Search results
Results from the WOW.Com Content Network
A string galvanometer is a sensitive fast-responding measuring instrument that uses a single fine filament of wire suspended in a strong magnetic field to measure small currents. In use, a strong light source is used to illuminate the fine filament, and the optical system magnifies the movement of the filament allowing it to be observed or ...
Willem Einthoven was born in Semarang on Java in the Dutch East Indies (now Indonesia), the son of Louise Marie Mathilde Caroline de Vogel and Jacob Einthoven. [2] His father, a doctor, died when Willem was a child. His mother returned to the Netherlands with her children in 1870 and settled in Utrecht.
The electrocardiograph was impractical to use until Willem Einthoven, a Dutch physiologist, innovated the use of the string galvanometer for cardiac signal amplification. [2] Significant improvements in amplifier technologies led to the usage of smaller electrodes that were more easily attached to body parts. [ 1 ]
Einthoven's triangle is an imaginary formation of three limb leads in a triangle used in the electrocardiography, formed by the two shoulders and the pubis. [1] The shape forms an inverted equilateral triangle with the heart at the center. It is named after Willem Einthoven, who theorized its existence. [2]
For example even the date that Einthoven invented the string galvanometer is wrong. I believe the authors have simply reworked secondary publications and have not done the primary research of the dates and people involved in the early years of electrocardiography.
An early D'Arsonval galvanometer showing magnet and rotating coil. A galvanometer is an electromechanical measuring instrument for electric current.Early galvanometers were uncalibrated, but improved versions, called ammeters, were calibrated and could measure the flow of current more precisely.
1887 – Willem Einthoven invents electrocardiography (ECG/EKG) [100] [101] 1890 – Emil von Behring discovers antitoxins and uses them to develop tetanus and diphtheria vaccines. 1895 – Wilhelm Conrad Röntgen discovers medical use of X-rays in medical imaging
Gernsback created his preferred term for the emerging genre, "scientifiction", in 1916. [12] He is sometimes also credited with coining "science fiction" in 1929 in the preface of the first Science Wonder Stories , [ 13 ] [ 9 ] although instances of "science-fiction" (mostly, but not always, hyphenated) have been found as far back as 1851, [ 14 ...