"Nervous System of the Aplysia, a Gasteropodous Mollusc: c, cerebral ganglia; g, thoracle or sub-aesophageal ganglia; o, nervous collar surrounding the aesophagus; l, labial ganglia; v, visceral ganglion." — Chambers, 1881

Aplysia Nervous System

"Nervous System of the Aplysia, a Gasteropodous Mollusc: c, cerebral ganglia; g, thoracle or sub-aesophageal…

Wiring diagram showing Remy ignition and Bijur starting and lighting systems on 6-16, 8-16, 6-17 and 8-17 Apperson cars.

Apperson

Wiring diagram showing Remy ignition and Bijur starting and lighting systems on 6-16, 8-16, 6-17 and…

"Diagram of the arterial system of A, Scorpio, and B, Limulus. The Roman numerals indicate the body somites and the two figures are adjusted for comparison. ce, Cerebral arteries; sp, supra-spinal or medullary artery; c, caudal artery; l, lateral anastomotic artery of Limulus. The figure B also shows the peculiar neural investiture formed by the cerebral arteries in Limulus and the derivation from this of the arteries to the limbs, III, IV, VI, whereas in Scorpio the latter have a seperate origin from the anterior aorta." — The Encyclopedia Britannica, 1910

Arterial System

"Diagram of the arterial system of A, Scorpio, and B, Limulus. The Roman numerals indicate the body…

Wiring diagram for the Delco Single-Unit system on the Auburn Six-40.

Auburn Six-40

Wiring diagram for the Delco Single-Unit system on the Auburn Six-40.

Wiring diagram for auto-lite system on Chevrolet (Royal Mail and Baby Grand Models) showing two-wire connections.

Auto-Lite System

Wiring diagram for auto-lite system on Chevrolet (Royal Mail and Baby Grand Models) showing two-wire…

Bijur system (two-wire) installed on the Jeffery Chesterfield Six.

Bijur

Bijur system (two-wire) installed on the Jeffery Chesterfield Six.

Wiring diagram of Bijur System for Packard "Twelves."

Bijur System

Wiring diagram of Bijur System for Packard "Twelves."

Bicycle brake systems are used to slow down or brake a bicycle. There have been various types through history, and several are still in use today.

Bicycle Chain Brake System

Bicycle brake systems are used to slow down or brake a bicycle. There have been various types through…

"The center of gravity, in any body or system of bodies is that point upon which the body, or system of bodies, acted upn only by gravity will balance itself in all positions." -Comstock 1850

Center of Gravity

"The center of gravity, in any body or system of bodies is that point upon which the body, or system…

An ideal view of the circulation in the lungs and system.

Circulation

An ideal view of the circulation in the lungs and system.

"Showing the Relations of the Stomach, Liver, Intestines, Spleen, and other Organs of the Abdomen. <em>A</em>duodenum</em>; <em>B</em>, upper end of the small intestine; <em>C</em>, lower end of the small intestine; <em>D</em>, caecum; <em>E</em>, bladder. The liver and stomach are drawn up and portions of the lower intesting have been cut away." &mdash; Blaisedell, 1904

Digestive system

"Showing the Relations of the Stomach, Liver, Intestines, Spleen, and other Organs of the Abdomen. Aduodenum;…

"Electric-bell indicator for fishing [when installing home wiring systems]." &mdash;Croft 1915

Electric-bell Indicator

"Electric-bell indicator for fishing [when installing home wiring systems]." —Croft 1915

"The elliptical circle being supposed to be the Earth's orbit, with the Sun, S, in one of the foci. Now the spaces, 1, 2, 3, etc., though of different shapes, are of the same dimensions, or contain the same quantity of surface. The Earth, we have already seen, in its journey round the Sun, describes an ellipse, and moves more rapidly in one part of its orbit than in another. But whatever may be its actual velocity, its comparative motion is through equal areas in equal times. Thus its center passes from E to C, and from C to A, in the same period of time, and so of all the other divisions marked in the figure." &mdash;Comstock, 1850

Elliptical Orbit

"The elliptical circle being supposed to be the Earth's orbit, with the Sun, S, in one of the foci.…

"Digestive system of the common Fowl. o, Gullet; c, Crop; p, Proventriculus; g, Gizzard; sm, Small intestine; k, Intestinal caeca; l, Large intestine; cl, Cloaca." &mdash; Winston's Encyclopedia, 1919

Fowl Digestive System

"Digestive system of the common Fowl. o, Gullet; c, Crop; p, Proventriculus; g, Gizzard; sm, Small intestine;…

The skeletal structure of a gorilla.

Gorilla Skeleton

The skeletal structure of a gorilla.

Diagram of a high-tension ignition system. A is the source of current, usually a batter in earlier days, as indicated by the conventional sign, placed in a primary circuit that also includes the contact maker C, the primary winding of the coil B, and the vibrator G.

High-Tension Ignition System

Diagram of a high-tension ignition system. A is the source of current, usually a batter in earlier days,…

Auto-lite ignition, starting, and lighting system on Briscoe 1917 motor cars.

Ignition

Auto-lite ignition, starting, and lighting system on Briscoe 1917 motor cars.

Diagram of a low-tension ignition system. A is the battery, B is a spark coil, and C, D, and E are the elements of a make-and-break device that is mechanically actuated at regular intervals by the motor itself to produce the sparks within the cylinder.

Ignition System

Diagram of a low-tension ignition system. A is the battery, B is a spark coil, and C, D, and E are the…

Four-cylinder low-tension ignition system.

Ignition System

Four-cylinder low-tension ignition system.

A diagram showing hydraulic analogy of ignition system.

Ignition System

A diagram showing hydraulic analogy of ignition system.

Wiring diagram of the Bosch Duplex Ignition System.

Ignition System

Wiring diagram of the Bosch Duplex Ignition System.

Wiring diagram of the Ford Ignition System.

Ignition System

Wiring diagram of the Ford Ignition System.

A wiring diagram for Connecticut Ignition System.

Ignition System

A wiring diagram for Connecticut Ignition System.

Essentials of battery ignition system.

Ignition System

Essentials of battery ignition system.

"A crystal form does not necessarily make a solid figure. One such an example is this, of the Monoclinic System.

Crystal of the monoclinic system

"A crystal form does not necessarily make a solid figure. One such an example is this, of the Monoclinic…

The superficial muscles in a horse.

Horse Muscles

The superficial muscles in a horse.

"Diagram illustrating the General Arrangement of the Nervous System. (posterior view.)" &mdash; Blaisedell, 1904

Nervous system

"Diagram illustrating the General Arrangement of the Nervous System. (posterior view.)" — Blaisedell,…

"Scheme showing the essential relations of the parts of a nervous system: 1, the sensory end organ (epithelial); 2, afferent nerve tract; 3, central nervous cells (ganglia); 4, efferent nerves, leading to 5, muscle, gland, etc. g, ganglion cells; gl., gland; m, muscle fibre; n.f., nerve fibre; s.e., sensory epithelium." &mdash; Galloway

Nervous System

"Scheme showing the essential relations of the parts of a nervous system: 1, the sensory end organ (epithelial);…

"Part of the nervous system viewed in front." —Davison, 1910

Nervous System

"Part of the nervous system viewed in front." —Davison, 1910

Auto-lite starting and lighting system on the Overland, models 85 and 85-B.

Overland

Auto-lite starting and lighting system on the Overland, models 85 and 85-B.

Auto-lite starting and lighting system on Overland Light Fours, model 90-4.

Overland

Auto-lite starting and lighting system on Overland Light Fours, model 90-4.

"Relative distance of the Planets. Having now given a short account of each planet composing the solar system, the relative situation of their several orbits, with the exception of those of the Asteroids, are shown in this figure. The orbits are marked by the signs of each planet, of which the first, or that nearest the Sun, is Mercury, the next Venus, the third the Earth, the fourth Mars then come those of the Asteroids, then Jupiter, then Saturn and lastly Herschel." &mdash;Comstock, 1850

Planet Distance

"Relative distance of the Planets. Having now given a short account of each planet composing the solar…

"Circular Motion of the Planets." &mdash;Comstock, 1850

Planet Motion

"Circular Motion of the Planets." —Comstock, 1850

"Elliptical Orbits.&mdash;It has been supposed that the Sun's attraction, which constitutes the Earth's gravity, was at all times equal, or that the Earth was at an equal distance from the Sun, in all parts of its orbit." &mdash;Comstock, 1850

Planet Motion

"Elliptical Orbits.—It has been supposed that the Sun's attraction, which constitutes the Earth's…

"The comparative dimensions of the planets." &mdash;Comstock, 1850

Planet Sizes

"The comparative dimensions of the planets." —Comstock, 1850

A diagram showing the planets of our solar system.

Planets

A diagram showing the planets of our solar system.

Orthogonal projection of a closed plane-faced polyhedron.

Polyhedron

Orthogonal projection of a closed plane-faced polyhedron.

Orthogonal projection of a closed plane-faced polyhedron.

Polyhedron

Orthogonal projection of a closed plane-faced polyhedron.

"A horse without machinery can not lift a weight; but he does it readily with the aid of the simple apparatus shown [here].." &mdash;Quackenbos 1859

Pulley System

"A horse without machinery can not lift a weight; but he does it readily with the aid of the simple…

"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…

Wiring diagram for Delco Single-Unit Single-Wire System.

Single-Wire System

Wiring diagram for Delco Single-Unit Single-Wire System.

Auto-lite single-wire starting and lighting system for Chevrolet 490 cars.

Starting System

Auto-lite single-wire starting and lighting system for Chevrolet 490 cars.

Auto-lite starting and lighting system on the Chevrolet, Model F.

Starting System

Auto-lite starting and lighting system on the Chevrolet, Model F.

Auto-lite starting and lighting system on the Wolverine "349."

Starting System

Auto-lite starting and lighting system on the Wolverine "349."

"System of Wheels.&mdash;As the wheel and axle is only a modification of the simple lever, so a system of wheels acting on each other, and transmitting the power to the resistance, is only another form of the compound lever. The first wheel a, by means of the teeth, or cogs, around its axle, moved the second wheel, b, with a force equal to that of a lever, the long arm of which extends from the center to the circumference of the wheel, where the power p is suspended, and the short arm from the same center to the ends of the cogs. The dotted line c, passing through the center of the wheel a, shows the position of the lever, as the wheel now stands." &mdash;Comstock, 1850

System of Wheels

"System of Wheels.—As the wheel and axle is only a modification of the simple lever, so a system…

"A complete telegraph system, displaying batteries, keys, receivers, relays and local batteries on both ends." -Avery 1895

Complete Telegraph System

"A complete telegraph system, displaying batteries, keys, receivers, relays and local batteries on both…

The valve closet has a valve or flap at the exit of the bowl with a water-tight seal to retain a pool of water in the pan. When the toilet is flushed, the valve is opened and the water in the pan flows rapidly out of the bowl into the drains, carrying the waste with it.

Water Valve Closet

The valve closet has a valve or flap at the exit of the bowl with a water-tight seal to retain a pool…