Show IMPROVED TE TELEPHONE LEPHaNE A simple way of making telephone conversations more audible has been invented by herr petersen a vank manager of denmark on the principle that sound is more readily beadil transmitted through rarefied air he has cr 14 nn an apparatus to warm the whereby the air in it becomes thinner and the bound sound is intensified professor hannover of the danish government telephone te ain station who has his made extensive experiments with pe ter dersons er sons apparatus saya in his report hat that the increase inc of sound obtained is re remarkably markab telephone conversations between copenhagen and nyk dobing a distance of some 75 milea could be clearly followed some distance aay from the instrument the the inventor has applied for patents in in different countries |