Other wave shapes require a different calibration factor to relate RMS and average value.

More expensive multimeters include an AC to DC converter that measures the true RMS value of the waveform within certain limits ; the user manual for the meter may indicate the limits of the crest factor and frequency for which the meter calibration is valid.

* 1906 – Cunard Line's RMS Lusitania is launched at the John Brown Shipyard, Glasgow ( Clydebank ), Scotland.

* RMS thread, also known as society thread, is a special 0. 8 "- 36 Whitworth thread form used for microscope objective lenses.

* 1942 – World War II: RMS Laconia, carrying civilians, Allied soldiers and Italian POWs is torpedoed off the coast of West Africa and sinks with a heavy loss of life.

There is no direct service to Ascension Island and the United Kingdom, without flying from Cape Town to London or travelling on the RMS St Helena from Cape Town to St Helena.

On 7 May 1915, sank the liner RMS Lusitania with a single torpedo hit, although it is debated whether a second explosion was due to flammable cargo or another torpedo.

* May 31 – The hull of the RMS Titanic is launched.

* April 21 – RMS Aquitania, built by John Brown & Company, is launched on the Clyde.

* On 7 May 1915, the British ocean liner RMS Lusitania is torpedoed by, a German U-boat, off the Old Head of Kinsale in Ireland and sinks in 18 minutes.

* September 12 – The RMS Laconia, carrying civilians, Allied soldiers and Italian POWs, is torpedoed off the coast of West Africa and sinks.

* January 9 – The RMS Queen Elizabeth is destroyed by fire in Hong Kong harbor.

* May 7 – WWI: The RMS Lusitania is sunk by a German U-boat, killing 1, 198.

* October 20 – The hull of the RMS Olympic is launched at the Harland and Wolff Shipyards in Belfast.

* December 1 – The RMS Queen Mary is retired.

Her place is taken by the RMS Queen Elizabeth 2.

** The wreck of the RMS Titanic ( 1912 ) in the North Atlantic is located by a joint American-French expedition led by Dr. Robert Ballard ( WHOI ) and Jean-Louis Michel ( Ifremer ) using side-scan sonar from RV Knorr.

Root mean square ( RMS ) amplitude is used especially in electrical engineering: the RMS is defined as the square root of the mean over time of the square of the vertical distance of the graph from the rest state.

For complex waveforms, especially non-repeating signals like noise, the RMS amplitude is usually used because it is both unambiguous and has physical significance.

For example, the average power transmitted by an acoustic or electromagnetic wave or by an electrical signal is proportional to the square of the RMS amplitude ( and not, in general, to the square of the peak amplitude ).

For alternating current electrical power, the universal practice is to specify RMS values of a sinusoidal waveform.

The peak-to-peak voltage of a sine wave is about 2. 8 times the RMS value.

Such instruments are generally calibrated to indicate the RMS value for a sine wave only but some designs will indicate true RMS ( sometimes with limitations as to wave shape ).

The RMS Saint Helena used to connect the main island to St Helena and South Africa once each year during its January voyage, but has only done so twice in the last few years, namely 2006 and 2011.

The Terracotta Army has been described as the only other set of historic artifacts ( along with the remnants of ruins of the RMS Titanic ) which can draw a crowd simply on the back of the name alone.

In 1912, two Pomeranians were among only three dogs to survive the sinking of RMS Titanic.

Holland America Line produced some noted ships, from the 36, 000 gross ton of 1937 ( besides the RMS Queen Mary, the only 1930s-built liner to make a profit ) and the of 1959, one of the first North Atlantic ships equipped for two-class transatlantic crossing and one-class luxury cruising.

RMS Titanic, with a gross register tonnage of 46, 329 GRT, but a displacement reported at over 52, 000 tons, was heavier than contemporary 100, 000 – 110, 000 GT cruise ships which displace only around 50, 000 tons.

* RMS Olympic ( Hull only during 1937 as superstructure was removed at Jarrow between 1935 to 1937 )

It should be borne in mind that this voltage specification is RMS, not peak, and also that it is only a nominal ( approximate ) value.

This explains why a much larger system is needed to improve the existing measurements — the current 2 cm RMS range precision requires only about 10 photons, even at the worst-case orientation of the retroreflector array.

While some lines in the past, particularly the Royal Mail Lines, called all their ships RMS, technically a ship would use the prefix only while contracted to carry mail, and would revert at other times to a standard designation such as " SS ".

His namesake, Washington Augustus Roebling II, born March 25, 1881, only son of his brother Charles G. Roebling, went down with the RMS Titanic in 1912.

Released only one year after the sinking of the RMS Titanic, the movie drew considerable attention as well as criticism due to similarities to the actual tragedy.

There seemed to be only one worthwhile ideal and that was the creation of the RMS.

His father perished in the sinking of the RMS Lusitania in 1915 when George was only a year old.

Before VAX BASIC ( as it was then called ), you would only get native RMS support in DEC's COBOL compiler.

Bricks and other materials made by the company were not only used locally ( notably in the Stonehouse police station and post office ) and in other areas of Britain, but were also used as far away as Cape Town, Gibraltar, and Buenos Aires, with those used in Gibraltar transported there on the RMS Lusitania during her sea trials.

However, since AC is a sine wave, the effective power that can be transmitted through the line is related to the root mean squared ( RMS ) value of the voltage, which for a sine wave is only 0. 7 times the peak value.

The RMS Empress of Ireland shipwrecking is documented in the Empress of Ireland Pavilion and you can also visit the only submarine open to the public in Canada,.

Identifying himself as a passenger, he defiantly boards a lifeboat, only to experience a nervous breakdown aboard the RMS Carpathia.

Roughness is typically measured in " RMS " microinches and is often only measured by manual comparison against a " surface roughness comparator ", a sample of known surface roughnesses.