Abstract
Based on early experiments, a simple closed wet cell has been designed to retain volatile material in the vacuum of the transmission electron microscope. A description is given of the procedure for making the triple film windows for retaining liquid in the cell yet permitting good electron beam penetration and the clamping arrangement of the windows to seal the edge. The assembly and use of the cell are described. Electron micrographs are shown of chromium hydroxide spheres suspended in water that indicate a mechanism of formation of the spheres.

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