Galvanometer in a sentence

Tangent galvanometer Tangent galvanometer made by J. H. Bunnell Co. around 1890.

The string galvanometer was a type of mirror galvanometer so sensitive that it was used to make the first electrocardiogram of the electrical activity of the human heart.

Unlike a compass-needle galvanometer, the astatic galvanometer has two magnetic needles parallel to each other, but with the magnetic poles reversed.

A circuit was used consisting of a battery, the body to be tested, and a galvanometer; the electromotive force of the battery used was 1 volt at first, then 100 volts, and then again 1 volt.

An early D'Arsonval galvanometer showing magnet and rotating coil.

A tangent galvanometer consists of a coil of insulated copper wire wound on a circular non-magnetic frame.

Galvanometer mechanisms are divided into moving magnet and moving coil galvanometers; in addition, they are divided into closed-loop and open-loop - or resonant - types.

Galvanometer mechanisms were also used to get readings from photoresistors in the metering mechanisms of film cameras (as seen in the image to the right).

He used a galvanometer as a sensitive timing device, attaching a mirror to the needle to reflect a light beam across the room to a scale which gave much greater sensitivity.

He used a galvanometer to measure current, and knew that the voltage between the thermocouple terminals was proportional to the junction temperature.

History Thomson mirror galvanometer, patented in 1858.

In 1821, André-Marie Ampère suggested that telegraphy could be done by a system of galvanometers, with one wire per galvanometer to indicate each letter, and said he had experimented successfully with such a system.

Moving coil type galvanometer mechanisms are used for controlling the head positioning servos in hard disk drives and CD/DVD players, in order to keep mass (and thus access times), as low as possible.

Since the 1980s, galvanometer-type analog meter movements have been displaced by analog to digital converters (ADCs) for many uses.

Subsequent designs of ohmmeter provided a small battery to apply a voltage to a resistance via a galvanometer to measure the current through the resistance.

The earliest galvanometer was reported by Johann Schweigger at the University of Halle on 16 September 1820.

Theory Top view of a tangent galvanometer made about 1950.

The scale of the galvanometer was marked in ohms, because the fixed voltage from the battery assured that as resistance is decreased, the current through the meter would increase.

These were similar to the galvanometer type movement encountered in later instruments, but instead of hairsprings to supply a restoring force they used conducting 'ligaments' instead.

The tangent galvanometer was used to measure currents using this effect, where the restoring force returning the pointer to the zero position was provided by the Earth's magnetic field.