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Show INFLUENCE OF CHEMICAL VAPORS ON THE CRYSTAL HABIT OF SUBLIMATED ICE Summary of Experimental Results Investigators and Experimental Methods A. LaChapelle &. Giddings; depth hoar generated by artificially-maintained temperature gradients in natural snow samples B* Schaefer: seeded artificial supercooled clouds C. Nakaya, Hanajima & Muguruma: grew single crystals on fiber suspended in flow of supersaturated vapor D. Hallet & Mason: ditto, diffusion cloud chamber E. Kobayashi & Higuchi: diffusion cloud chamber, crystals deposited on glass slide. Key to Symbols (-) slight effect (*) strong effect 0 no effect 1 inhibition of sublimation 2 acceleration of sublimation 3 growth favored along principal crystal axis ( needles & columns) 4 growth favored in basal plane ( plates and dendritic forms) 5 transition, combination or irregular forms ( a) strong tendency to form 90° corners ( b) triangles predominate, hexagonal habit tends to disappear ( c) crystal habit varies widely with vapor concentration ' d) formed scrolls or cups, as in natural depth hoar Investigator ChenrLcal Vapor methyl alcohol ethyl alcohol benzyl alcohol N- acytl alcohol N- butyl alcohol 2- octanol 1,3- dj bromo- 2- propanol methyl N- butyl ketone methyl ethyl ketone A 1, 4- 0, 3- 2, 3* 3- l-. 3- i B 0 0 ( d) C 4 4 > y D E ( c) |