1 m n*/ |Stbrarg STEAM-TURBINE PRINCIPLES AND PRACTICE TERRELL CROFT, Editor CONTRIBUTORS Thefollowinghavecontributedmanuscriptordataorhaveotherwiseassisted in the preparation of this work: Edmoxd Siroky I. Y. Le Bow E. R. Powell, Terrell Croft Engineering Company BOOKS ON PRACTICAL ELECTRICITY By Terrell Croft American Electricians' Handbook Wiring of Finished Buildings Wiring forLight and Power Electrical Machinery Practical Electric Illumination Practical Electricity Central Stations Lighting Circuits and Switches Alt:^rnating-Current Armature Winding Conduit Wiring Electrical Machinery and Control Diagrams Circuit Troubles and Testing Electrical-Machinery Erection Signal Wiring Automobile Wiring Diagrams POWER PLANT SERIES Terrell Croft Editor-in-chief Steam Boilers Steam-Power-Plant Auxiliaries Steam-engine Principles and Practice Steam-turbine Principles and Practice Machinery Foundations and Erection Practical Heat McGRAW-HILL BOOK COMPANY Inc. STEAM-TURBINE PRINCIPLES AND PRACTICE „lh^-^ \J^ ^ TERRELL-CROFT, Editor CONSULTING ENGINEER. DIRECTING EfTOINEER, TERRELL CROFT ENGINEERING CO. MEMBER OP THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS. MEMBER OF AMERICAN INSTITUTE OF ELECTRICAL ENGINEERS. MEMBER OF THE ILLUMINATING ENGINEERING SOCIETY. MEMBER AMERICAN SOCIETY TESTING MATERIALS. NORTHEASTERN U^VERSITV Ss^y Division First Edition Fourth Impression McGRAW-HILL BOOK COMPANY, Inc. NEW YORK: 370 SEVENTH AVENUE LONDON: 6 & 8 BOUVERIE ST., E. C. 4 1923 C8S Copyright, 1923,/by Terrell Croft PKINTED IN THE UNITED STATES OF AMEBICA HE MAPLE PRESS - YORK PA