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April 1929


Arch Otolaryngol. 1929;9(4):442-443. doi:10.1001/archotol.1929.00620030464013

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The audiogram recorded in sensation units on the cards provided with the 2A audiometer gives a somewhat unsatisfactory picture of the functional loss of hearing for air conduction. A record made in percentage of loss gives a clearer idea of the proportionate loss of hearing for each note as related to the whole range of hearing.

It is true that this conversion can be made by means of a table showing the percentage of loss of hearing equivalent to the loss in sensation units, but the labor and possibility of error in making such a conversion preclude its frequent use.

I have worked out a chart in which the readings of the audiometer can be recorded at once in percentage almost as quickly as they are now recorded in sensation units. These charts are now available for the conveniences of those who prefer this picture.

Chart 1 shows the

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