. Carnegie Institution of Washington publication. N and M, each arm terminating in a fine horizontal set-screw, s, s, below,adapted to push against the rim of the iron block. In this way adequatelystationary conditions and an elastic fine adjustment for superposed longi-tudinal spectrum axes were both secured with advantage. Similar elasticadjustments have been recently applied. It was now possible to manipulatethe micrometer at M by hand; but a glass-plate compensator C, rotated by atangent screw over a graduated arc, was also convenient. Later other typeswere attached, including an air-compe
. Carnegie Institution of Washington publication. N and M, each arm terminating in a fine horizontal set-screw, s, s, below,adapted to push against the rim of the iron block. In this way adequatelystationary conditions and an elastic fine adjustment for superposed longi-tudinal spectrum axes were both secured with advantage. Similar elasticadjustments have been recently applied. It was now possible to manipulatethe micrometer at M by hand; but a glass-plate compensator C, rotated by atangent screw over a graduated arc, was also convenient. Later other typeswere attached, including an air-compensator, in which path-difference wassecured by exhausting the air within a closed pipe provided with glass-plateends. These contrivances were eventually superfluous, however, as it wasfound that on reducing the rotation of the micrometer-screw the latter couldbe used at once. In case of homogeneous light and a wide slit, fringes were visible in an ordi-nary telescope for a play of over 2 cm. of the micrometer-screw, passing, how-ever, between ex
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Keywords: ., bookcentury1900, bookdecade1910, bookidcarnegieinst, bookyear1917
