EXISTING data on the refractivity of dry air as determined by various observers show disagreements which are larger than the errors which seem probable in many of the recent measurements. The ...

This article was originally published with the title “The Refractivity of Radium Emanation” in SA Supplements Vol. 69 No. 1776supp (January 1910), p. 37 doi:10.1038/scientificamerican01151910 ...