. Carnegie Institution of Washington publication. ingle-lens objective (10 cm. or more), the Nernst filament may be useddirectly in place of the slit. If the beam passing the objective is not widerthan i cm. (opaque slotted screen), very perfect ellipses may be inserting the trough with a thickness of cm. of CS2 solution normallyinto the MH beam, the original very large ellipses were reduced in size androunded as usual to smaller circles. Submerging a convex lens (i diopter)into the liquid until the beam passed symmetrically through it changedthese circles to very long horizont
. Carnegie Institution of Washington publication. ingle-lens objective (10 cm. or more), the Nernst filament may be useddirectly in place of the slit. If the beam passing the objective is not widerthan i cm. (opaque slotted screen), very perfect ellipses may be inserting the trough with a thickness of cm. of CS2 solution normallyinto the MH beam, the original very large ellipses were reduced in size androunded as usual to smaller circles. Submerging a convex lens (i diopter)into the liquid until the beam passed symmetrically through it changedthese circles to very long horizontal spindles. A concave lens similarly pro-duced horizontally very eccentric hyperbolae. With water in the trough, onlythe convex lens showed observable fringes, these being very long, practicallylinear horizontal spindles. All these fringes lie considerably in front of theprincipal focal plane of the telescope (fig. 54, T), and the abnormal forms arenecessarily relatively faint. They change in shape and intensity with thefocal plane observed. 63.
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