Scientific amusements . resting subjects. The dance of the paperpuppets, and the magnetised magician, are examples ofthese. Chemistry without a laboratory introduces us to theair and its elements, the formation of salts, instantaneouscrystallisation, the Tree of Saturn, the produ^;tion ofgas, and the graven eggs. Mathematical games, as here expounded, are capableof affording no small amusement. Marjy of the bestmechanical toys invented in recent years are describedin Chapter XL, such as the acrobatic ape, the magic glass,the fantoccini top, the mechanical paper bird, the magicpicture with thre
Scientific amusements . resting subjects. The dance of the paperpuppets, and the magnetised magician, are examples ofthese. Chemistry without a laboratory introduces us to theair and its elements, the formation of salts, instantaneouscrystallisation, the Tree of Saturn, the produ^;tion ofgas, and the graven eggs. Mathematical games, as here expounded, are capableof affording no small amusement. Marjy of the bestmechanical toys invented in recent years are describedin Chapter XL, such as the acrobatic ape, the magic glass,the fantoccini top, the mechanical paper bird, the magicpicture with three faces, and the mechanical fly. Everyone may take his friends portrait by the silhouette processgiven on pages 85, 86, while the formation of typica/ Vlll PREFACE. portrait sketches by the combination of implements usedin any given craft is amusingly shown on pages it will be evident that a vast amount of amusement,combined with instruction, is to be got out of the attentiveperusal of the following CONTENTS. Chapter i.—properties of bodies. PAGE STRENGTH — ELASTICITY — POROSITY —PERMEABILITY—RE-SISTANCE OF SUBSTANCES—HARDNESS—CENTRIFUGALFORCE—THE PRINCIPLE OF INERTIA .... I CHAPTER EQUILIBRIUM OF BODIES. THE CENTRE OF GRAVITY 28 CHAPTER III.—DENSITY, HYDROSTATICS, ETC. HYDROSTATICS—THE MOVEMENTS OF GASES—RESISTANCE OF THE AIR • 38 CtlAPTER IV.—PRESSURE OF THE AIR. PRESSURE OF THE AIR—EXPERIMENTS WITH AIR—ASRONAUTICS 56 CHAPTER v.—HEAT. THE CONDUCTIBILITY OF METALS—DILATATION OF BODIES BY HEAT .... 66 X CONTENTS. CHAPTER VI.—LIGHT, OPTICAL ILLUSIONS, ETC. PAGV REFRACTION—VISIONAND OPTICAL ILLUSIONS—PERSISTENCE OF IMPRESSIONS ON THE RETINA CHAPTER XI. MECHANICAL TOYS, ETC. 73r\ CHAPTER VII. ELEpTRICITY AND MAGNETISM. . , , . .88 CHAPTER VIII. CHEMISTRY WITHOUT A LABORATORY . „ . >q2 CHAPTER IX.—MATHEMATICAL GAMES. THE DICE TRICK , .... 104 CHAPTER X. NATURAL SCIENCE IN THE COUNTRY . , , . U3 »
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