rying a little scale pan slides freely /up and down, Fig. 4. The wireis pushed home to the top of the frame and some of thesolution introduced, either by dipping the top or by painting it in with a aif ——— S.Sse brush. Then by adding weights the film can be pulled down like a delicate curtain until… … SA Wes a film, Fig. 5, the retardation the latter exercises on By particular management a hole of any desired size can be made in the side of a soap bubble. This is done its swing is quite striking. is dipped into the solution. A glass vessel full of hy- | Four of the rings may be mounted as a…
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