Soap Bubbles
and the Forces which Mould Them

viii PREFACE. which go all right at once. Some are so simple that no help can be wanted, while some will probably be too difficult, even with assist- ance ; but to encourage those who wish to see for themselves the experiments that I have described, I have given such hints at the end of the book as I thought would be most useful. I have freely made use of the published work of many distinguished men, among whom I may mention Savart, Plateau, Clerk Maxwell, Sir William Thomson, Lord Ray- leigh, Mr. Chichester Bell, and Prof. Rucker. The experiments have mostly been described by them, some have been taken from journals, and I have devised or arranged a few. I am also indebted to Prof. Riicker for the use of various pieces of apparatus which had been prepared for his lectures.