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Project

3D Floor Plan

Floor plans show walls, windows, doors, and other features of a room or building. Architects and engineers use them to study spatial relationships and describe their designs. Typically, floor plans are rendered as two-dimensional drawings.In this…

Project

3D Skull Candy Mold

Whether preparing for Halloween or just a regular day, you can make skull-shaped edibles from this project's 3D candy mold. Like many molds, this one is a hollow container into which you can pour water or hot liquids, such as gelatin, chocolate, or…

Project

3D Spur Gear

A spur gear is a common toothed wheel that works with other wheels in a set to adjust the speed, power, or direction of a complex machine. It's found in many everyday devices, such as electric screwdrivers, washing machines, and mechanical clocks…

Project

3D Terrain Map

Terrain maps are physical models that give you an at-a-glance overview of landforms. Architects, builders, and engineers often use these types of maps to provide context to proposed building designs. In this project, you'll create a layered…

Project

3x3x3 LED Cube

LEDs (light-emitting diodes) are rectifying semiconductor devices that convert electrical energy into electromagnetic radiation. You can use these devices to create a 3-dimensional light display. LED cubes require some care and good soldering skills…

Project

Arduino Oscilloscope

An oscilloscope is a device that allows you to see an electronic signal so that it appears as a waveform. Traditional oscilloscopes work by amplifying a signal to control the position of a dot on the y-axis (vertical axis) of a cathode-ray tube…

Project

Jumbo Foam Glider

This project takes you through the steps to build, launch, and fly a foam glider in sustained and controlled flight. Control in flight is achieved by modifying the wind the glider flies through with a large cardboard sheet (paddle). If this is your…

Project

Levitation Machine

This project allows you to use electromagnetic levitation to suspend a globe of the world above a surface. The "globe" is actually a table tennis ball painted to look like a globe. Keeping it in place requires careful control of electrical current…

Project

Light and Temperature Logger

Environmental research often involves the use of data loggers to record data at regular intervals over a period of time. Most data loggers are based on digital processors, and can be fairly expensive, but you can build your own. This project uses a…

Project

Pulse Generator Circuits

A pulse generator circuit is an important building block for many electronic projects, such as the heart of a digital clock. Its purpose is basically to switch an output on and off for as long as the circuit is activated. Sometimes, these circuits…

Project

Text-Controlled RGB LED

A red, green, and blue (RGB) light-emitting diode (LED) is a useful electronic component that can produce visible light in a variety of colors. This is done by varying the intensity of the light output of the three different color LED elements (red,…

Project

Tumblewing Walkalong Glider

This project takes you through the steps to build, launch,and fly a paper airplane (glider) in sustained and controlled flight. Control in flight is achieved by modifying the wind the glider flies through with a large cardboard sheet or foam board…

Project

Ultralight Foam Glider

This project takes you through the steps to build, launch, and fly an ultralight foam glider in sustained and controlled flight. Controlled flight is achieved by modifying the wind the glider flies through with a large cardboard sheet, or paddle.The…

Project

Wind Lantern

In this project, you will build a small, vertical-axis wind turbine, or VAWT for short. VAWTs are not as efficient as their horizontal-axis cousins, but they are better suited to urban environments where wind can come from different…

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from article Thermionic power generator

Diagram of thermionic converter.

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from article Thermionic power generator

Motive diagrams of a thermionic converter operating in (a) ideal, (b) unignited, and (c) ignited modes.They give the spatial variation of the energy of an electron from emitter to collector. Here, φE and φC are emitter and collector work functions,…

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from article Thermionic power generator

Current density-voltage characteristics of a thermionic converter. VB is the barrier index; other symbols are as in Fig. 2.

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from article Chain drive

Roller chains. (a) Single-strand. (b) Triple-strand.

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from article Chain drive

Roller chain drive. (FMC Corp.)

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from article Chain drive

Engineering steel chain drive. (Rexnord Inc.)

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from article Chain drive

Inverted tooth/silent chain drive.

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from article Chain drive

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from article Z transform

Extraction of discrete-time sample values from a continuous signal.

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from article Lubricant

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from article Lubricant

Viscosity-temperature relationships indicated for additive-thickened multigrade oils. °C = (°F − 32)/1.8.

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from article Lubricant

Two examples of gear damage.

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from article Lubricant

Effect of dispersant on cleanliness. (a) Ordinary oil. (b) Oil containing dispersant additive.

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from article Lubricant

Useful temperature range of synthetic oils. °C = (°F − 32)/1.8.

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from article Lubricant

Electron micrographs showing (a) soap-thickened grease and (b) dye-thickened grease.

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from article Landing gear

Landing gear arrangements. (a) Tail-wheel arrangement. (b) Tricycle arrangement.

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from article Landing gear

Main-wheel bogie for the XB-70A aircraft. (After S. Pace, North American Valkyrie XB-70A, Aero Series vol. 30, Tab Books, 1984)

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from article Instrumentation amplifier

Strain-gage bridge which produces a small wanted signal on a large bias, connected to an instrumentation amplifier that responds only to the wanted signal. The amplifier symbol indicates that the differential gain is controlled, unlike that of an…

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from article Instrumentation amplifier

Instrumentation amplifier topologies. (a) Simple topology based on three operational amplifiers. (b) Improved topology used in a modern integrated-circuit instrumentation amplifier.

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from article Automatic gain control (AGC)

Block diagram of a typical automatic gain control (AGC) circuit. (From J. R. Smith, Modern Communication Circuits, 2d ed., WCB/McGraw-Hill, Boston, 1998)

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from article Hot-water heating system

One-pipe hot-water heating system.

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from article Hot-water heating system

Two-pipe reverse return system.

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from article Silver

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from article Mining

Long sections of underground mines. (a) Ore body developed by adits. (b) Ore body developed by a shaft. (c) Bottom of stope prepared for horizontal ore movement. (d) Bottom of stope prepared by cone-shaped openings for ore movement.

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from article Mining

Long and cross sections of drill rounds. (a) Typical stope round. (b) Burn-cut round (drift), the 0 holes are left uncharged. (c) Drift round with top draw cut. (d) V-cut shaft round. (e) Sump or bench shaft round. The order of firing follows the…

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from article Mining

Loading principles. (a) Load-haul-dump unit. (b–e) Types of loading action: (b) filling bucket by shovel action; (c) filling backhoe bucket; (d) slusher bucket transporting; (e) filling clamshell bucket. (f) Scraper and gravity loading. (g)…

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from article Mining

Sections showing various types of support. (a) Deformation caused by forces. (b) Bolted cross section of level. (c) Timbered cross section of level. (d) Support in stopes. (e) Mine-waste support. (f) Timber support.

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from article Mining

Simplified electrical distribution system for mining.

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from article Mining

Radial electrical distribution system for an underground mine.

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from article Mining

Electrical distribution system for a surface mine.

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from article Mining

Open-pit mine power system.

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from article Mining

Average geothermal gradients of various worldwide mining districts and effects of autocompression on air wet-bulb temperature (assumed surface tw = 64°F or 18°C, and δtw = 2.4°F/1000 ft or 4.4°C/1000 m), both as a function of depth below surface.…

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from article Mining

Horizontal ventilation plan for room-and-pillar mine in coal. (After H. L. Hartman, Mine Ventilation and Air Conditioning, 2d ed., p. 433, Wiley, 1982)

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from article Mining

Ventilation circuits. Letters designate airways. (a) Series circuit (after H. L. Hartman, Mine Ventilation and Air Conditioning, 2d ed., Wiley, p. 174, 1982). (b) Parallel circuit (After H. L. Hartman, Mine Ventilation and Air Conditioning, p. 128,…

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from article Mining

Fan and mine operating point.

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from article Mining

Ventilation system in a southwestern Pennsylvania coal mine, showing the location of the shafts and slopes, and mine development.

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from article Mining

Homestake Gold Mine, showing the three primary ventilation circuits and major airways.

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from article Mining

Area required to be illuminated around a scoop used as a loading machine. Distance X is the distance from the side of the machine to rib or sidewall of the mine opening and is variable. (After Proceedings of the 4th West Virginia University…

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from article Mining

Longwall illumination system showing area to be illuminated is from the face to the gob side of the travelway, which defines the path by which the miners operating the equipment move from one end of the longwall face to the other. Travelway A is…

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from article Mining

Pumping installation at a copper mine in Zambia. (Zambia Consolidated Copper Mines Ltd.)

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from article Mining

Dewatering through a mine shaft at a copper mine in Zambia. (Zambia Consolidated Copper Mines Ltd.)

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from article Mining

A quarry pit presents hazards from possible ground falls as well as massive equipment.

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from article Mining

At a coal mine rescue contest, a team member takes a gas reading as the team works through a hypothetical emergency.

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from article Mining

Hopper cars being loaded by a belt conveyor. (Burlington Northern, Inc.)

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from article Mining

A 16-ton (14.5-metric-ton) diesel locomotive with exhaust water scrubber for use in coal mines. (Brookville Locomotive Division of Pennbro)

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from article Mining

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from article Mining

A 72-in. (22-m) conveyor belt at the Caridad Mine, Nacozari, Sonora, Mexico.

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from article Mining

Sampling channel and chip channel in a zoned vein exposed at a mine face, with a sample from each zone.

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from article Mining

Cross section of vein sampled by drill holes (DH) from surface and underground sites.

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from article Mining

Longitudinal section of a vein deposit, with ore reserve classifications.

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from article Mining

Mineral supply process.

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from article Mining

Reclaimed and revegetated tailings pond.

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from article Mining

Artificial wetland for treating mine drainage.

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from article Sound field enhancement

Classification scheme for sound field enhancement systems.

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from article Sound field enhancement

A sound field enhancement system can generally be modeled as a matrix. The system uses microphones (M) and loudspeakers (L).

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from article Sound field enhancement

Basic signal paths of a sound field enhancement system showing an acoustic feedback channel from a loudspeaker back to a microphone.

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from article Sound field enhancement

Example of frequency response curves for a room with a feedback system. The upper curve shows response for loop gain setting close to oscillation; the lower curves shows response for gain settings of −5, −10, −15, −20 dB relative to this level.

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from article Semiconductor rectifier

Current-voltage characteristic of a commercially available 250-A silicon rectifier diode. Different voltage and current scales are used for positive and negative values.

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from article Semiconductor rectifier

Typical rectifier diode packages which allow heat dissipation and proper electrical contact. (General Electric Co.)

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from article Semiconductor rectifier

Rectifier circuits. (a) Waveform of single-phase ac input voltage, Vac, for both half-wave rectifier and full-wave rectifier circuits. (b) Half-wave rectifier circuit, showing rectification of input on the positive half-cycles to a pulsating dc…

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from article Semiconductor rectifier

Silicon controlled rectifier (SCR). (a) Four-layer structure. (b) Interconnected npn-pnp transistor model. (c) Preferred schematic symbol. (d) Current-voltage (I-V) characteristic. The switching path is followed when a voltage pulse is applied to…

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from article Semiconductor rectifier

Family of thyristor devices.

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from article Semiconductor rectifier

MOS-controlled thyristor. (a) Model as interconnected pnp and npn transistors gated by an NMOSFET (negative metal-oxide-semiconductor field-effect transistor). (b) Schematic symbol.

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from article Dielectric measurements

High-frequency form of the Schering bridge. D = detector; S = switch.

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from article Dielectric measurements

High-voltage form of the Schering bridge.

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from article Dielectric measurements

Transformer bridge.

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from article Dielectric measurements

Hartshorn and Ward basic circuit.

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from article Dielectric measurements

TE01n resonator. The resonator can be brought into resonance by moving the piston or by changing the frequency.

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from article Dielectric measurements

Open resonator. The microwave radiation is usually introduced via waveguides through holes in the center of the curved mirror.

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from article Dielectric measurements

Coaxial probe.

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from article Dielectric measurements

Interferometer arrangement with specimen at A for conventional Fourier transform spectroscopy and at B for dispersive Fourier transform spectroscopy.

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from article Beam-column

Loadings that create beam-column effects. (a) Eccentrically applied axial load. (b) Concentrically applied axial load and end moment. (c) Axial load and transverse load or loads between the two ends.

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from article Beam-column

Frame-type structure with one beam and four columns acting as beam-columns.

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from article Map projections

Oblique Mercator projection on a cylinder. (After American Oxford Atlas, Oxford, 1951)

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from article Map projections

Conical projection, based on origin 45°N, 10°E. (After American Oxford Atlas, Oxford, 1951)

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from article Map projections

Azimuthal projections with tangent planes have been raised above the sphere surface. (a) Polar azimuthal. (b) Oblique azimuthal. (After American Oxford Atlas, Oxford, 1951)

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from article Map projections

Four pseudocylindrical projections. (University of Wisconsin-Madison Cartographic Laboratory)

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from article Map projections

The property of equivalence is not maintained on the Mercator projection, making Greenland and South America appear similar in size. The inset map shows that South America is actually about 15 times larger than Greenland.

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from article Explosive forming

Five methods of explosive forming. (a) Shaped charge and parabolic reflector. Shock and pressure are motive power. Reflector and charge must be shaped to direct explosive force toward workpiece. (b) Flat high explosive is simply placed on top of…

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from article Explosive forming

Typical metal shapes produced by explosive forming. Note weld in bowl. (National Northern Corp.)

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from article Plasticity

Plot of stress versus strain to fracture for a typical metal alloy that is deformed using a tensile load.

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from article Plasticity

Plot of stress versus strain to fracture for a typical plastic polymeric material that is deformed using a tensile load.

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from article Zone refining

Zone refining. (a) Passage of a molten zone along the material to be purified. (b) Effect of 1, 5, and 10 zone passes on the impurity distribution along the material.

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from article Zone refining

Industrial techniques. (a) Zone refining on a water-cooled hearth. (b) Electron-beam zone-refining arrangement. (After R. F. Bunshah, ed., Techniques of Metals Research, vol. 1, John Wiley and Sons, 1968)

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from article Brittleness

Energy absorbed during fracture versus temperature. Brittle materials absorb much lower energy during fracture than ductile or tough materials. Some materials exhibit a brittle-to-ductile transition that depends on the test temperature.

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from article Brittleness

Scanning electron microscope image of a transgranular cleavage fracture surface in a steel tested at a temperature below its brittle-to-ductile transition. The arrow indicates the likely fracture initiation site.

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6,524 results

3D Floor Plan

3D Skull Candy Mold

3D Spur Gear

3D Terrain Map

3x3x3 LED Cube

Arduino Oscilloscope

Jumbo Foam Glider

Levitation Machine

Light and Temperature Logger

Pulse Generator Circuits

Text-Controlled RGB LED

Tumblewing Walkalong Glider

Ultralight Foam Glider

Wind Lantern

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