A method to create steel balls by inserting the sphere in a hollow cylinder and rotating the ball with two cylinders covered with leather on the top.

Device Turning Steel Sphere Balls

A method to create steel balls by inserting the sphere in a hollow cylinder and rotating the ball with…

"The Helm of Baronet and Knights is of steel, garnished with silver, and standing affronté; the vizor is raised, and without bars."—Aveling, 1891

Helm of Baronet

"The Helm of Baronet and Knights is of steel, garnished with silver, and standing affronté; the…

"a Bessemer converter, which is an egg-shaped furnace built of wrought iron plates and lined with a thick layer of refractory material. The bottom is perforated with holes so that streams of air can be blown through the molten metal." -Brownlee 1907

Bessemer Converter

"a Bessemer converter, which is an egg-shaped furnace built of wrought iron plates and lined with a…

A cantilever bridge is a bridge built using cantilevers: structures that project horizontally into space, supported on only one end.

Cantilever

A cantilever bridge is a bridge built using cantilevers: structures that project horizontally into space,…

Construction of a cantilever bridge. A cantilever bridge is a bridge built using cantilevers: structures that project horizontally into space, supported on only one end.

Cantilever

Construction of a cantilever bridge. A cantilever bridge is a bridge built using cantilevers: structures…

Construction of a cantilever bridge. A cantilever bridge is a bridge built using cantilevers: structures that project horizontally into space, supported on only one end.

Cantilever

Construction of a cantilever bridge. A cantilever bridge is a bridge built using cantilevers: structures…

A compound riveted girder is designed to bear a large load in a building or bridge, and is made of either iron or steel.

Compound Riveted Girder (side by side)

A compound riveted girder is designed to bear a large load in a building or bridge, and is made of either…

A compound riveted girder is designed to bear a large load in a building or bridge, and is made of either iron or steel.

Compound Riveted Girder (Vertical)

A compound riveted girder is designed to bear a large load in a building or bridge, and is made of either…

An illustration of a expanded steel concrete slab.

Expanded Steel Concrete Slab

An illustration of a expanded steel concrete slab.

An illustration of a foundry crane which is used in steel-making.

Foundry Crane

An illustration of a foundry crane which is used in steel-making.

"...in which is shown as electromagnet mounted with its poles in proximity to those of a steel magnet, and connected with a driving-wheel and belt, by which it can be given a rapid rotary motion, so that its poles alternately rotate past those of the steel magnet, producing an alternate reversal of polarity in its core by which an alternating current is generated in its coils." -Atkinson 1903

Dynamo

"...in which is shown as electromagnet mounted with its poles in proximity to those of a steel magnet,…

"If an electromagnet be subsituted for the steel magnet as shown...and the terminals of its coils connected with the brushs as shown each magnet will generate a current in the coils of the other magnet." -Atkinson 1903

Dynamo

"If an electromagnet be subsituted for the steel magnet as shown...and the terminals of its coils connected…

"Wire-gage, a gage for measuring the thickness of wire and sheet-metal. It is usually a plate of steel having round the edge a series of notches of standard opening." -Whitney, 1911

Wire Gauge

"Wire-gage, a gage for measuring the thickness of wire and sheet-metal. It is usually a plate of steel…

The Gauntlet is a piece of protective armor for the hand, dating back to the 12th century. The first gauntlets were leather covered gloves with an unarticulated metal back. They evolved from the chain mail bag, which , in the 12th century, terminated at the sleeves of the hauberk. The gauntlet of the 14th century had separate, but unjointed fingers. This gauntlet was superseded by the 'mitten'.

Gauntlet

The Gauntlet is a piece of protective armor for the hand, dating back to the 12th century. The first…

A steel rod being held horizontally by a pair of hands.

Hands with rod

A steel rod being held horizontally by a pair of hands.

Helical gearing is a modification of ordinary toothed gearing in which the pitch surfaces may be cylinders or cones (as in spur or bevel gearing); but the teeth intersect the pitch surfaces in helical lines. These wheels work much more smoothly and provide more resilience than ordinary gearing.

Helical Gearing

Helical gearing is a modification of ordinary toothed gearing in which the pitch surfaces may be cylinders…

A hoe inside of a circle

Hoe logo

A hoe inside of a circle

An I-Beam girder is a load bearing beam of steel or iron. It is shaped like a capital letter I.

I-Beam Girder

An I-Beam girder is a load bearing beam of steel or iron. It is shaped like a capital letter I.

A lattice bridge, side elevation.

Lattice

A lattice bridge, side elevation.

A lattice bridge, side elevation.

Lattice

A lattice bridge, side elevation.

This illustration shows a light inverted bow-string girder, as well as a section.

Light Inverted Bow-String Girder (Elevation and Section)

This illustration shows a light inverted bow-string girder, as well as a section.

An illustration of a rectangle shaped steel magnet with "consequent poles at a and b." -Century, 1889

Rectangle Shaped Steel Magnet

An illustration of a rectangle shaped steel magnet with "consequent poles at a and b." -Century, 1889

"A bar of steel which is a magnet, suspended in such a way that it can freely turn to the north or south." —Wells, 1857

Magnetic Needle

"A bar of steel which is a magnet, suspended in such a way that it can freely turn to the north or south."…

"Experiment illustrating the molecular theory of magnetism. Coarse steel filings are placed inside a small glass tube and the contents magnetized. It will be found that filing which at first had no definite arrangement will rearrange themselves under the influence of magnetic force, and assume symmetrical position, each one lying in line with, or parallel to its neighbor, as shown in the lower figure." -Hawkins, 1917

Magnetism

"Experiment illustrating the molecular theory of magnetism. Coarse steel filings are placed inside a…

An illustration of a 13th century mask of steel.

Mask of Steel

An illustration of a 13th century mask of steel.

The 'mitten' superseded the gauntlet of the 14th century. Rather than having separate, unjointed fingers, it had jointed steel plates (meshed), for the fingers.

Mitten (Armor)

The 'mitten' superseded the gauntlet of the 14th century. Rather than having separate, unjointed fingers,…

"An open hearth furnace has a large bed (E) lined with fire-brick and sand (H) on which the charge is placed. Gas is used as fuel and is heated before entering the furnace by pass-heated gas is passed into the furnace through a pipe (a), while through another flue (b) aur enters which has been similarly heated...hot, gaseous product escapes through checkerworks (C,D)..." -Brownlee 1907

Open Hearth Furnace

"An open hearth furnace has a large bed (E) lined with fire-brick and sand (H) on which the charge is…

"Pernot and Ponsard Furnaces and Allied Appliances. The pernot furnace as applied to the steel making differs in no material respect from the Pernot puddling furnace; it is substantially a Siemens-Martin furnace with a rotating bed. The hearth is a saucer-shaped cavity supported by an iron frame, mounted on the top of a slightly inclined nearly verticle axis, and running on wheels upon a rail or guide supported on a stout bogie." — The Encyclopedia Britannica, 1893

Pernot Furnace

"Pernot and Ponsard Furnaces and Allied Appliances. The pernot furnace as applied to the steel making…

A riveted steel plate girder is designed to bear a large load in a building or bridge, and is made of steel.

Riveted Steel Plate Girder

A riveted steel plate girder is designed to bear a large load in a building or bridge, and is made of…

The sabre is type of sword that has a single blade. This sabre is a cavalry dress sword that is curved and made out of steel. It is engraved with scenes of cavalry men with their horses.

Sabre

The sabre is type of sword that has a single blade. This sabre is a cavalry dress sword that is curved…

"A skull-cap of steel worn sometimes under and sometimes over the camail." -Whitney, 1911

Secret

"A skull-cap of steel worn sometimes under and sometimes over the camail." -Whitney, 1911

This illustration shows a simple lattice girder.

Simple Lattice Girder (Elevator and Elevation)

This illustration shows a simple lattice girder.

A steel sink surrounded by pots and dishes.

Sink

A steel sink surrounded by pots and dishes.

This illustration shows an example of a skew bevel gear.

Skew Bevel (gear)

This illustration shows an example of a skew bevel gear.

"In this machine the knife or cutter a is an endless band of steel which revolves at considerable speed with its cutting edges close to the sides of a pair of rollers through which the leather is fed and pressed against the knife. The lower of these rollers is made of short segments or rings, each separately capable of yielding to some extent so as to accommodate itself to the inequal thickness of various parts of a hide." —The Encyclopedia Britannica, 1910

Splitting Machine

"In this machine the knife or cutter a is an endless band of steel which revolves at considerable speed…

"If a light strip of steel is firmly gripped at one end in a vice and the other end plucked aside, it will, when let go, vibrate backwards and forwards as shown; and if the vibrations are sufficiently rapid, a musical note will be produced." -New, 1891

Tone

"If a light strip of steel is firmly gripped at one end in a vice and the other end plucked aside, it…