THE BOILERMAKER'S ASSISTANT IN DRAWING, TEMPLATING, AND CALCULATING WITH RULES FOR THE EVAPORATIVE POWER AND THE HORSE REVISED AND EDITED BY D. KINNEAR CLARK, C.E. AUTHOR OF "RAILWAY MACHINERY," ETC. WITH MORE THAN A HUNDRED ILLUSTRATIONS. Capio Yumen LONDON CROSBY LOCKWOOD AND CO. 7, STATIONERS' HALL COURT, LUDGATE HILL 1880 PREFACE. BEING myself a working boilermaker I may be credited with a knowledge of the needs of boilermakers with respect to operations of drawing, templating, and calculating. Foremen boilermakers are not supposed to impart instruction in these operations to any but those apprentices under them in whom they may take an interest. At the same time, the educated foreman has a right to expect the journeyman to have sufficient knowledge of his work. I have experienced the want of a book such as I flatter myself is formed by these collected notes. They contain many things equally simple and necessary to a boilermaker, and which every boilermaker should know, in order that he may go about his work in a systematic and business-like manner, and not by guesswork and makeshift. I could not find any one book (within the reach of my wages to purchase) sufficiently comprehensive and practical to be at once useful to the apprentice as well as to the journeyman, and devoted simply to the craft of the boilermaker, without the use of those mathematical terms which usually perplex and turn away from the study of such works many who would otherwise learn. I have therefore, herein, arranged for publication what was once a private note-book of rules for my own use. I know that the generality of men cannot answer all questions, even in relation to their own trade, just on the spur of the moment. Hence the necessity of a compact work of this sort, which the boilermaker can carry in his pocket, and in which he can find directions and tables for all the templating and calculation required in the course of his work. In conclusion, I have to express my grateful acknowledgments to Mr. D. Kinnear Clark, whose reputation and writings are known to the whole engineering world, for his kindness in revising my manuscript and suggesting improvements thereto. JOHN COURTNEY. NOTE BY THE EDITOR. I have had pleasure in revising and editing Mr. Courtney's notes, here following. They bear the impress of good practice and experience; and, simple and unpretending as they are, they will come home to the understandings of thoughtful workmen. The problems, which have been selected with judgment, and the rules, which are expressed with simplicity, will be directly useful to the practical boilermaker, and will supply just what he requires for calculating his quantities, constructing his diagrams, and shaping his templates. At the same time, he will be enabled, when called upon to do so, to proportion the rivet-joints and also to settle the dimensions of boilers, according to the pressure at which they are to work, and the power that is to be required of them. D. K. CLARK. CONTENTS CHAPTER I.- DEFINITIONS AND USEFUL NUMBERS.- Arithmetical Signs used in this Book.-Square Measure and Cubic Measure.-Definitions of the Terms which are employed in the following Rules.- Useful Numbers in Calculation. - Decimals CHAPTER II.-MENSURATION.-Circles, Rings, Ellipses, CHAPTER III.-PRACTICAL GEOMETRY AS REQUIRED BY BOILERMAKERS.-Straight Lines, Circles, and Ellipses CHAPTER IV. TANKS AND CISTERNS. Rectangular Tanks.-Segmental Tanks.-Triangular Tanks.— CHAPTER VI.-TEMPLATING.-Elbows or Knees.-Bends. -Junction of Cylinders.-Raked Funnels.-Steam Domes.-Elliptical Connections of Boilers.-Sloped CHAPTER VII.-POWER AND PROPORTIONS OF STEAM BOILERS.-Cornish and Lancashire Boilers.-Loco- motive Boilers.-Tubular Boilers or Marine Boilers. |