Show A MARVELOUS SIGHT Professor Dewar Makes the Fragments of a Soap Bubble Float In Air A frozen soap bubble broken in two and floating like an iridescent transparent transpar-ent eggshell on the surface of a vessel of liquid air was one of tho marvelous sights shown by Professor Dewar in a recent lecture lit the Royal institution on the effects of intense cold The investigation investiga-tion of this new field of science is developing devel-oping many wonderful bits of knowledge knowl-edge some of which are sure to be turned turn-ed to valuable practical account before long The pretty experiment spoken of which delighted the audience was quite simple The professor poured a few spoonfuls of liquid air into a glass vessel The intense in-tense cold caused by evaporation produce pro-duce i a miniature snowstorm in the atmosphere at-mosphere above the liquid The operator lowered the soap bubble on the end of a rod into the freezing atmosphere The bubble became darker The movements of the rainbow colored film grew slower It contracted somewhat in size and a moment later froze A slight movement brokn it from the rod in two pieces which floated for an hour gradually accumulating ac-cumulating a tiny snowdrift within precipitated pre-cipitated from the freezing air above London Standard I |