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Cutaway view of an alkaline-manganese dioxide power cell.

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.

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.

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

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.

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

Typical gasoline engine cooling system.

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

Basic components of an electrochemical cell.

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

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

Typical gasoline engine lubrication system.

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

Zinc-carbon 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

Zinc chloride battery, illustration

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

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

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

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

Proton exchange membrane (PEM) fuel cell.

A grid-connected solar cell system.

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.

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

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

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.

Fission bomb designs

Thermonuclear warhead

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

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

Rising air in an unstable atmosphere

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

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

Vegetation profile of a temperate deciduous forest.

Vegetation profile of a grassland.

Cross section of a typical bomb calorimeter.

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

Transverse section of an artery.

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

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

Types of faulting in tectonic earthquakes.

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

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

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

Zinc chloride battery, illustration

Zinc chloride battery, illustration

Zinc chloride battery, illustration

Zinc chloride battery, illustration

Zinc chloride battery, illustration

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

Vegetation profile of a desert.

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 of a mammalian muscle spindle.

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.

The components of a scanning electron microscope (SEM).

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

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.

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.

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

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

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.

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

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

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.

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

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 diffusion of water across a semipermeable membrane.

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.

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

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

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

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

Displacements in the Earth in four types of free vibrations.

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

Bohr atomic model

The components of a transmission electron microscope (TEM).

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.

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

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

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

Muscle structure, artwork

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

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

Polar covalent bond

Ionic bond

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.

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

Chemical composition of nicotine, conceptual image

Human muscle structure, artwork

Animal cell structure

Mechanism of enzyme action, illustration

Speedometer

Spring balance

Electrolysis, illustration

Atmospheric pressure glass trick, illustration

Atmospheric pressure glass trick, illustration

Internal structure of Mercury, illustration

Internal structure of Mercury, illustration

Internal structure of Earth, illustration

Bacterial manganese catalase molecule

Manganese superoxide dismutase

Riboswitch sensing manganese ions

Male urogenital system, artwork

Female reproductive system, artwork

Goose barnacle anatomy, artwork

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.

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

Height of space from Earth, illustration

Height of space from Earth, illustration

Height of space from Earth, illustration

Height of space from Earth, illustration

Drinking through a straw, illustration

Drinking through a straw, illustration

Layers of the ionosphere

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.

Operating principle of a parallel-flow heat exchanger.

Camera with inverted image, cutaway artwork

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

Electrolysis of water, illustration

Hydroiodic acid chemical compound molecule

Perchloric acid inorganic compound molecule

Phosphoric acid chemical compound

Electronic semiconductor integrated component, vector illustration

Manganese, atomic structure

懐中電灯と乾電池

Mechanics of respiration, artwork

Osteoarthritis of the knee, artwork

Moon interior

Compound pier

アルカリ乾電池

アルカリ乾電池

アルカリ乾電池

Oxygen molecule, illustration

Cross section of a crystal microphone.

Pluto and the Kuiper belt

MRI検査 頭部

MRI検査 人体

MRI検査 人体

Stroke causes, artwork

Laser eye surgery, artwork

Laser eye surgery, artwork

Human olfactory region, artwork

Human olfactory region, artwork

Knee anatomy, artwork

Endometrial cancer, artwork

Brain haemorrhage, artwork

Shoulder joint, artwork

Cervical conization, artwork

Female urinary system, artwork

Synapse, artwork

Asthma pathology, artwork

Eye anatomy,artwork

Kidney anatomy, artwork

Narrowed blood vessel, artwork

Narrowed blood vessel, artwork

Narrowed blood vessel, artwork

Bone structure, artwork

Breast anatomy, artwork

Vascular disease progression, artwork

矢印　循環　輪

矢印　循環　輪

矢印　循環　輪

Pythagorean theorem, illustration