 It is a kind of tent surrounded by opaque curtains, and having at its top a revolving lantern, containing a lens with its axis horizontal, and a mirror placed behind it at a slope of 45°, to reflect the transmitted light downwards on to a sheet of white...  Elementary Treatise on Natural Philosophy - Page 1017by Augustin Privat-Deschanel - 1882Full view - About this book
 | Augustin Privat-Deschanel - Physics - 1873 - 298 pages
...a lens. This is the principle of the camera obscura, one form of which is represented in Fig. 685. It is a kind of tent surrounded by opaque curtains,...desired. It is still better to combine lens and mirror in Fig. 686.— ObjectiTe of C«merm. Fig. «87.— Photographic Camera. from external objects are first... | |
 | 1901 - 530 pages
...slope of 45') to the glass plate N, where they form an image that may lie traced. Another arrangement is a kind of tent surrounded by opaque curtains, and...at a slope of 45", to reflect the transmitted light down, 47 CAMERINO wards on the paper. It is still better to combine lens and mirror in one by using... | |
 | Frederick Converse Beach, George Edwin Rines - Encyclopedias and dictionaries - 1912 - 902 pages
...seaside resorts and other places of amusement, the camera obscura consists of a small building or of a tent surrounded by opaque curtains, and having at...a slope of 45°, to reflect the transmitted light downward on a sheet of white paper lying on the top of a table. Images of external objects are thus... | |
 | Charles Morris - Encyclopedias and dictionaries - 1917 - 544 pages
...slope of 45° ) to the glass plate N, where they form an image that may be traced. Another arrangement is a kind of tent surrounded by opaque curtains, and...45°, to reflect the transmitted light downwards on the paper. It is still better to combine lens and mirror in one by using a glass of peculiar shape,... | |
 | Encyclopedias and dictionaries - 1918 - 832 pages
...seaside resorts and other places of amusement, the camera obscura consists of a small building or of a tent surrounded by opaque curtains and having at its...a slope of 45°, to reflect the transmitted light downward of a sheet of white paper lying on the top of a central table. Images of external objects... | |
 | Charles Morris - Encyclopedias and dictionaries - 1921 - 506 pages
...slope of 45°) to the glass plate N. where they form an image that may be traced. Another arrangement is a kind of tent surrounded by opaque curtains, and...45°, to reflect the transmitted light downwards on the paper. It is still better to combine lens and mirror in one by using a glass of peculiar shape,... | |
 | Thomas Edward Finegan - Encyclopedias and dictionaries - 1922 - 530 pages
...curtains, and having at its top a revolving lantern, containing a lens with its axis horizontal, and q mirror placed behind it at a slope of 45°, to reflect the transmitted lignt downwards on the paper. It is still better to combine lens and mirror in one by using a glass... | |
 | Frederick Converse Beach, George Edwin Rines - Encyclopedias and dictionaries - 1911 - 892 pages
...seaside resorts and other places of amusement, the camera obscura consists of a small building or of a tent surrounded by opaque curtains, and having at...a slope of 45°, to reflect the transmitted light downward on a sheet of white paper lying on the top of a table. Images of external objects are thus... | |
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