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Cutaway view of a typical construction of a miniature power cell, as in a zinc-silver oxide or zinc-mercuric oxide system.

Modern version of the Leclanche cell. This heavy-duty zinc-carbon primary battery is a dry cell with an immobilized electrolyte.

Cutaway view of an alkaline-manganese dioxide power cell.

Georges Leclanche's dry cell and its later variations, zinc chloride and alkaline cells, are batteries commonly used worldwide.

A fuel cell (actually a group of cells) has essentially the same kinds of components as a battery.

The gasoline carburetor is a device that introduces fuel into the airstream as it flows into the engine.

Nickel (hydroxide)-cadmium cell of “jelly roll” construction. This rechargable battery is commonly used in portable devices.

Cross section of a V-type engine.

Diesel engine equipped with a precombustion chamber.

Typical gasoline engine cooling system.

An internal-combustion engine goes through four strokes: intake, compression, combustion (power), and exhaust.

Blower-scavenged, two-stroke-cycle engine with uniflow scavenging, displaying both upstroke and downstroke.

The four strokes of a four-stroke cycle engine - intake, compression, power, and exhaust. Only the intake stroke delivers power.

Automotive-type lead-acid battery, a storage battery that holds its charge for a long time and can be recharged.

Elements of a magnetron, used to generate power for radar systems, microwave ovens, plasma screens, and linear accelerators.

Diagram of a two-cavity klystron, used as an amplifier and RF signal source at microwave frequencies, and also as an oscillator.

A cutaway view shows how light passes through the lenses and prisms of binoculars.

The sequence of events in a four-stroke diesel engine involves a single intake valve, fuel-injection nozzle, and exhaust valve.

Gyrotron, electrons from the cathode acquire cyclotron rotation in the cavity.

Solar cells, whether used in a central power station, a satellite, or a calculator, have the same basic structure.

Basic components of an electrochemical cell.

Typical gasoline engine lubrication system.

Four types of gasoline engines: opposed-piston engine, rotary engine, in-line engine, and V-type engine.

Elements of the traveling-wave tube (TWT), used to amplify microwave signals over broad bandwidths.

A grid-connected solar cell system.

A tokamak is a toroidal magnetic confinement system used as a method of achieving fusion energy.

Proton exchange membrane (PEM) fuel cell.

An electron (e) in a solar cell interacting with light and dissipating excess energy is analogous to a child playing on a slide.

Vegetation profile of a grassland.

Vegetation profile of a temperate deciduous forest.

Cross section of a typical bomb calorimeter.

Schematic drawing of the structure of a typical bacterial cell of the bacillus type.

U.S. space shuttle, composed of a winged orbiter, an external liquid-propellant tank, and two solid-fuel rocket boosters.

Fission bomb designs

Thermonuclear warhead

The Apollo program: the Saturn V launch vehicle and configurations of the spacecraft modules at launch and during the journey.

U.S. space station Skylab (occupied 1973-74), shown with docked Apollo Command and Service modules.

The Michelson interferometer measures the effect on the speed of light of the motion of the ether through which light travels.

Rising air in an unstable atmosphere

Zonation of the ocean. Note that in the littoral zone the water is at the high-tide mark.

The endoplasmic reticulum plays an important role in the biosynthesis, processing, and transport of proteins and lipids.

Transverse section of an artery.

Types of faulting in tectonic earthquakes.

Seismic ray types in Earth's interior from earthquake at F.

Vegetation profile of a desert.

Diagram of a mammalian muscle spindle.

The components of a scanning electron microscope (SEM).

Annual circulation patterns in a dimictic lake: stratification in the summer and complete overturn in the autumn and spring.

Four main types of estuaries: A) salt wedge estuary, B) partially mixed estuary, C) vertically homogeneous estuary, D) fjord.

Comparison of a normal heart to one with a ventricular septal defect

Diagram demonstrating the difference between a normal heart and a heart with an atrial septal defect

Diagram showing a healthy heart valve compared with a diseased heart valve and an artificial heart valve.

Generated by an undersea earthquake, a tsunami may propagate over open ocean waters before cresting and inundating a coastline.

The stages in the evolution of a wave (frontal) cyclone.

The diffusion of water across a semipermeable membrane.

Zinc chloride battery, illustration

Zinc chloride battery, illustration

Zinc chloride battery, illustration

Zinc chloride battery, illustration

Zinc chloride battery, illustration

Zinc chloride battery, illustration

Zinc chloride battery, illustration

The steps involved in the engineering of a recombinant DNA molecule.

Diagram of a wave system depicting typical divergence and convergence distributions for non-tilting and tilting systems.

General patterns of atmospheric circulation over an idealized Earth with a uniform surface and the actual Earth.

Three types of natural selection, showing the effects of each on the distribution of phenotypes within a population.

Basic characteristics of orbits in which a satellite can be placed around Earth, categorized by inclination, shape and altitude.

Two types of pressure gauge: the U-tube manometer and the Bourdon-tube gauge.

Pay-off matrix showing bourgeois, or mixed attack/retreat behaviour, as the most stable strategy for a population.

Vegetation profile of tropical mountain lands.

The analysis of sound frequencies by the basilar membrane.

The two sensory organs of balance: the cristae of the semicircular ducts and the maculae of the utricle and saccule.

Diagram depicting the process of atoll formation. Atolls are formed from the remnant parts of sinking volcanic islands.

Vegetation profile of a boreal forest. The tree layer consists mainly of conifers, and mosses are the predominant ground cover.

Coriolis force

Electron shell

Compton effect

The process of cell division by mitosis.

Stages in the process of meiosis, cell division among sexually reproducing organisms.

Receptor-mediated endocytosis enables cells to ingest molecules such as protein that are necessary for normal cell functioning.

Human arterial supply and venous drainage of the organs.

Average exchange of energy between the surface, atmosphere, and space, as percentages of incident solar radiation.

Horizontal divergence and convergence patterns associated with the polar-front jet.

The onset and retreat of the West African monsoon with respect to the timing of the direct rays of the sun.

Electromagnetic spectrum. The visible range (shaded portion) is shown enlarged on the right.

Evolutionary history of the globin genes. The dots indicate the duplication of ancestral genes, giving rise to new gene lineage.

The Hardy-Weinberg Law applied to two alleles.

The journey of the Galileo spacecraft to Jupiter, highlighting major observations along the trajectory, as well as their dates.

Apollo mission profile for a lunar landing and return, outlining the various stages along the mission.

The components of a transmission electron microscope (TEM).

The diffusion of potassium cations across a semipermeable membrane.

Diagram of a human uterus during the fourth month of pregnancy.

The surface reflectance differences between a pre-agricultural (forest) and a modern agricultural (patchwork heating) landscape.

Electrical conduction in the heart in healthy individuals is controlled by pacemaker cells in the sinoatrial node.

Earth's prebiotic and modern atmosphere

Phylogeny based on differences in the protein sequence of cytochrome c in organisms ranging from Neurospora mold to humans.

Diagram of an artificial pacemaker

A heart-lung machine diverts blood from the body to an oxygenator, which removes CO2, adds O2, and returns the blood to the body

Displacements in the Earth in four types of free vibrations.

Cross section comparing the left ventricular wall of normal heart to a left ventricular wall that has experienced hypertrophy.

Bohr atomic model

Changes in ion permeance underlying the action potential.

Theoretical depiction of the movement of tectonic plates across Earth's surface.

Theoretical diagram showing the effects of an advancing tectonic plate on other adjacent, but stationary, tectonic plates.

Differentiation of the external genitalia in the human embryo and fetus.

Annual temperature and precipitation patterns for several locations with different climatic conditions.

Light waves matching the orientation of the molecules of a polarizing filter are absorbed, reducing the intensity of the light.

Seasons change because more direct sunlight falls on some parts of Earth than others at different times of the year.

Muscle structure, artwork

Space station Mir, after its completion in 1996, with the launch dates of each modular component shown.

Polar covalent bond

The weather model of meteorologist Edward Lorenz.

The artery wall and the ultrastructure of the smooth muscle cells within it.

Zinc-carbon battery, illustration

Uniformly accelerated motion; s = speed, a = acceleration, t = time, and v = velocity.

In Ptolemy's geocentric model of the universe, the Sun, Moon, and each planet orbit a stationary Earth.

Approaching the speed of light, an object appears shorter, with a longer time interval, relative to its intervals when at rest.

Wet scrubber using a limestone slurry to remove sulfur dioxide from flue gas.

Operating principle of a parallel-flow heat exchanger.

Zinc oxide nanoparticles, illustration

Calcium oxide molecule, illustration

Nitrous oxide chemical compound molecule

Chemical composition of nicotine, conceptual image

Internal structure of Mercury, illustration

Internal structure of Mercury, illustration

Internal structure of Earth, illustration

Speedometer

Spring balance

Male urogenital system, artwork

Female reproductive system, artwork

Oxygen molecule, illustration

Height of space from Earth, illustration

The 4-D space-time continuum is distorted in the vicinity of any mass, depending on the mass and the distance from the mass.

Cardiac stress test, artwork

Electric lamp and circuit symbol, illustration

Circuit board, illustration

Ionic bond

Zinc chloride battery, illustration

Zinc chloride battery, illustration

Zinc chloride battery, illustration

Zinc chloride battery, illustration

Zinc chloride battery, illustration

Drinking through a straw, illustration

Drinking through a straw, illustration

The relationship between hot springs and epithermal veins.

Weathering frees heavy minerals from their matrix, washing them down slope where flowing water forms them into placer deposits.

An active-matrix thin-film transistor (TFT) liquid crystal display. A TFT is associated with each pixel of the display screen.

Cross section of a crystal microphone.

When monochromatic light passing through a single slit illuminates a screen, a characteristic diffraction pattern is observed.

When monochromatic light passes through two narrow slits to illuminate a screen, it creates a pattern of bright and dark bands.

人工衛星　上向き　アイソメトリック

人工衛星　アイソメトリック

Mechanism of enzyme action, illustration

Human muscle structure, artwork

Animal cell structure

Mechanics of respiration, artwork

Osteoarthritis of the knee, artwork

Electronic semiconductor integrated component, vector illustration

Electrostatic precipitator, a common particle collection device at fossil-fuel power-generating stations.

Pythagorean theorem, illustration

Atmospheric pressure glass trick, illustration

Atmospheric pressure glass trick, illustration

Light-emitting diode and circuit symbol, illustration

Electrolytic capacitor and circuit symbol, illustration

Electric motor and circuit symbol, illustration

Electric buzzer and circuit symbol, illustration

Simple lighting circuit, illustration

Simple lighting circuit, illustration

Two lamps connected in parallel, illustration

Wormhole through hyperspace, artwork

Gender characteristics, artwork

Protein synthesis, artwork

Gate control theory of pain, artwork

Moon interior

Electrocardiogram of the alternating contractions during one heartbeat and a diagram of the heart's impulse-conducting system.

Pluto and the Kuiper belt

Height of space from Earth, illustration

Height of space from Earth, illustration

Height of space from Earth, illustration

Moving coil loudspeaker, diagram

Moving-coil microphone, diagram

Layers of the ionosphere

Ozone molecule, illustration

Water molecule, illustration

Goose barnacle anatomy, artwork

Combination of shapes and alphabet

Fluorine molecule, illustration

Camera with inverted image, cutaway artwork

Hydrogen molecule, illustration

Relationships of endocrine glands, from the pituitary-hypothalamus system to the vertebrate endocrine glands and their hormones.

Rheostat resistor, illustration

Electromagnet, illustration

Motor effect, illustration

Nitric oxide synthase oxygenase

Pressure exerted by a sharp knife, illustration

Pressure exerted by a sharp knife, illustration

Pressure exerted by finger pushing a nail into wood, illustr

Pressure exerted by finger pushing a nail into wood, illustr

Shadow cast by a large light source, illustration

Shadow cast by a small light source, illustration