Jones, H. Spencer (Harold Spencer), 1890- · London E. Arnold & co. · leaf 337
Fig. 88.—The Meridiaox Photometer. THE STARS 293 to one another. A diaphragm is so placed as to cut off theextraordinary beam from the one objective and the ordinarybeam from the other, allowing the other two beams which arepolarized at right angles to unite and to pass through theeyepiece, L. The…
Astronomy
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