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

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

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

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

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

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

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

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

Basic components of an electrochemical cell.

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

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

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

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

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

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

Cross section of a V-type engine.

Diesel engine equipped with a precombustion chamber.

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

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

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

Fission bomb designs

Thermonuclear warhead

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

Typical gasoline engine lubrication system.

The analysis of sound frequencies by the basilar membrane.

Cutaway view of an alkaline-manganese dioxide power cell.

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

Transverse section of an artery.

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

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

Rising air in an unstable atmosphere

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

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

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

Diagram of an artificial pacemaker

Bohr atomic model

Electron shell

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

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.

Vegetation profile of a temperate deciduous forest.

Vegetation profile of a desert.

Vegetation profile of tropical mountain lands.

Cross section of a typical bomb calorimeter.

The process of cell division by mitosis.

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

Human arterial supply and venous drainage of the organs.

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

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

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.

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

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

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.

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

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

The components of a scanning electron microscope (SEM).

The components of a transmission electron microscope (TEM).

The diffusion of water across a semipermeable membrane.

The diffusion of potassium cations across a semipermeable membrane.

Changes in ion permeance underlying the action potential.

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

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

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

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

Diagram of a mammalian muscle spindle.

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

A grid-connected solar cell system.

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

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

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.

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

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

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

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

Height of space from Earth, illustration

Polar covalent bond

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

The weather model of meteorologist Edward Lorenz.

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

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.

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

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

Female reproductive system, artwork

Gender characteristics, artwork

Muscle structure, artwork

Protein synthesis, artwork

Gate control theory of pain, artwork

Cardiac stress test, artwork

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

Typical gasoline engine cooling system.

Proton exchange membrane (PEM) fuel cell.

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

Viral transfer of bacterial DNA, artwork

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

Coriolis force

Compton effect

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

Vegetation profile of a grassland.

Types of faulting in tectonic earthquakes.

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

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.

Circuit breaker, diagram

Residual current circuit breaker, diagram

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

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

Electromagnet, illustration

Internal structure of Mercury, illustration

Internal structure of Mercury, illustration

Internal structure of Earth, illustration

Osteoarthritis of the knee, artwork

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

Height of space from Earth, illustration

Height of space from Earth, illustration

Height of space from Earth, illustration

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

Speedometer

Spring balance

Displacements in the Earth in four types of free vibrations.

Wormhole through hyperspace, artwork

Male urogenital system, artwork

Electromagnetic coil and core, illustration

Electromagnetic coil and core, illustration

Electromagnetic coil and core, illustration

Electromagnetic coil and core, illustration

Electromagnetic coil and core, illustration

Electromagnetic coil and core, illustration

Electromagnetic coil and core, illustration

Electromagnetic coil and core, illustration

Magnetic field of electromagnetic coil and core

Magnetic field of electromagnetic coil and core

Magnetic field of electromagnetic coil and core

Demagnetizing a metal object with a solenoid, illustration

Demagnetizing a metal object with a solenoid, illustration

Demagnetizing a metal object with a solenoid, illustration

Demagnetizing a metal object with a solenoid, illustration

Magnetizing a metal object with a solenoid, illustration

Magnetizing a metal object with a solenoid, illustration

Magnetizing a metal object with a solenoid, illustration

Magnetizing a metal object with a solenoid, illustration

Right-hand rule for wires, illustration

Right-hand rule for wires, illustration

Right-hand rule for wires, illustration

Right-hand rule for wires, illustration

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

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

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

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

Cross section of a crystal microphone.

Pluto and the Kuiper belt

矢印　循環　輪

矢印　循環　輪

矢印　循環　輪

Electromagnet, illustration

Electromagnet, illustration

Electric bell mechanism, diagram

Electric bell mechanism, diagram

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

Correct computer use position, artwork

Convex and concave lenses, diagram

Mechanism of enzyme action, illustration

Pelvic inflammatory disease, artwork

Pleural effusion treatment, artwork

Male Down's syndrome karyotype, artwork

Spina bifida, artwork

Common wart, artwork

Laser eye surgery, artwork

Laser eye surgery, artwork

Human stomach, artwork

Human olfactory region, artwork

Human olfactory region, artwork

Human olfactory system, artwork

Liver and pancreas, artwork

Endometrial cancer, artwork

Human sex hormone production sites

Compression fracture, artwork

Dupuytren's contracture,artwork

Male urinary system, artwork

Kidney stone, artwork

Brain haemorrhage, artwork

Tear production, artwork

Shoulder joint, artwork

Situs inversus, artwork

Brain and spinal cord, artwork

Cervical conization, artwork

Female urinary system, artwork

Human muscle structure, artwork

Shoulder muscles, artwork

Heart, artwork

Asthma pathology, artwork

Eye anatomy,artwork

Kidney anatomy, artwork

Narrowed blood vessel, artwork

Narrowed blood vessel, artwork

Narrowed blood vessel, artwork