape. These are, moreover, of the most varied form, and without exception represent objects drawn from the vegetable world.

Interior of the Temple of Philæ

The interior has a richer appearance, chiefly owing to the use of columns of a round cylindrical shape.…

"Interior view of Trajan's Basilica." &mdash; Encyclopedia Britanica, 1893

Trajan's Basilica

"Interior view of Trajan's Basilica." — Encyclopedia Britanica, 1893

Illustration to show that if from any point in the base of an isosceles triangle parallels to the legs are drawn, a parallelogram is formed whose perimeter is constant, being equal to the sum of the legs of the triangle.

Isosceles Triangle With Parallelogram inside

Illustration to show that if from any point in the base of an isosceles triangle parallels to the legs…

"Next to the Tower and the Abbey, Westminster Hall, adjoining the House of Parliament, is the most historic building in London. The hall was begun by William Rufus in 1097, and was enlarged by his successors. Richard II in 1397 added the great oak roof, which has lasted to this day. Here were held the trials of Strafford and Charles I."&mdash;Webster, 1920

Interior of Westminster Hall

"Next to the Tower and the Abbey, Westminster Hall, adjoining the House of Parliament, is the most historic…