IN a test for the liquid absorption of light powders, water is gradually added to the powdor in a hard-glass thick-walled test-tube fitted with a rubber bung. This is shaken between additions by ...

Small rim glass (wine glass works best) Baby oil. Any brand. You will need enough to fill the glass. Glass test tube Parent supervision Note: If you do not have any glass test tubes, you can use a ...

IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. See Negs SIA2011-0179 and ...