Method for recording flow boundary layers in liquid media

A method for recording flow boundary layers in liquid media by photographic means, comprising:

• (a) providing a solid planar surface;
• (b) affixing to said surface a photographic sheet film containing silver halide in a gelatin layer;
• (c) exposing said surface, having said sheet film thereon, to a flowing liquid medium having dissolved therein an agent capable of diffusing into the gelatin layer of said photographic sheet and dissolving silver halide therefrom;
• and
• (d) thereafter converting the silver halide remaining in said photographic sheet film, after said flow has ceased, to elemental silver to provide in said film sheet an image of the boundary layers of flow over said surface.

A method for recording flow boundary layers in liquid media by photographic means, comprising:

• (a) providing a solid planar surface;
• (b) affixing to said surface a photographic sheet film containing silver halide in a gelatin layer;
• (c) converting the silver halide in said sheet film to elemental silver;
• and
• (d) exposing said surface, having said sheet film thereon, to a flowing liquid medium having dissolved therein an agent capable of diffusing into the gelatin layer of said sheet film and oxidizing and dissolving silver contained therein such that silver remaining in said sheet film, after said flow has ceased, provides an image of the boundary layers of flow over said surface.

A method for recording flow boundary layers in liquid media by photographic means, comprising:

• (a) providing a solid planar surface;
• (b) affixing to said surface a photographic sheet film containing silver halide in a gelatin layer;
• and
• (c) exposing said surface, having said sheet film thereon, to a flowing liquid medium having dissolved therein agents capable of reducing silver halide in said film to silver and dissolving from said film any remaining silver halide.