. Carnegie Institution of Washington publication. 86 THE INTERFEROMETRY OF passing into the hyperbolic patterns. However, a pair of plates of about the same thickness ( cm.), but respectively of crown and flint glass, when in- serted in the M and N beams, gave good hyperbolas.* It was interesting to notice that in the principal focus the n n fringe pattern was nearly circular or a roundish elliptic, but the ellipses were not «. strong. On drawing the ocular out, these ellipses underwent continuous deforma- tion, passing through horizontal bands finally into sharp and strong hyperbolic forms
. Carnegie Institution of Washington publication. 86 THE INTERFEROMETRY OF passing into the hyperbolic patterns. However, a pair of plates of about the same thickness ( cm.), but respectively of crown and flint glass, when in- serted in the M and N beams, gave good hyperbolas.* It was interesting to notice that in the principal focus the n n fringe pattern was nearly circular or a roundish elliptic, but the ellipses were not «. strong. On drawing the ocular out, these ellipses underwent continuous deforma- tion, passing through horizontal bands finally into sharp and strong hyperbolic forms. The fringes obtained with the differently dispersing plates must therefore be referred to space loci in which, on passing along the axis, an elliptic cone becomes linear at the apex and symmetrically hyperbolic beyond. Thus in figure 56 the sections of the cone at a, b, c show fringes of the form d, e, f. 43. Observations. Thick steel tube. — The seamless steel tube in my pos-session had the following dimensions: Length between mirrors, 160
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