Dimensional Changes Caused in Glass by Heating Cycles (Classic Reprint)

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Excerpt from Dimensional Changes Caused in Glass by Heating CyclesThe shifts of the fringe system of the bottom plate and of that of the air wedge determined by the lengths of the test specimens between the two plates were determined by means of the usual equipment which is described in the articles cited. With the exception of a few cases where the test specimens were so tall that the air fringes moved very rapidly past the reference point on the top plate and in such numbers that to have recorded all of them would have been too laborious, the time of practically every such passing of a whole fringe was recorded. As each air fringe count was recorded, the number and fractional part of the refraction thermometer fringes which passed the reference point up to that time was also recorded. When the test specimens were relatively small or the temperature was being held stationary it was occasionally considered advisable to increase the number of observations on the air fringes beyond that of the whole bands. The labor required in recording the increased number of observations is compensated for by the advantage gained when it is found necessary to correct any count which proves to have been erroneous because of the accidental omission of a Whole band and also by the greater certainty regarding the trend of the curves in graphical representations of the data. Furthermore, any ih stability ou the part of the interferometer system is also more readily detected by using a larger number of points.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully, any imperfections that remain are intentionally left to preserve the state of such historical works.