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Which toy part was used in the first electrocardiograph? Detailed answer

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Which toy part was used in the first electrocardiograph?

The first version of the design of the electrocardiograph was developed in 1887 by Augustus Waller, an employee of the London hospital, and included a platform from a toy railway. On it was a movable photographic plate on which the cardiogram was recorded. However, due to the weak sensitivity of the electrometer used, Waller's apparatus was not yet suitable for a full-fledged diagnosis.

Authors: Jimmy Wales, Larry Sanger

 Random interesting fact from the Great Encyclopedia:

What creatures are responsible for the color of Bloody Falls in Antarctica?

In Antarctica, Blood Falls emerges from the Taylor Glacier from time to time. The water in it contains ferrous iron, which, when combined with atmospheric air, oxidizes and forms rust. This is what gives the waterfall its blood-red color. However, ferrous iron in water does not occur just like that - it is produced by bacteria living in a reservoir isolated from the outside world deep under the ice. These bacteria have managed to organize a life cycle in the complete absence of sunlight and oxygen. They process the remains of organic matter, and "breathe" ferric iron from the surrounding rocks.

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