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"When bodies of equal weight are supported by the arms of a lever, they will balance each other when placed at equal distances from the fulcrum." —Quackenbos 1859

Balance

"When bodies of equal weight are supported by the arms of a lever, they will balance each other when…

"On this principle the common balance, represented [here] is constructed. A beam is poised on the top of a pillar, so as to be exactly horizontal. From each end of the beam, at equal distances from the fulcrum, a pan is suspended by means of cords. The object to be weighed is placed in one of these plans, and the weights in the other." —Quackenbos 1859

Balance

"On this principle the common balance, represented [here] is constructed. A beam is poised on the top…

"A simple battery constructed from sulphuric acid and zinc ." -Avery 1895

Simple Battery

"A simple battery constructed from sulphuric acid and zinc ." -Avery 1895

The simple enrichment bead moulding is an antique design formed of round pearls close together. This design is typically found on mouldings.

Simple Enrichment Bead Moulding

The simple enrichment bead moulding is an antique design formed of round pearls close together. This…

The simple enrichment bead moulding is an antique design formed of round pearls close together. This design is typically found on mouldings.

Simple Enrichment Bead Moulding

The simple enrichment bead moulding is an antique design formed of round pearls close together. This…

The simple enrichment bead moulding is an antique design formed of round pearls close together. This design is typically found on mouldings.

Simple Enrichment Bead Moulding

The simple enrichment bead moulding is an antique design formed of round pearls close together. This…

The simple enrichment bead moulding is an antique design formed of round pearls close together. This design is typically found on mouldings.

Simple Enrichment Bead Moulding

The simple enrichment bead moulding is an antique design formed of round pearls close together. This…

The simple enrichment bead moulding is an antique design formed of round pearls close together. This design is typically found on mouldings.

Simple Enrichment Bead Moulding

The simple enrichment bead moulding is an antique design formed of round pearls close together. This…

The simple enrichment bead moulding is an antique design formed of round pearls close together. This design is typically found on mouldings.

Simple Enrichment Bead Moulding

The simple enrichment bead moulding is an antique design formed of round pearls close together. This…

The simple enrichment bead moulding is an antique design formed of round pearls close together. This design is typically found on mouldings.

Simple Enrichment Bead Moulding

The simple enrichment bead moulding is an antique design formed of round pearls close together. This…

"Nachet's Combined Simple and Compound Microscope." —The Encyclopedia Britannica, 1903

Compound Microscope

"Nachet's Combined Simple and Compound Microscope." —The Encyclopedia Britannica, 1903

"The operation of the condenser is the reverse of that of the air pump, and is a much more simple machine. The air pump, will deprive a vessel of its ordinary quantity of air. The condenser, on the contrary, will double or treble the ordinary quantity of air in a close vessel according to the force employed. This instrument consists of a pump barrel and piston, a, a stop-cock b, and the vessel c furnished with a valve opening downwards. The orifice d is to admit the air, when the piston is drawn up to the top of the barrel." —Comstock, 1850

Condenser

"The operation of the condenser is the reverse of that of the air pump, and is a much more simple machine.…

"... shows one of the commonest (sic) forms in which this kind of lever appears,-the crowbar. The power is applied at the handle. The weight is at the other end, and consists of something to be moved. The fulcrum is a stone on which the crowbar rests." —Quackenbos 1859

Crowbar

"... shows one of the commonest (sic) forms in which this kind of lever appears,-the crowbar. The power…

"... a farmer with a crowbar, as shown, can move a rock which with his hands alone he could not stir." —Quackenbos 1859

Crowbar and Stone

"... a farmer with a crowbar, as shown, can move a rock which with his hands alone he could not stir."…

An illustration of simple doodad.

Doodad

An illustration of simple doodad.

An illustration of a simple doodad.

Simple Doodad

An illustration of a simple doodad.

The first step to drawing a house. Begin with a basic drawing.

Drawing a House 1

The first step to drawing a house. Begin with a basic drawing.

The second step to drawing a house. It becomes slightly more elaborated.

Drawing a House 2

The second step to drawing a house. It becomes slightly more elaborated.

The third step to drawing a house. The drawing becomes further elaborated as it reaches completion.

Drawing a House 3

The third step to drawing a house. The drawing becomes further elaborated as it reaches completion.

The jagged cells from the middle layers of pavement epithelium, from a vertical section of the gum of a newborn infant.

Pavement Epithelium

The jagged cells from the middle layers of pavement epithelium, from a vertical section of the gum of…

"A lever is an inflexible bar freely movable about a fixed axis called the fulcrum. If the fulcrum is between the power and weight, the lever is of the first class." — Avery, 1895

First Class Lever

"A lever is an inflexible bar freely movable about a fixed axis called the fulcrum. If the fulcrum is…

"A force pushing a weight from C to D, only raises it through the perpendicular height, E D, by acting along the whole length of the plane, C D; and if the plane be twice as it is high, one pound at B, acting over the pulley, D, would balance two pounds at A, or any where on the plane; and so of all other quantities and proportions." — Goodrich, 1844

Inclined Plane

"A force pushing a weight from C to D, only raises it through the perpendicular height, E D, by acting…

This cream jug is ornamented with a simple design with a large round handle. It is used to serve cream for coffee or tea service.

Cream Jug

This cream jug is ornamented with a simple design with a large round handle. It is used to serve cream…

"In mechanics, the word 'machine' signifies an instrument for the conversion of motion or the transference of energy." -Avery 1895

Man Using Lever and Fulcrum to Lift Rock

"In mechanics, the word 'machine' signifies an instrument for the conversion of motion or the transference…

"The object W to be lifted is called the weight; the force is represented by P; the point, or pivot, F is called the fulcrum." —Hallock 1905

Lever

"The object W to be lifted is called the weight; the force is represented by P; the point, or pivot,…

"The object W to be lifted is called the weight; the force is represented by P; the point, or pivot, F is called the fulcrum." —Hallock 1905

Lever

"The object W to be lifted is called the weight; the force is represented by P; the point, or pivot,…

"The object W to be lifted is called the weight; the force is represented by P; the point, or pivot, F is called the fulcrum." —Hallock 1905

Lever

"The object W to be lifted is called the weight; the force is represented by P; the point, or pivot,…

"In the single fixed pulley (fig. 1) there is no mechanical advantage, the power and weight being equal. It may be considered as a lever of the first kind with equal arms. In the single movable pulley (fig. 2) where the cords are parallel there is a mechanical advantage, there being an equilibrium when the power is considered as a lever of the second kind, in which the distance of the power from the fulcrum is double hat of the weight from the fulcrum." -Marshall

Pulley

"In the single fixed pulley (fig. 1) there is no mechanical advantage, the power and weight being equal.…

"In a system of pulleys (figs. 3,4) in which the same string passes round any number of pulleys, and the parts of it between the pulleys are parallel, there is an equilibrium when the power is to the weight as 1 to the number of strings at the lower block" -Marshall

Pulley

"In a system of pulleys (figs. 3,4) in which the same string passes round any number of pulleys, and…

"In a system in which each pulley hangs by a separate cord and the strings are parallel (fig. 5), there is an equilibrium when the power is to the weight as 11 to that power of 2 whose index is the number of movable pulleys." -Marshall

Pulley

"In a system in which each pulley hangs by a separate cord and the strings are parallel (fig. 5), there…

"The ball C is placed on a square frame between two upright wires, on each of which a ball slides so as to strike C when it descends. Let the ball A drop, and it will drive C to D... Let the ball B drop, and it will drive C to E; this is simple motion. Let A and B drop at the same instant, and they will drive C to F; this is resultant motion." —Quackenbos 1859

Resultant Motion with Ball

"The ball C is placed on a square frame between two upright wires, on each of which a ball slides so…

"A common scale-beam, used for weighing, is a lever, suspended at the centre of gravity, so that the two arms balance each other. Hence the machine is called a balance. The fulcrum, or what is called the pivot, is sharpended, like a wedge, and made of hardened steel, so as much as possible to avoid friction." -Comstock 1850

Scale

"A common scale-beam, used for weighing, is a lever, suspended at the centre of gravity, so that the…

"Many instruments in common use are on the principle of this kind of lever. Scissors, consists of two levers, the rivet being the fulcrum for both. The fingers are the power, and the cloth to be cut, the resistance to be overcome." -Comstock 1850

Scissors

"Many instruments in common use are on the principle of this kind of lever. Scissors, consists of two…

"The screw is the sixth and last simple mechanical power. It may be consdered as a modification of the inclined plane, of as a winding wedge." -Comstock 1850

Screw

"The screw is the sixth and last simple mechanical power. It may be consdered as a modification of the…

This diagram shows a hand gesture that represents a simple affirmation.

Simple Affirmation

This diagram shows a hand gesture that represents a simple affirmation.

"...to be cut in half by this plane (the twinned plane, reference Twinned Crystal of Gypsum) and one portion to be rotated through 180 degrees about the normal to the same plane. Described as being twinned on the plane." -The Encyclopedia Britannica 1910

Simple Crystal of Gypsum

"...to be cut in half by this plane (the twinned plane, reference Twinned Crystal of Gypsum) and one…

"Any rod, or bar, which is used in raising a weight, or surmounting a resistance, by being placed on a fulcrum, or prop, becomes a lever." -Comstock 1850

Simple Lever

"Any rod, or bar, which is used in raising a weight, or surmounting a resistance, by being placed on…

"Suppose that A is the lever, B the fulcrum, D the weight to be raised, and C the power. Let D by considered three times as heavy as C, and the fulcrum three times as far from C as it is from D; then the weight and power will exactly balance each other out." -Comstock 1850

Simple lever system

"Suppose that A is the lever, B the fulcrum, D the weight to be raised, and C the power. Let D by considered…

"Suppose the weight, B to be sixteen pounds and suppose the fulrum to be placed so near it, as to be raised by the power A, of four pounds hanging equally distant from the fulcrum and the end of the lever. If now the power A be removed, and another of two pounds, C, be placed at te end of the lever, its force will be just equal to A, placed at the middle of the lever." -Comstock 1850

Simple Lever System

"Suppose the weight, B to be sixteen pounds and suppose the fulrum to be placed so near it, as to be…

"But let the fulcrum be moved along to the middle of the lever, with the weight of sixteen pounds still suspended to it, it would then take another weight of sixteen pounds, instead of two pounds, to balance it..." -Comstock 1850

Simple Lever System

"But let the fulcrum be moved along to the middle of the lever, with the weight of sixteen pounds still…

"A combination of all of the simple machines." -Comstock 1850

Combination of All of the Simple Machines

"A combination of all of the simple machines." -Comstock 1850

"...represents a simple pulley, with a single fixed wheel. In other forms of the machine, the wheel moves up and down with the weight." -Comstock 1850

Simple Pulley

"...represents a simple pulley, with a single fixed wheel. In other forms of the machine, the wheel…

"Two fixed pulleys used to raise W." -Comstock 1850

Simple Pulley

"Two fixed pulleys used to raise W." -Comstock 1850

"The steelyard is a kind of balance, which, though not so sensitive as the one being described above, answers very well for heavy bodies, and is conveniently carried, as it requires but a single weight, and may be held in the hand or suspended anywhere." —Quackenbos 1859

Steelyard

"The steelyard is a kind of balance, which, though not so sensitive as the one being described above,…

This diagram is of a simple table created from two barrels and a large plank of wood.

Simple barrel table

This diagram is of a simple table created from two barrels and a large plank of wood.

The Tunisian pistol tassel is a cord with a simple knot to keep the cord from ravelling-out.

Tunisian Pistol Tassel

The Tunisian pistol tassel is a cord with a simple knot to keep the cord from ravelling-out.

"The electric telegraph in its simplest form, consists of an electric circuit connecting he points between which telegraphic intercourse is established, a battery at each point, connected wih this circuit, and two instruments, one for transmitting and the other for receiving electric impluses by with arbitrary sign representing written language are produced." -Atkinson 1903

Simple Telegraph

"The electric telegraph in its simplest form, consists of an electric circuit connecting he points between…

"A simple telegraph consisting of two telephone receivers, two batteries, and two keys." -Avery 1895

Simple Telegraph

"A simple telegraph consisting of two telephone receivers, two batteries, and two keys." -Avery 1895

"A lever is an inflexible bar freely movable about a fixed axis called the fulcrum. If the power is between the weight and the fulcrum the lever is of the third class." — Avery, 1895

Third class lever

"A lever is an inflexible bar freely movable about a fixed axis called the fulcrum. If the power is…