 | Science - 1880 - 1188 pages
...a battery and telephone. We have found it advisable to protect the mirror by placing it out of the focal point, and by passing the beam through an alum...the top of the Franklin School House in Washington, and the sensitive receiver was arranged in one of the windows of my laboratory, 1825 L Street, at a... | |
 | Science - 1880 - 900 pages
...which is placed a sensitive selenium-cell, connected in a local circuit with a battery and telephone. A large number of trials of this apparatus have been...instrument, which was placed on the top of the Franklin sehoolhouse in Washington, and the sensitive receiver was arranged in one of the windows of my laboratory,... | |
 | James Samuelson, Henry Lawson, William Sweetland Dallas - Science - 1880 - 442 pages
...which is placed a sensitive selenium cell, connected in a local circuit with a battery and telephone. A large number of trials of this apparatus have been...instrument, which was placed on the top of the Franklin schoolhouse in Washington, and the sensitive receiver was arranged in one of the windows of my laboratory,... | |
 | Science - 1880 - 922 pages
...selenium-cell, connected in a local circuit with a battery and telephone. A large number of trialof this apparatus have been made with the transmitting...recent of these experiments. Mr. Tainter operated the transmittici.' instrument, which was placed on the top of the Franklin schoolboiiM in Washington, and... | |
 | American Association for the Advancement of Science - 1881 - 898 pages
...placing it out of the focal point, and by passing the beam through an alum cell, as shown in Fig. G. A large number of trials of this apparatus have been...that sounds could not be heard directly through the nir. In illustration, I shall describe one of the most recent of these experiments. Mr. Ta'mter operated... | |
 | John Michels - Science - 1880 - 364 pages
...selenium cell, connected in a local circuit with a battery and telephone. A large number of tiials of this apparatus have been made, with the transmitting...heard directly through the air. In illustration, I (hall describe one of the most recent of these experiments. Mr. Tainter operated the transmitting instrument,... | |
 | George Iles - 1906 - 594 pages
...such as silvered mica or microscope glass, against the back of which the speaker's voice is directed. "A large number of trials of this apparatus have been...sounds could not be heard directly through the air. In a recent experiment Mr. Tainter operated the transmitting instrument, placed on the top of the Frahklin... | |
 | George Iles - Inventions - 1906 - 586 pages
...such as silvered mica or microscope glass, against the back of which the speaker's voice is directed. "A large number of trials of this apparatus have been...sounds could not be heard directly through the air. In a recent experiment Mr. Tainter operated the transmitting instrument, placed on the top of the Franklin... | |
 | George Iles - Inventions - 1906 - 604 pages
...directly through the air. In a recent experiment Mr. Tainter operated the transmitting instrument, placed on the top of the Franklin School House in Washington, DC ; the receiver being arranged in a window of my laboratory, at a distance of 213 metres. Upon placing... | |
 | Pharmacy - 1881 - 1122 pages
...which is placed a sensitive selenium cell, connected in a local circuit with a battery and telephone. A large number of trials of this apparatus have been...instrument, which was placed on the top of the Franklin schoolhouse in Washington, and the sensitive- receiver was arranged in one of the windows of my laboratory,... | |
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A large number of trials of this apparatus have been made with the transmitting and receiving instruments so far apart that sounds could not be heard directly through the air. In illustration, I shall describe one of the most recent of these experiments.... 
