| 41. | The photograms or photographic plates are oriented by measured passpoints in the field or on the building.
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| 42. | The collodion process was used on a glass photographic plate to capture an image on the plate.
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| 43. | In the early days of the 20th century he used photographic plates, like all other serious photographers.
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| 44. | The seated man is taking a radiograph of his hand by placing it on a photographic plate.
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| 45. | The manufacture of photographic plates has been discontinued by Kodak, Agfa and other widely known traditional makers.
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| 46. | The world's astronomical archives contain more than 2 million photographic plates, some more than a century old.
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| 47. | His early work was focused on astrometrics, particularly in the examination of photographic plates to measure stellar parallax.
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| 48. | In that time, he had a small laboratory where he could develop photographic plates or build radio equipment.
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| 49. | He spearheaded a revolution in which astronomers went from using photographic plates to much more efficient electronic detectors.
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| 50. | But until the 1990s, most observations were recorded on photographic plates and so are not available in digital form.
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