ects and persons In 1884, before Aitken's researches, Sir Oliver Lodge it could follow the sun's movement, as in the case of in remote apartments of the same house or distant discovered that an electric spark discharge (which is a heliostat. houses. The system comprises, as may be supposed, now… … Diagram showing arrangement of mirrors through the atmosphere. , ness of musical notes or spoken words. Numerous at- and tnbes. tempts have been made to overcome this unpleasant The first decisive experiments with the flames were accompaniment. In none of the devices hitherto made on December 25th,…
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