A unit of wavenumber, proposed in 1951.¹ It is equal to the number of waves in a centimeter. The balmer is named for J. J. Balmer (1825-1898), the spectroscopist for whom the Balmer lines are also named.

1. W. Bladergroen.
A Unit of Wave-number.
Nature, number 4261, volume 167, page 1075 (June 30, 1951).

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