 | James Samuelson, William Crookes - 1869 - 700 pages
...comparison to overlap for a little distance the spectrum of the star. This state of things greatly assisted the eye in forming a judgment as to the absolute coincidence or not of a line in a star with that of a substance compared with it. The comparisons, even when effected... | |
 | 1869 - 692 pages
...comparison to overlap for a little distance the spectrum of the star. This state of things greatly assisted the eye in forming a judgment as to the absolute coincidence or not of a line in a star with that of a substance compared with it. The comparisons, even when effected... | |
 | Royal Society (Great Britain) - 1872 - 724 pages
...slit at an angle of 45°. 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...silvering solution. " In order to ensure that the induction-spark should always preserve the same position relatively to the mirror, a piece of sheet... | |
 | Royal Society (Great Britain) - 1872 - 728 pages
...slit at an angle of 45°. In a direction at right angles to that of the slit, an opening of about -j^ inch was left between the pieces of glass for the...silvering solution. '" In order to ensure that the induction-spark should always preserve the same position relatively to the mirror, a piece of sheet... | |
 | Royal Society (Great Britain) - 1872 - 750 pages
...slit at an angle of 45°. 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...floating them upon the surface of a silvering solution. T- In order to ensure that the induction-spark should always preserve the same position relatively... | |
 | Sir Norman Lockyer - 1872 - 574 pages
...reflecting surfaces are about о '5 inch from the slit, and the rays from the spark are divergent, the li^ht reflected from the pieces of glass will have encroached...some inconveniences which would arise from glass of tlie ordinary thickness, pieces of the thin glass used for the covers of microscopic objects were carefully... | |
 | Henry Enfield Roscoe - 1873 - 552 pages
...angle of 45°. In a direction at right angles to that of the slit an opening of about ^ inch was lefI between the pieces of glass for the passage of 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... | |
 | Henry Enfield Roscoe - 1873 - 542 pages
...slit at an angle of 45°. 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...from glass of the ordinary thickness, pieces of the thiu glass used for the covers of microscopic objects were carefully selected, and these were silvered... | |
 | sir Henry Enfield Roscoe - 1873 - 550 pages
...surfaces are about 0'5 inch from the slit, and the rays from the spark are divergent, the light reilected from the pieces of glass will have encroached upon...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 - 546 pages
...the slit at an angle of 45°. 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... | |
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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... 
