FIRST report of the Committee on Ballistocardiographic Terminology.

The Bane Line. The base line is the neutral line of the record, the horizontal line the record takes late in diastole if the pulse rate is slow enough. Fn faster hearts, the base line can be approximated by placing a horizontal line such that the areas of the late cliastolic deflections above and below it are equal. In records secured by electrical amplification the base line can be obtained by rapidly turning down the sensitivity until the amplitudes become negligible, provided this has had no effect on centering. The ballistic waves diverge from the base line in opposite directions.