They ordered the biggest magnet available – a 1. 5T system – and built the first high-field whole-body MRI / MRS scanner, overcoming problems of coil design, RF penetration and signal-to-noise.

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 first type of transformer to see wide use was the induction coil, invented by Rev.

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 ).

* September 21 – William Stanley, Jr. patents the first practical alternating current transformer device, the induction coil.

In operation, the instrument is first rotated until the magnetic field of the Earth, indicated by the compass needle, is parallel with the plane of the coil.

The galvanometer is first aligned so that the coil is parallel to the geomagnetic field, whose direction is indicated by the compass when there is no current through the coils.

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 ).

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 MHz ).

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.

After the first line has been evaluated, the output coil ( S ) is fed into rung 2, which is then evaluated and the output coil T could be fed into an output device ( buzzer, light etc ..) or into rung 3 on the ladder.

It was one of the first mass production off-road vehicles to feature a unibody architecture ( the first was GAZ-M-72 in 1955 ), independent front suspension and coil suspension, and is a predecessor to current crossover SUVs which nearly all follow this format.

In 1931, he demonstrated that a magnetic coil could act as an electron lens, and used several coils in a series to build the first electron microscope in 1933.

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 > 1 </ sub > is the inductance of the first coil, and

MEG signals were first measured by University of Illinois physicist David Cohen in 1968, before the availability of the SQUID, using a copper induction coil as the detector.

Before the advent of valve ( vacuum tube ) technology, early radio enthusiasts used noisy spark-gap transmitters, such as the first spark-gap modulation technology pioneered by the first real audio ( rather than telegraph code ) radio broadcaster, Charles D. Herrold, in San Jose, California, or the infamous Ruhmkorff coil used by almost all early experimenters.

He was the first to coil insulated wire tightly around an iron core in order to make a more powerful electromagnet, improving on William Sturgeon's electromagnet which used loosely coiled uninsulated wire.

She'd found one and she hadn't said a word while Big Hans and I had hunted and hunted as we always did all winter, every winter since the spring that Hans had come and I had looked in the privy and found the first one.

The sequence of events leading to his important discovery still remains ambiguous but it seems that one of the advanced students at the university related that the first direct event that led to the publication of Oersted's discovery occurred during a private lecture made before a group of other advanced students in the spring of 1820.

In January, 1958, the Minister of the Interior announced that an election law was ready to be submitted to the King, the rumors of election dates appeared once again, first for spring of 1958 and later for the summer.

The conductor's preoccupation with the business of starting and stopping caused occasional raggedness, as with the first orchestra entrance in the Fourth Piano Concerto, but when he put his deliberations and obsequies aside and let the music move as designed, it did so with plenty of spring.

But by the time the first crackling of spring came around, we both knew we were hopelessly in love.

Benny and Björn scored their first hits as songwriters in the spring of 1969: " Ljuva Sextital " ( a hit with Brita Borg ) and " Speleman " ( a hit for The Hep Stars ).

The patriotic society of the commune was one of the first 21 created in Alpes-de-Haute-Provence, in spring 1792, by the envoys of the departmental administration.

The first houses were built in the spring of 1631.

In spring 1989, Flockhart made her first television appearance in a minor role in an episode of Guiding Light as a babysitter.

He handed responsibility to his assistant, Liz Reitell, who was keen to see Thomas for the first time since their three week romance in the spring.

Those who place first lunar month of the year in twelfth zodiacal sign before the spring equinox and fix the Paschal fourteenth day accordingly, make a great and indeed an extraordinary mistake

Hardy perennials, such as Hosta, become dormant after the first frosts and regrow when spring arrives.

In the 1990s, organizations began to spring up in non-western countries, such as Progay Philippines, which was founded in 1993 and organized the first Gay Pride march in Asia on June 26, 1994.

By 8500-7500 BC the Pre-Pottery Neolithic A ( PPNA ) culture developed out of the earlier local tradition of Natufian in Southern Palestine, dwelling in round houses, and building the first defensive site at Jericho ( guarding a valuable fresh water spring ).

It may be noted that in the Bible the name of the first month, Aviv, literally means " spring ".

It generally occurs during the spring and summer months, although some mares may be sexually receptive into the late fall, and is controlled by the photoperiod ( length of the day ), the cycle first triggered when the days begin to lengthen.

The next day, Aaron made his first spring training start for the Braves ' major league team, playing in left field and hitting a home run.

Some Neopagans time the celebration to the solar midpoint between the winter solstice and spring equinox, which now falls later in the first week or two of February.

They usually celebrate the festival when the first stirrings of spring are felt, or on the full moon nearest this.

He probably first met the poet John Keats in the spring of 1816.

The first permanent settlement was built near the Ein as-Sultan spring between 10000 and 9000 BCE.

After graduating from PJC in spring 1939, Robinson transferred to UCLA, where he became the school's first athlete to win varsity letters in four sports: baseball, basketball, football, and track.

Parliament voted for the release of the former Lebanese Forces warlord Samir Geagea in the first session since election were held in the spring of 2005.

According to Environment Canada, Manitoba ranked first for clearest skies year round, and ranked second for clearest skies in the summer and for sunniest province in the winter and spring.

In Rome, where the climate is Mediterranean, March was the first month of spring, a logical point for the beginning of the year as well as the start of the military campaign season.