"Ring armature of four pole dynamo; diagram of winding and connections, showing direction of the indced currents. the currents in the winding under the upper N and S poles are opposed to each other and flow to the external circuit by the positive brush 1, and back to this half of the armature by the negative brushes 3 and 4...The armature is said to be 'cross connected.' " -Hawkins, 1917

Ring Armature

"Ring armature of four pole dynamo; diagram of winding and connections, showing direction of the indced…

"Riding-boom. A boat-boom or long spar working in a hinge or goose-neck, designed to be lowered from abreast the fore-rigging to a horizontal position at right angles with the keel of the vessel ... a, life-line; b, lift; c, riding-boom; d, rope ladder; e, outhaul; f, after-boom guy." -Whitney, 1911

Riding Boom

"Riding-boom. A boat-boom or long spar working in a hinge or goose-neck, designed to be lowered…

This candlestick is made out of bronze in Vienna, Austria. It is tall in height and has a design of leaves on its pole, and horned animal heads at its base.

Candlestick

This candlestick is made out of bronze in Vienna, Austria. It is tall in height and has a design of…

The capital of a pillar or pilaster which supports an arch; more commonly called impost.

Chaptrel

The capital of a pillar or pilaster which supports an arch; more commonly called impost.

"A medium-capacity, double-pole circuit breaker (250 volts, 200 amp. General Electric Company, type C, form G)." —Croft 1920

Circuit Breaker

"A medium-capacity, double-pole circuit breaker (250 volts, 200 amp. General Electric Company, type…

"A heavy-current (2000 amp.) 650-volt, single-pole overload circuit breaker (General Electric Company, type C, form K2)." —Croft 1920

Circuit Breaker

"A heavy-current (2000 amp.) 650-volt, single-pole overload circuit breaker (General Electric Company,…

Decorative columns

Columns

Decorative columns

This margin drawing was created by German artist Albrecht Dürer in 1515. It is found in the prayer book of Emperor Maximilian. It is in the shape of a pole with an bird at the top and a human head at the bottom that is partly covered with wings. It stands on a bird's feet.

Margin Drawing

This margin drawing was created by German artist Albrecht Dürer in 1515. It is found in the prayer…

"Now it is the inclination of the Earth's axis, as above described, which causes the lengths of the days and nights to differ at the same place at different seasons of the year, for on reviewing the positions of the globe at A, it will be observed that the line formed by the enlightened and dark hemispheres, does not coincide with the line of the axis and the pole, but that the line formed by the darkness and the light, extends obliquely across the line of the Earth's axis, so that the north pole is in the light while the south is in the dark. In the position A, therefore, an observer at the north pole would see the sun constantly, while another at the south pole would not see it at all. Hence those living in the north temperate zone, at the season of the year when the earth is at A, or in the Summer, would have long days and short nights, in proportion as they approached the polar circle; while those who live in the south temperate zone, at the same time, and when it would be Winter there, would have long nights and short days in the same proportion." —Comstock, 1850

Earth Axis

"Now it is the inclination of the Earth's axis, as above described, which causes the lengths of the…

"Now it is the inclination of the Earth's axis, as above described, which causes the lengths of the days and nights to differ at the same place at different seasons of the year, for on reviewing the positions of the globe at A, it will be observed that the line formed by the enlightened and dark hemispheres, does not coincide with the line of the axis and the pole, but that the line formed by the darkness and the light, extends obliquely across the line of the Earth's axis, so that the north pole is in the light while the south is in the dark. In the position A, therefore, an observer at the north pole would see the sun constantly, while another at the south pole would not see it at all. Hence those living in the north temperate zone, at the season of the year when the earth is at A, or in the Summer, would have long days and short nights, in proportion as they approached the polar circle; while those who live in the south temperate zone, at the same time, and when it would be Winter there, would have long nights and short days in the same proportion." —Comstock, 1850

Earth Axis

"Now it is the inclination of the Earth's axis, as above described, which causes the lengths of the…

"The Earth, whose diameter is 7,912 miles, is represented by the globe, or sphere. The straight line passing through its center, and about which it turns, is called its axis, and the two extremities of the axis are the poles of the Earth, A being the north pole, and B the south pole. The line C D, crossing the axis, passes quite round the Earth, and divides it into two equal parts. This is called the equinoctial line, or the equator. That part of the Earth situated north of this line, is caled the northern hemisphere, and that part south of it, the southern hemisphere. The small circles E F and G H, surrounding or including the poles, are called the polar circles." —Comstock, 1850

Earth Divisions

"The Earth, whose diameter is 7,912 miles, is represented by the globe, or sphere. The straight line…

"Partial sketch of a four pole machine laid on its side." -Hawkins, 1917

Four Pole Machine

"Partial sketch of a four pole machine laid on its side." -Hawkins, 1917

A hand holding a bar magnet.

Hand with magnet

A hand holding a bar magnet.

"The hunting scenes are very numerous among their paintings, and the devices for capturing birds and beasts seem to have been as vaarious as they are in modern times." — Goodrich, 1844

Egyptian hunting party

"The hunting scenes are very numerous among their paintings, and the devices for capturing birds and…

"The magnetic poles of the earth do notc oincide with its geographical poles and, condequently, in some places, the magnetic needle does not point ot the geographical north. The angle that the axis of a compass-bneedle makes with the geographical meridian at any place is called the declination or variation of the needle at that place...Lines drawn through places on the earth where the declination is the sam are called isogonic lines, as shown." -Avery 1895

Isogonic Lines of Earth

"The magnetic poles of the earth do notc oincide with its geographical poles and, condequently, in some…

"The coils of wire may begin near one pole of the magnet and terminate near the other, or the wire may consist of shorter pieces wound over each other, on any part of the magnet. In either case, the ends of the wire, where several pieces are used, must be soldered to two strips of tinned sheet copper, for the combined positive and negative poles of the wires. To form the magnet, these pieces of copper are made to commnicate with the poles of the battery, by means of cups containing mercury, as shown in the figure, or by any other method." —Comstock, 1850

Magnet

"The coils of wire may begin near one pole of the magnet and terminate near the other, or the wire may…

"Salient pole, bipolar field magnet with single coil wound around the yoke." — Hawkins, 1917

Bipolar field magnet

"Salient pole, bipolar field magnet with single coil wound around the yoke." — Hawkins, 1917

"Modern dynamo with four consequent pole field magnets. In this construction the ring shaped yoke also serves as a frame; the circular form of yoke gives the least chance of magnetic leakage." — Hawkins, 1917

Multi-polar field magnet

"Modern dynamo with four consequent pole field magnets. In this construction the ring shaped yoke also…

"The polarity of the solenoidal magnet may be determined by holding it in the right hand so that the fingers point in the direction of the current; then the extended thumb will point toward the marked or north-seeking pole of the magnet." — Avery, 1895

Solenoidal magnet

"The polarity of the solenoidal magnet may be determined by holding it in the right hand so that the…

A man and a boy with a pole trying to fish something from the water.

Man and Boy

A man and a boy with a pole trying to fish something from the water.

An older man sitting upon a rock sleeping with a fishing pole in his hand.

Man asleep fishing

An older man sitting upon a rock sleeping with a fishing pole in his hand.

An illustration of a man repelling down a pole.

Man Repelling Down Pole

An illustration of a man repelling down a pole.

An illustration of a man leaning against a pole.

Man Resting Against Pole

An illustration of a man leaning against a pole.

An oar is a tool used for water propulsion. Oars in general have one flat blade at one end. The user grabs the oar at the other end.

Water Propulsion Oar

An oar is a tool used for water propulsion. Oars in general have one flat blade at one end. The user…

A greek pillar or corinthian design.

Corinthian Pillar

A greek pillar or corinthian design.

Pole, earl and duke of Suffolk, bore Azure a fesse between three leopards head gold.

Pole

Pole, earl and duke of Suffolk, bore Azure a fesse between three leopards head gold.

"Is fifteen to twenty inches long; color yellowish-brown; found on the European coasts; rare in England." — Goodrich, 1859

Pole

"Is fifteen to twenty inches long; color yellowish-brown; found on the European coasts; rare in England."…

"Two hoops of thin iron are placed upon an axis which passes through their poles. The two ends of each hoop cross each other at right angles, and are fastened together, and to the axis at the bottom. At the upper end they slide up and down on the axis, which is turned rapidly by wheel-work as represented. These hoops, before the motion begins, have an oval form, but when turned rapidly, the centrifugal force causes them to expand, or swell at the equator, while they are depressed at the poles, the two polar regions becoming no more distant than a and b." —Comstock, 1850

Pole Depression

"Two hoops of thin iron are placed upon an axis which passes through their poles. The two ends of each…

A pair of opposite poles attracting, the magnetic force shown by iron filings.

Attractive poles

A pair of opposite poles attracting, the magnetic force shown by iron filings.

The outline of a bar magnet, and the influence of its poles on a surface covered with iron filings.

Magnetic polse

The outline of a bar magnet, and the influence of its poles on a surface covered with iron filings.

Steel rods connecting the pump inside well tubing down-hole to the pumping jack on the surface.

Sucker Rod

Steel rods connecting the pump inside well tubing down-hole to the pumping jack on the surface.

"Suppose the Earth to be in her Summer solstice, which takes place on the 21st of June. At this period she will be at a, having her north pole, n, so inclined towards the Sun, that the whole arctic circle will be illuminated, and consequently the Sun's rays will extend 23.25 degrees, the breadth of the polar circle, beyond the north pole." —Comstock, 1850

Seasons

"Suppose the Earth to be in her Summer solstice, which takes place on the 21st of June. At this period…

"A pole is leaning against a wall A, against which it casts part of its shadow, and the remainder upon another wall B, at right angles with A. Let D be the source of light." (Britannica, 1891)

Shadow of an Pole

"A pole is leaning against a wall A, against which it casts part of its shadow, and the remainder upon…

A sphere with arcs and poles. "The distance of all points in the circumference of a circle of a sphere from its poles are equal."

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…

A sphere with quadrants and poles. "A point on the surface of a sphere, which is at the distance of a quadrant from each of two other points, not the extremities of a diameter, is a pole of the great circle passing through theses points."

Sphere With Quadrants and Poles

A sphere with quadrants and poles. "A point on the surface of a sphere, which is at the distance of…

"A two-pole front-connected knife switch fused a the handle end." —Croft 1920

Two-pole Knife Switch

"A two-pole front-connected knife switch fused a the handle end." —Croft 1920

"Thyrsus, a pole carried by Bacchus, and by Satyrs, Maenades, and others who engaged in Bacchic festivities and rites. It was sometimes terminated by the apple of the pine, or fir-cone, that tree being dedicated to Bacchus in consequence of the use of the turpentine which flowed from it, and also of its cones, in making wine. The monuments of ancient art, however, most commonly exhibit, instead of the pine-apple, a bunch of vine or ivy leaves, with grapes or berries, arranged into the form of a cone. The annexed cut shows the head of a thyrsus composed of the leaves and berries of the ivy, and surrounded by acanthus leaves. The fabulous history of Bacchus relates that he converted the thyrsi carried by himself and his followers into dangerous weapons, by concealing an iron point in the head of the leaves." &mdash Smith; 1873

Thyrsus

"Thyrsus, a pole carried by Bacchus, and by Satyrs, Maenades, and others who engaged in Bacchic festivities…