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November 13, 1948


JAMA. 1948;138(11):820. doi:10.1001/jama.1948.62900110008009b

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Manufacturer: Sanborn Company, 39 Osborn Street, Cambridge 39, Mass.

The Sanborn Instomatic Cardiette is a portable electrocardiograph weighing 10.4 Kg. (23 pounds). In the recording mechanism a beam of light is cast onto a strip of sensitized paper 5.75 cm. (2 1/4 inches) wide. The galvanometer deflection is indicated by a shadowed line moving across the paper. This results in a white line 2 mm. wide against a dark background on the developed photographic record. Narrow white lines also mark the strip into 1 mm. squares, every fifth one of which is slightly wider. A 30 meter (100 foot) roll of sensitized paper is contained in a removable magazine equipped with a red window to permit examination of the paper supply. A slot, with hinged cover, allows marking on the back of the record.

The paper is pulled past the recording point and into a removable light tight container which

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