Interesting experiment results in pictures made of sand on pieces of glass.
"Try this little sound experiment one winter evening. All you need is a glass plate or two, a violin bow and some fine sand."
C/U of sand being sprinkled onto a piece of glass. The violin bow is drawn down the side of the glass which makes it wobble and move the sand. The bow is applied to various parts of the glass and the sand moves and makes a pattern on the glass. "All sorts of pretty designs are possible - just vary the shape or thickness of the glass." A star shape is produced on a round piece of glass. More shapes are made on a hexagonal piece of glass.
Was an item in Pathe Pictorial issue number 662.
Note: flash-frame intertitles.