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Excerpt from Naca Mach Number Warning Device for Use in Flight A diagram of the instrument is shown in figure 1. The inner bellows is evacuated and responds to total pressure H. The case is subjected to static pressure p and the outer bellows is therefore actuated by impact pressure H p. The effective areas of the bellows are so proportioned that, at the operating point of the device, the force exerted by the outer bellows is equal and oppo site to the force exerted by the inner bellows. Further increase of H p causes the outer bellows to lift the inner bellows off its stop and thus close the contact. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This 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.