Correction [to "Direct-Reading Frequency Meter," by F. Guarnaschelli and F. Veechiacchi, Apr 1931, pp 660]

The authors of the paper "Direct-Reading Frequency Meter" published in the April, 1931, issue of the Proceedings have requested several additional paragraphs of material be published in elaboration of the sections entitled "Constants of the Device" and "Limits of Operation" (page 660), some details of which were not made sufficiently clear in the original translation. The additional material is presented here.