| 41. | The company built telescopes, spectroscopes and photometers one of Steinheil's inventions, used to measure brightness.
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| 42. | Photometers are sensors that do not usually produce images but can read with great accuracy the intensity and duration of light.
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| 43. | By comparison, measurements with Photometer " ( MIPS ) give a diameter of kilometers and a geometric albedo of.
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| 44. | He also devised a specialized photometer to determine the smallest amount of light that will permit an object to be visible.
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| 45. | The first instruments of the observatory were a 15-cm Unitron telescope, a Foucault pendulum and an Iris photometer.
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| 46. | For example, there was a photoelectric photometer fed by a 16 inch telescope with a six-position filter wheel.
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| 47. | Frustrated by its use, he worked with F . C . Brown to develop a photometer based on a selenium cell.
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| 48. | Mims first LED sun photometer is still in use ( he is shown holding it in the 26th anniversary photo above ).
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| 49. | The coming of Comet Halley in 1910 allowed Stebbins, in May, to use his selenium photometer to study the comet.
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| 50. | Why the reading when I covered the photometer ?-- talk ) 00 : 28, 9 June 2009 ( UTC)
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