The tuning fork is between the two Electromagnet | electromagnetic coils at the top of the watch, which drive it.

The original induction balance coil system consisted of two identical coils placed on top of one another.

The watt balance is a more accurate version of the ampere balance, an early current measuring instrument in which the force between two current-carrying coils of wire is measured and then used to calculate the magnitude of the current.

In this new application, the balance will be used in the opposite sense ; the current in the coils necessary to support the weight of a standard kilogram mass will be measured, " weighing " the kilogram.

The main weakness of the ampere balance method is that the result depends on the accuracy with which the dimensions of the coils are measured.

The watt balance method has an extra calibration step in which the effect of the geometry of the coils is eliminated, removing the main source of uncertainty.

The current to be measured is passed in series through two coils of wire, one of which is attached to one arm of a sensitive balance.

The magnetic force between the two coils is measured by the amount of weight needed on the other arm of the balance to keep it in equilibrium.

The main weakness of the ampere balance is that the calculation of the current involves the dimensions of the coils.

As the balance wheel goes from one extreme position to the other in its swing back and forth, the hairspring's coils extend and contract a great deal, leading to problems that are extremely hard to counteract.

Ordinary Weston-type meter movements can measure only milliamperes at most, because the springs and practical coils can carry only limited currents.

* Progressive rate coil springs – A coil spring with a variable rate, usually achieved by having unequal pitch so that as the spring is compressed one or more coils rests against its neighbour.

The Christie suspension, with internal vertical spring coils, was replaced by a Horstmann suspension with external horizontal springs.

Valve float was analyzed and found to be caused largely by resonance in valve springs that generated oscillating compression waves among coils, much like a Slinky.

The number of active coils in these springs varies during the stroke, the more closely wound coils being on the static end, becoming inactive as the spring compresses or as in the beehive spring, where the small diameter coils at the top are stiffer.

In 8-way hand tying, metal bands are affixed to the webbing for extra support and to facilitate the placement of the coils ( or springs ).

Both ends of the car featured coils springs, tubular dampers, and an anti-roll bar, as well as disk brakes.

Brakes were hydraulic and assisted by the Rolls-Royce mechanical servo with drums and suspension was independent coils at the front and semi-elliptic springs at the rear.

The independent front suspension used ball-jointed wishbones and coil springs and the live rear axle also using coils springs with location by a Watt's linkage.

It had coil springs ( very hard ) and bottoming coils instead of rubber pads.

At an exhibition, Jens Ekornes saw a British mattress whose interior consisted of a large number of springs linked together on both sides by steel coils.

The springs were linked together by steel coils, and could be used inside furniture cushions as well as mattresses.

Coil springs are individual coils, open at both ends.

Suspension was simple but effective with double wishbone and coil springs at the front, and a live rear axle with trailing arms and coils at the rear.

In 1960, Renault revised the suspension with the addition of extra rubber springs up front and auxiliary air spring units ( mounted inboard of the conventional coils ) at the rear — marketing the system as Aerostable — and giving the rear wheels a small degree of negative camber and increased cornering grip.

A robust mechanical structure is usually required to contain the very large Lorentz forces generated by and on the magnet coils.

The primary and secondary coils are wrapped around a core of very high magnetic permeability, such as iron, so that most of the magnetic flux passes through both the primary and secondary coils.

The very first demonstration of loading coils on a telephone cable was on a 46-mile length of the so-called Pittsburgh cable ( the test was actually in Boston, the cable had previously been used for testing in Pittsburgh ) on September 6, 1899 carried out by Campbell himself and his assistant.

The technology can also produce very small magnetometers that may in the future replace coils for detecting changing magnetic fields.

Induction hardening is a surface hardening technique which uses induction coils to provide a very rapid means of heating the metal.

The magnetic induction coils typically consist of tens-to hundreds-of-thousands of turns of wire wound around a core of very high magnetic permeability.

It is assumed in the " tightly coupled " case M is very nearly equal to L. However, if the inductances are not equal and the coils are tightly coupled there can be near short circuit conditions and high circulating currents for both positive and negative values of M, which can cause problems.

Among the other etchings which deserve very special reference are those in Young Master Troublesome or Master Jacky's Holidays, and the frontispiece to Hints on Life, or How to Rise in Society ( 1845 )— a series of minute subjects linked gracefully together by coils of smoke, illustrating the various ranks and conditions of men, one of them — the doctor by his patient's bedside — almost equalling in vivacity and precision the best of Cruikshank's similar scenes.

Heating coils inside the catalytic converter assemblies are electrified just after engine start, bringing the catalyst up to operating temperature very quickly to qualify the vehicle for low emission vehicle ( LEV ) designation.

In an autotransformer, two coils on a ferrite rod can be used as a balun by winding the individual strands of enameled wire comprising the coil very tightly together.

Spark plug wires, which need routine replacement due to wear, are also eliminated when the individual coils are mounted directly on top of each plug, since the power is transported a very short distance from the coil to the plug.

The coils are tiny and made from very fine wire.

Ananke is the primeval goddess of inevitability, and she is entwined in the serpentine coils of her mate, the time-god Chronos, at the very beginning of time.

Camera-tube focus coils, by themselves, have essentially parallel lines of force, very different from the localized semi-toroidal magnetic field geometry inside a TV receiver CRT focus coil.

The originally polychrome bust is usually thought to represent a woman wearing a very complex headdress and big coils on each side of the face.

They can be refrigerated with an external jacket or, for very large vessels, with internal coils.

Although the design is very similar to the 335, the 345 featured a multi-position " Varitone " switch located just above the lead tone and volume controls, which added various combination of coils and capacitors to the electronic pickup circuit of guitar in order to alter its resonant frequency and add " color " to the sound.

In this frequency range their realization is very difficult because of the very high voltages that occur in the huge tuned loading coils that are used in the antenna feed.

By exposing part of the winding coils and making the secondary connection through a sliding brush, a continuously variable turns ratio can be obtained, allowing for very smooth control of voltage.

* Large sheet metal components cannot readily be formed, due to current limitations on the design of very large coils

His aspect is very terrible: “ He is an old man, his eyes were as red burning coals, long grey hair fell over his shoulders in matted coils, his garments, which were of antique cut, were soiled and ragged, and from his wrists and ankles hung heavy manacles and rusty gyves .”

Because of its low side walls, gondolas are used to carry either very dense material, such as steel plates or coils, or bulky items such as prefabricated pieces of rail track.