Popular Lectures on Scientific Subjects |
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Popular Lectures on Scientific Subjects Hermann Von Helmholtz,Edmund Atkinson No preview available - 2015 |
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action animals appear become blue bodies bright carbon carbonic acid changes chemical affinity chemical forces Col du Géant combination combustion compound compressed conception corresponding crystalline lens depends direction disc earth effect electrical electrical currents excited experiments external objects fact fall fibres field of vision friction fundamental tone Glace glacier Goethe hammer Hence human illuminated impression instrument investigation Johannes Müller kind labour light look machine mass means mechanical force melt Mer de Glace motion musical natural forces observation octave optic nerve organs oxygen peculiar perception phenomena physical sciences physiology pieces of ice pitch possible present pressure processes produced quantity of heat rays recognise result retina scientific seen sensations of sight senses separate sight snow space stereoscopic string surface temperature theory theory of colour tion upper partial tones velocity vibrations violet vis viva weight
Popular passages
Page 180 - And God said, Let there be light: and there was light. And God saw the light, that it was good: and God divided the light from the darkness. And God called the light Day, and the darkness he called Night. And the evening and the morning were the first day.
Page 143 - ... from the size of a pin's head to that of a pea ; scattered through a large body of sand or clay ; and in this state it is called by the Mandingoes sanoo munko,
Page 156 - The nature of the problem was quite calculated to entice poring brains, to lead them round a circle for years, deceiving ever with new expectations, which vanished upon nearer approach, and finally reducing these dupes of hope to open insanity. The phantom could not be grasped. It would be impossible to give a history of these efforts, as the clearer heads, among whom the elder Droz must be ranked, convinced themselves of the futility of their experiments, and were naturally not inclined to speak...