"Straighten right arm and right leg vigorously and swing butt of rifle against point of attack, pivoting the rifle in the left hand at about the height of the left shoulder, allowing the bayonet to pass to the rear on the left side of the head. Guard is resumed without command." — Moss, 1914

Butt strike

"Straighten right arm and right leg vigorously and swing butt of rifle against point of attack, pivoting…

Diagram illustrating gently inclined strata, with the clinometer in proper position to measure the dip at right angles to the strike.

Clinometer Measuring Inclined Strata

Diagram illustrating gently inclined strata, with the clinometer in proper position to measure the dip…

A billiard cue, a baseball bat, a tennis racket, all the instruments used in golf, are hammers.

A Hammer for Play

A billiard cue, a baseball bat, a tennis racket, all the instruments used in golf, are hammers.

There are about 50 different styles of hammers, each one having a trade name. They are of every size, from a tack-hammer, weighting a few ounces, up to the blacksmith's great straight-handled sledge-hammer, weighing twenty pounds or more. Many are named after the trade in which they are used.

Types of Hammers

There are about 50 different styles of hammers, each one having a trade name. They are of every size,…

A trip hammer resembles a hand-hammer held in a horizontal position. The hammer is placed at the end of a heavy beam pivoted near the opposite end. By means of simple machinery the handle was raised and then "tripped" or let fall, when the hammer-head delivered its blow upon the anvil. They were at first operated by water power, but later by steam power.

Horizontal Steam Power Hammer

A trip hammer resembles a hand-hammer held in a horizontal position. The hammer is placed at the end…

Diagram illustrating the relationships of dip and strike of the inclined strata of an outcropping series of ledges. The strike is represented by the horizontal line; the dip by the line at right angles to the strike.

Inclined Strata Dip and Strike

Diagram illustrating the relationships of dip and strike of the inclined strata of an outcropping series…

"Nordenfelt Machine Gun. 1-10, parts of frame; 11, breech plug; 12, striker; 13, extractor; 14, cartridge receiver; 15-18, 23-31, lock and trigger parts; 19-22, locking action; 32-35, loading action; 36-39, cartridge receiver; 40, cover; 41-44, parts of hand-lever; 45-49, traversing action; 50-55, elevating and trailing action; 56, 56, hopper and slide." — Encyclopedia Britannica, 1893

Machine Gun

"Nordenfelt Machine Gun. 1-10, parts of frame; 11, breech plug; 12, striker; 13, extractor; 14, cartridge…

"Nordenfelt Machine Gun." — Encyclopedia Britannica, 1893

Machine Gun

"Nordenfelt Machine Gun." — Encyclopedia Britannica, 1893

A mallet is a type of hammer with a head made of softer materials than the steel normally used in hammerheads, so as to avoid damaging a delicate surface.

Mallets

A mallet is a type of hammer with a head made of softer materials than the steel normally used in hammerheads,…

This pile driver is powered by a horse. The horse will pull a cord that raises the weight. When the weight reaches the top of the device, it is released. After being released it will fall a distance before striking an object below with great force causing it to pressed into the ground.

Pile Driver

This pile driver is powered by a horse. The horse will pull a cord that raises the weight. When the…

Such a hammer will deliver a blow at every stroke of the piston-rod, and with sufficient air-pressure will give from 200 to 1,000 blows a minute

Pneumatic Hammer

Such a hammer will deliver a blow at every stroke of the piston-rod, and with sufficient air-pressure…

An illustration of the plan of a strike fault. The fault surface is usually near vertical and the footwall moves either left or right or laterally with very little vertical motion. Strike-slip faults with left-lateral motion are also known as sinistral faults. Those with right-lateral motion are also known as dextral faults. A special class of strike-slip faults is the transform faults which are a plate tectonics feature related to spreading centers such as mid-ocean ridges.

Plan of a Strike Fault

An illustration of the plan of a strike fault. The fault surface is usually near vertical and the footwall…

"Striking machines are now very generally used for the operation. These consist of a drum or cylinder having a parallel series of projecting knives, or plates of gun-metal, set angularly across its surface. Underneath the drum is a brass bed, fixed on a yielding cushion, which can be pressed up or eased by means of a foot lever, according as the leather operated on is thick or thin." —The Encyclopedia Britannica, 1910

Striking Machine

"Striking machines are now very generally used for the operation. These consist of a drum or cylinder…

In 1838, Nasmyth, of England, planned his really great invention — the steam-hammer. His idea was to use the piston-rod of an upright steam-engine as the handle of a hammer that could move up and down between vertical guides. So perfect is the operation of one of these Titan hammers that the engineer can crack an egg with it, or deliver terrific, smashing blows that will mold a ton of iron into any shape he wishes.

Vertical Steam Hammer

In 1838, Nasmyth, of England, planned his really great invention — the steam-hammer. His idea…

A British Officer striking a young rebel.

Young Rebel

A British Officer striking a young rebel.