What is Electricity
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In our eReader you can find the full English version of the book. Read What is Electricity Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book What is Electricity
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To quickly assess the difficulty of the text, read a short excerpt:
This does not seem at first sight more improbable than the feat of speaking by means of the waves of heat, which is accomplished by Graham Bell's photophone.
The following interesting modification of this in- strument has lately come yS N \. A to my attention : /t / A tube of lampblack, T (Fig. 43), is placed at the focus of a large para- pio. 43, bolic mirror, and a speak- ing tube, or rather a listening tube, is connected with it.
At the distance of half a mile a reflecting mirror is supporte...d so that the rays of the sun shall be reflected to the tube, T. The voice of a speaker at A impinging against the mirror can be thus heard, and conversation carried on through the air. The heat rays are thrown into vibration by means of the speaker's voice upon the lampblack, and the air in the speaking tube is 238 WHAT IS ELECTRICITY!
thus tuned to his voice. Here we have a transf orma- tion of sound movements into heat movements and a retransformation into sound waves. Can we not trans- form the sound waves of the voice into light waves, so that a speaker can cause light to appear at a great dis- tance from him ?
What to read after What is Electricity?
You can find similar books in the "Read Also" column, or choose other free books by John Trowbridge to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
This does not seem at first sight more improbable than the feat of speaking by means of the waves of heat, which is accomplished by Graham Bell's photophone.
The following interesting modification of this in- strument has lately come yS N \. A to my attention : /t / A tube of lampblack, T (Fig. 43), is placed at the focus of a large para- pio. 43, bolic mirror, and a speak- ing tube, or rather a listening tube, is connected with it.
At the distance of half a mile a reflecting mirror is supporte...d so that the rays of the sun shall be reflected to the tube, T. The voice of a speaker at A impinging against the mirror can be thus heard, and conversation carried on through the air. The heat rays are thrown into vibration by means of the speaker's voice upon the lampblack, and the air in the speaking tube is 238 WHAT IS ELECTRICITY!
thus tuned to his voice. Here we have a transf orma- tion of sound movements into heat movements and a retransformation into sound waves. Can we not trans- form the sound waves of the voice into light waves, so that a speaker can cause light to appear at a great dis- tance from him ?
What to read after What is Electricity?
You can find similar books in the "Read Also" column, or choose other free books by John Trowbridge to read onlineMoreLess
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