ELECTRICAL PROGRESS

Radio Record, Volume I, Issue 26, 13 January 1928, Page 16

ELECTRICAL PROGRESS

A WONDERFUL STORY. When we consider what radical] changes have taken place in this world of ours in the last few hundred years, is it any wonder that we sometimes try to look ahead and visualise what will have taken place in few hundred years’ time? The use of electricity for wire communication took many advancing steps during the nineteenth century. Morse produced the telegraph in 1835, but it was bettered the next year by Wheatstone, an Englishman, who developed the electro-magnetic telegraph. Gintl, an Austrian, found out how to send two messages simultaneously over the same wire in 1835, and in 1874 ‘Thomas A. [Edison demonstrated quadruplex telegraphy, thus doubling the country’s -wire’s capacity without stringing an additional mile of line. In 1895 Preece in England went still further when he invented telegraphy through the air by the use of low frequency electric waves. Marconi came along next vear with high "frequency, long distance Wwaves-now known as wireless. | In 1879 [Tidison made the first incandescent lamp, thus giving electric light to the world. The filament was a delicate thing of burnt thread that broke at the slightest jar, but it grew ted-hot and gave off a little light iufide its glass globe. After that all sorts of filaments were used, vear by year, until the industry learned how to make sturdy ones ‘of tungsten. The first electric carbon 1

lamp, known as the are lamp, was invented by Brush in 1879, and soon came into common use for street lighting. In 1876 Alexander Graham Bell invented the telephone. 1927 saw the first Empire broadcast. So the world goes on; inventions revolutionise the world, and are later improved on to such an extent that the original method becomes obsolete, whilst its principles make other men famous.