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Page 35 - It may also be defined as the sine of the angle of incidence divided by the sine of the angle of refraction, as light passes from air into the substance.
Page 104 - In its case the sine of the angle of incidence is to the sine of the angle of refraction...
Page 160 - ... a common candle ; quartz, the sapphire, magnesia, lime, all entered into fusion ; fragments of diamond and points of charcoal and plumbago rapidly disappeared and seemed to evaporate in it, even when the connection was made in a receiver exhausted by the air-pump ; but there was no evidence of their having previously undergone fusion.