Word: linearities
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...eight-inch photographic telescope for the observatory is in process of construction. It is called a doublet, or rectilinear instrument, from the fact that it is to contain two object glasses, by which the linear distortions caused by ordinary lenses are nearly eradicated. The new telescope differs from the present Draper instrument in that it will take successive stellar photographs automatically, changing and exposing the plates according to the particular programme decided upon. The charts produced will be about eight inches square...
...invitation of the mathematical department, Mr. A. Chessin will deliver a short course of lectures on "Non-linear Partial Differential Equations of the First Order." The first lecture will be given on March 20, at 3.30 p. m., in Sever...