Smithsonian miscellaneous collections (1947) (14767274562)

Identifier: smithsonianmisce1041947smit (find matches)
Title: Smithsonian miscellaneous collections
Year: 1862 (1860s)
Authors: Smithsonian Institution
Subjects: Science
Publisher: Washington : Smithsonian Institution
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries



Text Appearing Before Image:
oto-graph) in irregular bodies with cores darkened because of incomplete transformation. At right,two characteristic light plessite fields filled with rounded particles of taenite in clear kamacite,with traces of orientation. Near center, segregations of schreibersite along grain boundaries.The kamacite shows traces of gamma-alpha transformation figures. Inside the clear taeniteborders of the plessite fields there is a darkened band due to incomplete transformation.Picral 30 seconds x 50. 2. part of a band of incomplete transformation inside the border of a plessite field similarto those shown in figure 1. The dense gamma-alpha aggregate is largely unresolved, al-though in the lower (interior) part of the band fine white particles of taenite appear. Fartherinward (at bottom) fully transformed taenite has segregated in elongated particles. Thekamacite (above) shows gamma-alpha transformation figures. Picral 15 seconds x 367. SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 104, NO. 17, PL. 4
Text Appearing After Image:
New Westville Meteorite i, wedge-shaped bodies of taenite with cores darkened because of incomplete transformation.At top, a short lamella of taenite (clear) and three small bodies of schreibersite (gray). Picral30 seconds x 50. ... . . 2, an area near edge of slice showing invasion of hydroxide. Taenite is little affected. Picral30 seconds x 50. 3, an area near edge of slice strongly invaded by hydroxide, proceeding from the lett (sur-face) toward the right (interior) of the mass. At the left two kamacite bands and twoplessite fields are almost wholly oxidized. At the right the taenite borders of two plessitefields remain unchanged, the interior of the fields completely oxidized. Picral 30 seconds x 50.