Magic Lantern, Experiment with the 62 Glasses to paint 63 solar 60 Magnetism, Experiments in 70 Memory, artificial 158 Microscope, Experiment for the 145 Mirror, Magician's 124 perspective 124 distorting 126 oracular 152 Mirrors, magical 53 deforming 123 igniting 125 Money augmented by optical Illusion 15 melted in a Walnut-shell 40 Mortars, in Fire-works 184 Neptune in his Chariot 198 Number, to tell any, privately fixed on 45 without asking questions 45 divisible by 9, &c. 55 Numbers, to find the difference of two, &c. 56 Objects, three, discernible only with both Eyes 15 Oil upon Water, and Water upon Oil, curious Effects of 161 and Water, Experiments with 161 Opaque Bodies, seemingly transparent 121 Box made transparent 130 Opera-glass, diagonal 129 Oracle, inanimate 61 Orrery, magnetic 72 electrical 92, 99