" At other exhibits, he remembered how a flashlight that shined on a photoelectric cell created a cracking sound, and how the sound from a tuning fork became a wave on an oscilloscope.

Hubble Sequence | Hubble tuning fork diagram of galaxy morphology

* A piezoelectric " tuning fork " has been constructed, which can be placed into a superposition of vibrating and non vibrating states.

Substitution as makeshift is when human ingenuity comes into play and a tool is used for its unintended purpose such as a mechanic using a long screw driver to separate a cars control arm from a ball joint instead of using a tuning fork.

A tuning fork is an acoustic resonator in the form of a two-pronged fork with the prongs ( tines ) formed from a U-shaped bar of elastic metal ( usually steel ).

The pitch that a particular tuning fork generates depends on the length of the two prongs.

A needle on a tuning fork carves figures on carbon black.

The tuning fork was invented in 1711 by British musician John Shore, Sergeant Trumpeter and Lutenist to the court, who had parts specifically written for him by both George Frideric Handel and Henry Purcell.

Currently, the most common tuning fork sounds the note of A = 440 Hz, because this is the standard concert pitch, which is used as tuning note by some orchestras, it being the pitch of the violin's second string, the first string of the viola, and an octave above the first string of the cello, all played open.

The pitch of a tuning fork can vary slightly with weathering and temperature.

A decrease in frequency of one vibration in 21, 000 for each ° F change is typical for a steel tuning fork.

The frequency of a tuning fork depends on its dimensions and the material from which it is made:

Quartz crystal resonator from a quartz watch, formed in the shape of a tuning fork.

The Accutron, an electromechanical watch developed by Max Hetzel and manufactured by Bulova beginning in 1960, used a 360 hertz steel tuning fork powered by a battery as its timekeeping element.

The humming sound of the tuning fork could be heard when the watch was held to the ear.

The tuning fork that John Shore gave to Handel gives a pitch of C512.

* Onlinetuningfork. com, an online tuning fork using Macromedia Flash Player.

* John Shore invents the tuning fork.

** Piano tuning, adjusting the pitch of pianos using a tuning fork or a frequency counter

Low-frequency crystals, such as those used in digital watches, are typically cut in the shape of a tuning fork.

This means that a tuning fork crystal oscillator will resonate close to its target frequency at room temperature, but will slow down when the temperature either increases or decreases from room temperature.

They also enabled tunable oscillators in early discrete tuning of radios, where a cheap and stable, but fixed-frequency, crystal oscillator provided the reference frequency for a voltage-controlled oscillator.

A common parabolic coefficient for a 32 kHz tuning fork crystal is − 0. 04 ppm /° C².

In a real application, this means that a clock built using a regular 32 kHz tuning fork crystal will keep good time at room temperature, lose 2 minutes per year at 10 degrees Celsius above ( or below ) room temperature and lose 8 minutes per year at 20 degrees Celsius above ( or below ) room temperature due to the quartz crystal.

An oscillator crystal has two electrically conductive plates, with a slice or tuning fork of quartz crystal sandwiched between them.

Crystal radios are the simplest type of radio receiver and can be handmade with a few inexpensive parts, like an antenna wire, tuning coil of copper wire, crystal detector and earphones.

Some modern crystal sets use a ferrite core tuning coil, in which the core is mounted on a threaded shaft and a knob turns the shaft, moving the core in and out of the coil, varying the inductance by changing the magnetic permeability.

Many early crystal sets did not have a tuning capacitor, and relied instead on the capacitance inherent in the wire antenna ( in addition to significant parasitic capacitance in the coil itself ) to form the tuned circuit with the coil.

The other place impedance matching was often used was between the tuning coil and the crystal detector / earphone circuit, to match the impedance of the detector.

In more sophisticated crystal receivers, the tuning coil was replaced with an adjustable air core antenna coupling transformer which improved the selectivity by a technique called loose coupling.

The human ear can recognize single cosine waves as sounding clear because sine waves are representations of a single frequency with no harmonics ; some sounds that approximate a pure sine wave are whistling, a crystal glass set to vibrate by running a wet finger around its rim, and the sound made by a tuning fork.

He started work at the National Physical Laboratory ( NPL ) the following year, under D. W. Dye, investigating the potential of tuning forks and quartz crystal oscillators for precise time measurement.

When used together, the SB-300 receiver and SB-400 transmitter could transceive and had many other features of the S / Line, including crystal bandwidth filters and 1 kHz tuning dial resolution.

The timekeeping in the 224 was actually regulated by a quartz crystal, but it still incorporated a tuning fork as the source of motive power for the gear train.

Also remember that an Accutron with a 224 movement, which should be labeled " Accuquartz " on its dial, is a hybrid movement, with its timekeeping actually regulated by a quartz crystal rather than by the tuning fork itself, but many consider these to be collectible because they were only made for 5 years, resulting in a low total production number and corresponding rarity today.

The units included crystal bandpass filters and a new compact PTO design that provided stable, highly linear tuning across 200 kHz band segments.

With the introduction of the Bulova " Accutron " watch that used a tuning fork as a time reference ( watches later used an oscillating electronic crystal ), the camera no longer needed to be connected to the sound recorder with a cable.

* Model SX-96 ( 1954-5 ), general coverage ( 560 kHz-30MHz / 4 bands ), S-meter, crystal filter, amateur bandspread ( 10-80m ), dual tuning dials, RF and audio gain controls, beat frequency oscillator ( controllable frequency ), transmit / receive switch, sold for ~$ 169.

Other design innovations included crystal bandwidth filters and a permeability tuned oscillator ( PTO ) capable of extremely linear, stable tuning and a dial resolution of better than 1 kHz across all amateur HF ( shortwave ) bands.

Furthermore, conditioned reactions are fundamentally altered when the hypothalamic sympathetic reactivity is augmented beyond a critical level, and several types of behavioral changes probably related to the degree of central autonomic `` tuning '' are observed.

The standard tuning for an acoustic guitar is E-A-D-G-B-E ( low to high ), although many players, particularly fingerpickers, use alternate tunings ( scordatura ), such as " open G " ( D-G-D-G-B-D ), " open D " ( D-A-D-F-A-D ), or " drop D " ( D-A-D-G-B-E ).

Critics of the SAP argue in favor of a weak anthropic principle ( WAP ) similar to the one defined by Brandon Carter, which states that the universe's ostensible fine tuning is the result of selection bias: i. e., only in a universe capable of eventually supporting life will there be living beings capable of observing any such fine tuning, while a universe less compatible with life will go unbeheld.

Sometimes the balalaika is tuned " guitar style " by folk musicians to G-B-D ( mimicking the three highest strings of the Russian guitar ), whereby it is easier to play for Russian guitar players, although classically trained balalaika purists avoid this tuning.

In game design, balance is the concept and the practice of tuning relationships between a game's component systems.

The most common by far, which one could call the " standard tuning " is:

The above order, is the tuning from the 1st string ( highest-pitched string e '— spatially the bottom string in playing position ) to the 6th string ( lowest-pitched string E — spatially the upper string in playing position, and hence comfortable to pluck with the thumb.

This policy is also why Canadian viewers do not see American advertisements during the Super Bowl, even when tuning into one of the many American networks carried on Canadian televisions.

Intake port tuning and scavenging may allow a greater mass of charge ( at a higher than atmospheric pressure ) to be trapped in the cylinder than the static volume would suggest ( This " corrected " compression ratio is commonly called the " dynamic compression ratio ".

The desired closed loop dynamics is obtained by adjusting the three parameters, and, often iteratively by " tuning " and without specific knowledge of a plant model.

On modern band and orchestral drums, the drumhead is placed over the opening of the drum, which in turn is held onto the shell by a " counterhoop " ( or " rim "), which is then held by means of a number of tuning screws called " tension rods " which screw into lugs placed evenly around the circumference.

Though it typically may be expected that operational requirements are automatically met by a DBMS, in fact it is not so in most of the cases: To be met substantial work of design and tuning is typically needed by database administrators.

A small amount of additional tuning is available by ' entry save ' techniques, whereby underwater movements of the upper body and arms against the viscosity of the water affect the position of the legs.

The double bass, also called the string bass, upright bass, bass fiddle, bass violin, doghouse bass, contrabass, bass viol, stand-up bass or bull fiddle, is the largest and lowest-pitched bowed string instrument in the modern symphony orchestra, with strings usually tuned to E1, A1, D2 and G2 ( see standard tuning ).

The standard tuning ( low to high ) is E-A-D-G, starting from E below second low C ( concert pitch ).

This is the same as the standard tuning of a bass guitar and is one octave lower than the four lowest-pitched strings of standard guitar tuning.

This tuning was used by the jazz player Red Mitchell and is increasingly used by classical players, notably the Canadian bassist Joel Quarrington.