TAILIEUCHUNG - Fiber Optics Illustrated Dictionary - Part 76

The Fiber Optics Illustrated Dictionary - Part 76 fills a gap in the literature by providing instructors, hobbyists, and top-level engineers with an accessible, current reference. From the author of the best-selling Telecommunications Illustrated Dictionary, this comprehensive reference includes fundamental physics, basic technical information for fiber splicing, installation, maintenance, and repair, and follow-up information for communications and other professionals using fiber optic components. Well-balanced, well-researched, and extensively cross-referenced, it also includes hundreds of photographs, charts, and diagrams that clarify the more complex ideas and put simpler ideas into their applications context | Fiber Optics Illustrated Dictionary placed in circuit with a battery and either with a telephone or galvenometer sic . When a galvenometer is used signals can be made at the transmitting station by turning on or off the light. When the light is at its maximum the needle will swing to one side and when at its minimum it will swing to the other. The needle of the galvenometer can be caused to strike against suitable stops and thus open or close another circuit containing a Morse register or other telegraphic apparatus. When the telelphone is employed at the receiving station audible sounds can be occasioned in the telephone by varying the intensity of the light at the distant station for instance at the transmitting station let these be screens placed in front of the light each screen containing a multitude of small holes or narrow slits. It is evident that when the screens are placed so that the slits in the one coincide with the slits in the other the light will pass freely through these slits to the receiving station. Avery slight displacement however of one of the screens would suffice to shut off completely the whole light. I attach the movable screen to a metallic plate or disc arranged to be set in vibration by the voice of the speaker. A year later in February 1880 Bell wrote an excited letter to his father announcing not only the birth of Mabel s child but also of his own child as he called his new invention. I have heard articulate speech produced by sunlight I have heard a ray of the sun laugh and cough and sing The dream of the past year has become a reality - the Photophone is an accomplished fact. I am not prepared at present to go into particulars and can only say that with Mr. Tainter s assistance I have succeeded in preparing crystalline selenium of so low a resistance and so sensitive to light that we have been He enabled to perceive variations of light as sounds in the telephone. In this way I have been able to hear a shadow and I have even .

• Kĩ thuật Viễn thông
• Từ điển tranh viễn thông
• sợi quang học
• sợi dẫn quang
• công nghệ viễn thông
• thông tin kỹ thuật cơ bản để nối cáp quang