They had taken the string galvanometer and adapted it to record signals from microphones onto photographic film.
2.
Forbes reported the replacement of the string galvanometer with a vacuum tube to amplify the EEG in 1920.
3.
The first human electrocardiogram was recorded in 1887, however only in 1901 was a quantifiable result obtained from the string galvanometer.
4.
The breakthrough came when Einthoven, working in Leiden, used his more sensitive string galvanometer, than the " capillary electrometer " that Waller used.
5.
An initial breakthrough came when Willem Einthoven, working in Leiden, the Netherlands, used the string galvanometer ( the first practical electrocardiograph ) he invented in 1901.
6.
This device was much more sensitive than both the capillary electrometer Waller used and the string galvanometer that had been invented separately in 1897 by the French engineer Cl�ment Ader.
7.
Dutch physiologist Willem Einthoven developed the string galvanometer in the early 20th century, publishing the first registration of its use to record an electrocardiogram in a Festschrift book in 1902.
8.
Ground receiving stations translated pulse spacings back into voltages which were applied to a bank of string galvanometers to make an approximately continuous record of each channel on a moving roll of film.
9.
After his development of the string galvanometer, Einthoven went on to describe the electrocardiographic features of a number of acoustics, particularly heart sounds which he researched with Dr . P . Battaerd.
10.
Previous to the string galvanometer, scientists used a machine called the capillary electrometer to measure the heart's electrical activity, but this device was unable to produce results at a diagnostic level.
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