To forty different points in her empire sped the electric message. In sixteen minutes a reply came from Ottawa in Canada; then one by one answers came in from more remote provinces; until, before the Queen reached London Bridge, the Cape of Good Hope, the Gold Coast of Africa, and the great continent of Australia had sent responses to her message.
CHAPTER VII.
THE TELEPHONE.
When the telegraph was invented, years ago, it seemed little less than a miracle that a message could be dictated in one city and received almost instantaneously in another city far distant from the sender. Scientists, however, began at once on the invention of something more wonderful. The telegraph lacks in one respect. By it messages must be sent exactly as dictated and cannot be corrected until the reply is received. In a sense, sending and receiving messages by telegraph is a form of conversation, but a conversation at arm's-length. To carry on a real conversation at long distances would be a great advance. An instrument prepared for this purpose would be called a telephone.
In 1875 Alexander Graham Bell invented the first successful electric telephone. This was exhibited at Salem, Massachusetts, and at Philadelphia at the Centennial Exhibition, and a patent for it was obtained. The apparatus of Bell's telephone is very simple, and practically consists of four parts: the battery, the wire which runs from the speaker to the hearer, a diaphragm against which the vibrations of the air produced by the voice of the speaker strike, and another diaphragm at the other end of the wire which reproduces similar vibrations and sends them to the ear of the listener. Elisha Gray of Boston made a similar invention and applied for a patent two hours after Bell's application was filed. The invention of Mr. Bell has proved a decided success. All telephonic operations, since this invention, have been based upon the instrument which he patented in 1876.
Mr. Bell was the son of a distinguished Scotch educator, Alexander Melville Bell. The father is noted for the invention of a new method for improving impediments in speech. This system of instruction is called "Bell's Visible Speech." It is used with great success in teaching deaf-mutes to speak.
