Clinical electrocardiography / by Sir Thomas Lewis.

  • Lewis, Thomas, Sir, 1881-1945.
Date:
1924
Catalogue details

Licence: In copyright

Credit: Clinical electrocardiography / by Sir Thomas Lewis. Source: Wellcome Collection.

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    by its makers, or to my book, The Mechanism, and Graphic Registration of the Heart Beat ; but familiarity with galvano- metric outfits can be gained best by handling the instruments. The galvanometer is connected to the patient through some special form of switchboard. Students of electro¬ cardiography utilise switchboards of different patterns, more GS Fig. 3. A switchboard arranged as a group of simple circuits and connected to the galvanometer. or less complicated ; those supplied for clinical use are arranged to insure speedy and accurate work ; the actual switches are therefore few in number but the wiring is intricate. I propose to describe a scheme which may be drawn as a group of simple circuits. This scheme, though serviceable, is no longer in clinical use, because the number of the keys