Mechanically powered flashlight

A Haitian boy turns the crank on his crank-powered flashlight radio. Mechanically powered flashlights were distributed by aid organizations to survivors of the 2010 Haiti earthquake since electric power was lost for a long period.
A linear induction flashlight is charged by shaking it along its long axis, causing a magnet (visible at right) to slide through a coil of wire (center) to generate electricity.
German dynamo flashlight from World War I. Pulling the pull-chain spun a flywheel, generating electricity to light the bulb on the front for about 5 seconds.

Flashlight that is powered by electricity generated by the muscle power of the user, so it does not need replacement of batteries, or recharging from an electrical source.

- Mechanically powered flashlight

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Spring (device)

Elastic object that stores mechanical energy.

Helical coil springs designed for tension
A heavy-duty coil spring designed for compression and tension
The English longbow – a simple but very powerful spring made of yew, measuring 2 m long, with a 105 lbf draw weight, with each limb functionally a cantilever spring.
Force (F) vs extension (s). Spring characteristics: (1) progressive, (2) linear, (3) degressive, (4) almost constant, (5) progressive with knee
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Military booby trap firing device from USSR (normally connected to a tripwire) showing spring-loaded firing pin
A spiral torsion spring, or hairspring, in an alarm clock.
Battery contacts often have a variable spring
A volute spring. Under compression the coils slide over each other, so affording longer travel.
Vertical volute springs of Stuart tank
Selection of various arc springs and arc spring systems (systems consisting of inner and outer arc springs).
Tension springs in a folded line reverberation device.
A torsion bar twisted under load
Leaf spring on a truck
Simplified LaCoste suspension using a zero-length spring
Spring length L vs force F graph of ordinary (+), zero-length (0) and negative-length (−) springs with the same minimum length L0 and spring constant

Mainspring: A spiral ribbon shaped spring used as a power store of clockwork mechanisms: watches, clocks, music boxes, windup toys, and mechanically powered flashlights

Electric generator

Device that converts motive power into electric power for use in an external circuit.

U.S. NRC image of a modern steam turbine generator (STG).
Early Ganz Generator in Zwevegem, West Flanders, Belgium
The Faraday disk was the first electric generator. The horseshoe-shaped magnet (A) created a magnetic field through the disk (D). When the disk was turned, this induced an electric current radially outward from the center toward the rim. The current flowed out through the sliding spring contact m, through the external circuit, and back into the center of the disk through the axle.
Hippolyte Pixii's dynamo. The commutator is located on the shaft below the spinning magnet.
This large belt-driven high-current dynamo produced 310 amperes at 7 volts. Dynamos are no longer used due to the size and complexity of the commutator needed for high power applications.
Ferranti alternating current generator, c. 1900.
A small early 1900s 75 kVA direct-driven power station AC alternator, with a separate belt-driven exciter generator.
The Athlone Power Station in Cape Town, South Africa
Hydroelectric power station at Gabčíkovo Dam, Slovakia
Hydroelectric power station at Glen Canyon Dam, Page, Arizona
Mobile electric generator
Protesters at Occupy Wall Street using bicycles connected to a motor and one-way diode to charge batteries for their electronics

This type of generator is used in the Faraday flashlight.

Linear alternator

Essentially a linear motor used as an electrical generator.

frameless

The simplest type of linear alternator is the mechanically powered flashlight (shake type).

Rare-earth magnet

Rare-earth magnets are strong permanent magnets made from alloys of rare-earth elements.

Ferrofluid on glass, with a rare-earth magnet underneath
Neodymium magnets (small cylinders) lifting steel balls. As shown here, rare-earth magnets can easily lift thousands of times their own weight.
Neodymium magnet with nickel plating mostly removed
Neodymium magnet balls

mechanically powered flashlights, employing rare earth magnets for generating electricity in a shaking motion or rotating (hand-crank-powered) motion

Freeplay Energy

Manufacturer and distributor of portable electrical or electronic products such as radios and lights, generally powered by hand cranked generators that charge rechargeable batteries.

While still called Baygen, the company introduced a clockwork torch.

Dynamo

Electrical generator that creates direct current using a commutator.

"Dynamo Electric Machine" (end view, partly section, )
The Faraday disk was the first electric generator. The horseshoe-shaped magnet (A) created a magnetic field through the disk (D). When the disk was turned, this induced an electric current radially outward from the center toward the rim. The current flowed out through the sliding spring contact m (connected to B') through the external circuit, and back through B to the center of the disk through the axle
Hippolyte Pixii's dynamo. The commutator is located on the shaft below the spinning magnet
Pacinotti dynamo, 1860
The Woolrich Electrical Generator in Thinktank, Birmingham
Small Gramme dynamo, around 1878
Low voltage dynamo for electroplating from the turn of the century. The resistance of the commutator contacts causes inefficiency in low voltage, high current machines like this, requiring a huge elaborate commutator. This machine generated 7 volts at 310 amps.

Hand cranked dynamos are used in clockwork radios, hand powered flashlights and other human powered equipment to recharge batteries.

Survival store

Retail outlet where survival or preparedness equipment can be purchased.

A grocery and cosmetics store in Tangier, Morocco

Wind-up flashlights

Human power

Work or energy that is produced from the human body.

A hybrid battery/hand-crank radio by Philips.
British penal treadwheel
A mechanically powered flashlight. This uses a linear generator and is charged by shaking along its long axis.
BC-778 "Gibson Girl" radio transmitter.
U.S. soldiers during WWII powering radio set using GN-45 hand crank generator
The original Baygen clockwork radio with crank in winding position
Pedal radio being used in South Solitary Island lighthouse, to communicate with Norah Head Lightstation, 1946

Others, such as mechanically powered flashlights, have the generator integrated within the device.

Index of environmental articles

The natural environment, commonly referred to simply as the environment, includes all living and non-living things occurring naturally on Earth.

The ecosystem of public parks often includes humans feeding the wildlife.

EverLife Flashlight

GravityLight

A Haitian boy turns the crank on his crank-powered flashlight radio. Mechanically powered flashlights were distributed by aid organizations to survivors of the 2010 Haiti earthquake since electric power was lost for a long period.

GravityLight was a gravity-powered lamp manufactured until 2019.