| Harvard University. Board of Overseers - 1877 - 298 halaman
...an ordinary stand. This is avoided by observing them in the meridian as with a transit instrument. The photometer consists of a horizontal telescope...eye-stop. The star to be measured is thus seen in the same field with the pole star, with the same aperture and magnifying power. Many of the errors... | |
| Harvard University - 1877 - 1016 halaman
...an ordinary stand. This is avoided by observing them in the meridian as with a transit instrument. The photometer consists of a horizontal telescope...is reflected into one object-glass, and the star to lie measured into the other. The cones of light are made to coincide by a double-image prism, the extra... | |
| 1879 - 642 halaman
...an ordinary stand. This is avoided by observing them iu the meridian as with a transit instrument. The photometer consists of a horizontal telescope...eye-stop. The star to be measured is thus seen in the same field with the pole star, with the same aperture and magnifying power. Many of the errors... | |
| 1880 - 756 halaman
...loss of time in identifying the objects, they are observed in the meridian with a photometer which consists of a horizontal telescope pointing to the...eye-stop. The star to be measured is thus seen in the same field with the pole star, with the same aperture and magnifying-power. An assistant is required... | |
| Royal Astronomical Society - 1880 - 740 halaman
...an ordinary stand. This is avoided by observing them in the meridian as with a transit instrument. The photometer consists of a horizontal telescope...made to coincide by a doubleimage prism, the extra image being cut off by an eye-stop. The star to be measured is thus seen in the same field with the... | |
| Royal Astronomical Society - 1880 - 704 halaman
...an ordinary stand. This is avoided by observing them iu the meridian as with a transit instrument. The photometer consists of a horizontal telescope...to be measured into the other. The cones of light aro made to coincide by a doubleimage prism, the extra image being cut off by an eye-stop. The star... | |
| 1880 - 662 halaman
...an ordinary stand. This is avoided by observing them in the meridian as with a transit instrument. The photometer consists of a horizontal telescope...two objectives. By means of two prisms mounted in fixmt of the telescope, the Pole Star is reflected into one object-glass and the star to be measured... | |
| 1880 - 850 halaman
...patient anil persevering. The photometer employed in measuring the light is a horizontal telescope with two objectives. By means of two prisms mounted in front of the telescope, the pole-star is reflected into one object glass, and the star to be measured into the other. The cones... | |
| Smithsonian Institution. Board of Regents - 1881 - 806 halaman
...by Prof. PICKEBING during the past year in the determination of the light of all the stars visible to the naked eye at Cambridge (Mass.) As most of these...eye-stop. The star to be measured is thus seen in the same field with the pole star, under exactly the same conditions. To determine the relative transpar.... | |
| Royal Dublin Society - 1880 - 804 halaman
...equal area of the nebula. The light of the nebulte may accordingly be described in stellar magnitudes. As most of these stars would be very troublesome to...eye-stop. The star to be measured is thus seen in the same field with the pole star, under exactly the same conditions. To determine the relative transparency... | |
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