In the ratchet and cam example, the first pulse to the coil turns the relay on and the second pulse turns it off.

Exchange operation soon resulted in telephones being equipped with a bell in a ringer box, first operated over a second wire, and later over the same wire, but with a condenser ( capacitor ) in series with the bell coil to allow the AC ringer signal through while still blocking DC ( keeping the phone " on hook ").

The transformer is based on two principles: first, that an electric current can produce a magnetic field ( electromagnetism ) and second that a changing magnetic field within a coil of wire induces a voltage across the ends of the coil ( electromagnetic induction ).

The coil and thermistor are intentionally sized so that the current flow will heat the thermistor to the point that the degaussing coil shuts off in under a second.

This creates a second magnetic field on the axis of the coil, perpendicular to the Earth's magnetic field.

When a current passes through the galvanometer coil, a second magnetic field B perpendicular to the coil is created, of strength:

A second problem was that the material science of the time had difficulties sealing the joint between coil and cable against ingress of seawater.

One coil, A, will be connected through a resistor and the second coil, B, through an inductor, so that the current in coil B is delayed with respect to current in A.

A second stationary field coil, perpendicular to the voltage coils, carries a current proportional to current in one phase of the circuit.

The coil of an electromagnet, called a field coil, was energized by current through a second pair of connections to the driver.

These electrons interact with the radio-frequency magnetic field of the induction coil and are accelerated first in one direction, then the other, as the field changes at high frequency ( usually 27. 12 million cycles per second ).

A radio-frequency alternating current is passed through a coil of wire that acts as the transmitter, and a second coil or conducting object, magnetically coupled to the first coil, acts as the receiver.

This constantly changing field induces an electrical current in the second coil, and this output current is measured by a detector.

Rollin White developed a form of water tube steam generator which consisted of a series of stacked coils with two novel features: the first, and most fundamental, was that the coils were all joined at the top of the unit, which allowed water to flow through only when pumped, allowing control of the steam generation ; the second was pulling steam from the lowest coil, closest to the fire, which allowed for the control of steam temperature.

: L < sub > 2 </ sub > is the inductance of the second coil.

The second fuel tank can be insulated and a heating coil using engine coolant is run through the tank.

Greg himself took two flights, with Todman leading the second, to patrol and look for targets of opportunities around Ormoc on the east coast of Leyte.

Their skin was covered with a thin coating of sweat and dirt which had almost the consistency of a second skin.

Steinberg spoke with warmth and enthusiasm about Italy: `` Rome is my second home.

John Adams fashioned much of pre-Revolutionary radical ideology, wrote the constitution of his home state of Massachusetts, negotiated, with Franklin and Jay, the peace with Britain and served as our first Vice President and our second President.

The active sponsor of Jefferson's measure for religious liberty in Virginia, Madison played the most influential single role in the drafting of the Constitution and in securing its ratification in Virginia, founded the first political party in American history, and, as Jefferson's Secretary of State and his successor in the Presidency, guided the nation through the troubled years of our second war with Britain.

Sibylla is pregnant with their second child when she finds the ivory tablet concealed by her husband, and the identities of mother and son are revealed.

The second reason for his popularity is his complete spontaneity with the guitar.

Peter Marshall noted that Bang-Jensen had later referred to his two interviews with the Gross group as `` unfortunate experiences '', and after his second meeting on the sixteenth the Dane refused to attend further hearings without legal counsel.

During the next years he gave me the second of the five contracts I would sign with the Hearst Service.

The second timely part of this sketch of literature and the search for identity has to do with the difference between good and enduring literary works and the ephemeral mass culture products of today.

By 1783 her legions had managed to annex the Crimea amid scenes of wanton cruelty and now, in this second combat with the Crescent, were aiming at suzerainty over all of the Black Sea's northern shoreline.

In his second letter the old mercer advised his son `` to bye some such warys as yow may selle presentlye with profet.

Carvey considers that former Vice President Nixon would be Brown's most formidable foe, with ex-Gov. Knight a close second.

But during the second half of the century its fortunes reached a low point and when in 1897 Cyrus H. K. Curtis purchased it -- `` paper, type, and all '' -- for $1,000 it was a 16-page weekly filled with unsigned fiction and initialed miscellany, and with only some 2,000 subscribers.

The 15th Street deposit is not to be confused with the nearby famous Mayflower Hotel cypress swamp on 17th Street reported in The Washington Post, August 2, 1955, which was probably formed during the second interglacial period and is therefore much younger.

and second, to increase uniformly the allotments to those States whose allotments are below their maximums, with adjustments to prevent the allotment of any State from thereby exceeding its maximum.

The second capability is represented by our deployed ground, naval, and air forces in essential forward areas, together with ready reserves capable of effecting early emergency reinforcement.

A second fundamental principle is that involved particularly in the present proceeding -- the difference between nighttime and daytime propagation conditions with respect to the standard broadcast frequencies.

A second and also good practice is to shear off the tops, leaving an inch high stub with just a leaf or two on each branch.

Going through the Imperial Gate in the wall, I entered the grounds of Topkapi Palace, home of the Sultans and nerve center of the vast Ottoman Empire, and walked along a road toward another gate in the distance, past the Church of St. Irene, completed by Constantine in 330 A.D. on my left, and then, just outside the second gate, I saw a spring with a tap in the wall on my right -- the Executioner's Spring, where he washed his hands and his sword after beheading his victims.

In recognition of the growing trend for second homes, or vacation cottages, we have designed this one specifically with the family handyman in mind.

The video signal is amplified and then switched, in synchronism with the three ultraviolet light sources which are sequenced by the rotating mirror so that during one-twentieth of a second only one wavelength, corresponding to red, green, or blue, is seen.

As shown in Fig. 4, an external antenna is placed over or around the patient and excited 3000 times a second with short 400-kc. bursts.

In many cases the revolutionary production has offered no more than sensational effects: the first hearing was fascinating and the second disillusioning as the gap between sound and substance became clearer.

Most countries in this second category share the difficulty of having many of the structures of a modern political and social system without the modern standards of performance required to make them effective.

The lean and leathery Oklahoma amateur, who has been playing topnotch tournament golf for many years, refused to let the Masters jitters overtake him and closed the tournament with his second straight 69.

My father went as a missionary to China in a generation that responded to Student Volunteer Movement speakers who held watches in their hands and announced to the students in their audiences how many Chinese souls were going to hell each second because these students were not over there saving them.

They are a set of axioms strong enough to prove many important facts about number theory and they allowed Gödel to establish his famous second incompleteness theorem.

Many of the settings for Agatha Christie ’ s books were directly inspired by the many archaeological field seasons spent in the Middle East on the sites managed by her second husband Max Mallowan.

The Senate took three votes: on May 16, it voted on the 11th article of impeachment, which included many of the charges contained in the other articles, and on May 26 voted on the second and third articles, after which the trial adjourned.

It is difficult to differentiate this Aeolus from the second Aeolus, as their identities seem to have been merged by many ancient writers.

In 2011 Hill published her second book, Reimagining Equality: Stories of Gender, Race, and Finding Home, which focuses on the sub-prime lending crisis that resulted in the foreclosure of many homes owned by African-Americans.

Light curing adhesives can cure in as little as a second and many formulations can bond dissimilar substrates ( materials ) and withstand harsh temperatures.

Grant followed the album with her second Christmas album, Home For Christmas in 1992, which included the song " Breath of Heaven ( Mary's Song )", written by Chris Eaton and Grant, and would later be covered by many artists, including Donna Summer, Jessica Simpson ( who acknowledged Grant as one of her favorite artists ), Vince Gill, Sara Groves, Point of Grace, and Broadway star Barbara Cook.

There are two key challenges: first, many patients have impaired circulation in their extremities, and second, they have difficulty curing infections in limbs with poor vasculation ( blood circulation ).

The second scribe slaved over the poem for many years " with great reverence and care to restoration ".

A major modification to Noth's theory was made in 1973 by the American scholar Frank M. Cross, to the effect that two editions of the history could be distinguished, the first and more important from the court of king Josiah in the late 7th century, and the second Noth's 6th century Exilic history, and other scholars have detected many more authors / editors than either Noth or Cross allowed for.

The first was the late 7th century Deuteronomistic reform of official Judean religion under king Josiah, who banned many elements of the old polytheistic cult from the Temple, and the sudden collapse of Assyria and the rise of Babylon to take its place ; the second was exile of the royal court, the priests and other members of the ruling elite following the Babylonian destruction of Jerusalem c. 586 BCE.

In the second Beeching report of 1965 only the " major trunk routes " were selected for large-scale investment, leading many to speculate the rest of the network would eventually be closed.

Bambara, also known as Bamana, and Bamanankan by speakers of the language, is a language spoken in Mali, and to a lesser extent Burkina Faso, Senegal by as many as six million people ( including second language users ).

A small number of the best equipped and " elite divisions were offset by many second and third rate divisions ".

Also similar to the Qin, traditional history has judged the Sui somewhat unfairly, as it has stressed the harshness of the Sui regime and the arrogance of its second emperor, giving little credit for the Dynasty's many positive achievements.

According to the World Health Organization, physical inactivity is second only to tobacco smoking as a health risk in developed countries, and this is associated with many tens of billions of dollars of healthcare costs.

Ingram, older than the rest of the members of the band, left to serve active duty in Vietnam, and was later replaced by Walter " Clyde " Orange, the second lead singer who wrote or co-wrote many of their hit tunes before Lionel Richie came on board.

1999 — A second era of political instability begins, starting with five different coalitions in less than nine months, and at least as many since then.

Saadia Gaon, who translated it into Arabic in the 9th century, ascribed it to the Maccabees themselves, disputed by some, since it gives dates as so many years before the destruction of the second temple in 70 CE.

The first rule is used in many ( but not all ) dictionaries, the second in telephone directories ( so that Wilson, Jim K appears with other people named Wilson, Jim and not after Wilson, Jimbo ).

The second one happens on the evening of 24 December ; gifts are placed under the Christmas tree, usually in the absence of Santa-believing children ( many of whom are occupied with watching the sky in search of the first star ) if there are any in the family.