| 31. | All comets were discovered whilst examining photographic plates taken by the Bache or Metcalf telescopes.
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| 32. | In 1880 George Eastman began to manufacture gelatin dry photographic plates in Rochester, New York.
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| 33. | He measured the magnitudes of about 130 quasars from a large number of photographic plates.
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| 34. | As the slit passed the lens, it " wiped " the exposure onto the photographic plate.
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| 35. | After returning to his home institute in Kiev, Churyumov examined all the photographic plates more closely.
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| 36. | Nancy Van Meter makes cyanotypes, created by laying an object directly on a sensitized photographic plate.
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| 37. | He asked her to place her hand on a photographic plate and switched on the machine.
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| 38. | The star was then located on photographic plates from the Palomar Sky Survey taken in 1951.
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| 39. | Marsden said an early priority will be to search photographic plates for evidence of the object.
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| 40. | Subsequent exposures on the same photographic plate are made while the object is subjected to some stress.
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