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Willem Einthoven (21 May 1860 – 29 September 1927) was a Dutch medical doctor and physiologist. He invented the first practical electrocardiograph (ECG or EKG) in 1895 and received the Nobel Prize in Physiology or Medicine in 1924 for it ("for the discovery of the mechanism of the electrocardiogram").
Boris Rosing (1869–1933), Russia – CRT television (first television system using cathode-ray tube on the receiving side) Guido van Rossum (born 1956), The Netherlands – Python (programming language) Michael Rothman, U.S. – UEFI
Graphical representation of Einthoven's triangle. 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 ...
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.
The E-meter is a simple psycho-galvanometer. It's got some increased sensitivity built into it and the myological reactions that you sometimes get in the galvanometer have been damped out by the circuitry, so that the mental reactions, the reactions of the spirit, on the body are emphasized and can be read more clearly. But that's simply the ...
Indeed, a galvanometer's needle measured a transient current (which he called a "wave of electricity") on the right side's wire when he connected or disconnected the left side's wire to a battery. [ 10 ] : 182–183 This induction was due to the change in magnetic flux that occurred when the battery was connected and disconnected. [ 7 ]
Even though potential difference is a scalar, the leads have a direction. For instance, in lead I, the the electrode attached to the left upper limb is it at a higher potential than the opposite arm, so a positive electrical disturbance (generated from the heart) will have to do positive work in travelling from the left to the right side.
Although large by today's standards, the machine was only rated at 12 kW; it turned relatively slowly since it had 144 blades. The connected dynamo was used either to charge a bank of batteries or to operate up to 100 incandescent light bulbs, three arc lamps, and various motors in Brush's laboratory. The machine fell into disuse after 1900 ...