 | 1873 - 508 pages
...at an angle of 45°. In a direction at right angles to that of the slit, an opening of about -flinch was left between the pieces of glass for the passage...a silvering solution. In order to ensure that the induction-spark should always preserve the same position relatively to the mirror, a piece of sheet... | |
 | 1873 - 524 pages
...slit at an angle of 4 i°. In a direction at right angles to that of the slit, an opening of about ^inch was left between the pieces of glass for the...a silvering solution. In order to ensure that the induction-spark should always preserve the same position relatively to the mirror, a piece of sheet... | |
 | 1873 - 1044 pages
...spectra of comparison, one appearing above and the other below it. As the reflecting surfaces are •bout 0*5 inch from the slit, and the rays from the spark...a silvering solution. In order to ensure that the induction-spark should always preserve the same position relatively to the mirror, a piece of sheet... | |
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In a direction at right angles to that of the slit, an opening of about -^ inch was left between the pieces of glass for the passage of the pencils from the object-glass. By means of this arrangement the spectrum of a star is seen accompanied by two spectra... 
