The scientific papers of Sir William Huggins (1909)
Huggins, William, Sir, 1824-1910, Huggins, Lady, d. 1915 · London, W. Wesley and son · leaf 30
carried verysmoothly by a clock motion. As the linear spectrum of the point of light which a star forms at thefocus of the object-glass is too narrow for the observation of the dark lines,it becomes necessary to spread out the image of the star ; and to prevent lossof light, it is of importance… … io Scientific Papers not greater than will correspond to the breadth of the spectrum (when viewedin the apparatus), just sufficient to enable the eye to distinguish with ease thedark lines by which it may be crossed. No arrangement tried by us has beenfound more suitable to effect this enlargement…
Astronomy
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