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Excerpt from 1907 Air Brake Catechism, and Instruction Book on the Construction and Operation of the Westinghouse and New York Air Brakes: With a List of Examination Questions and Answers for Enginemen and Trainmen The air cylinders are known as the low pres sure and high pressure cylinders, and in each type of pump, the difference in the areas of the air cylinders is in the same proportion, the low pressure piston having twice the area of the high, and the high pressure the same area as the steam cylinders. Thus three measures of air are compressed with two measures of steam. 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.

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