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Dynamometers And The Measurement Of Power - A Treatise On The Construction And Application Of Dynamometers

  • Kartonierter Einband
  • 224 Seiten
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Many of the earliest books! particularly those dating back to the 1900s and before! are now extremely scarce and increasingly exp... Weiterlesen
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Klappentext Many of the earliest books! particularly those dating back to the 1900s and before! are now extremely scarce and increasingly expensive. We are republishing these classic works in affordable! high quality! modern editions! using the original text and artwork.

Klappentext

PREFACE. THE aim in the following pages has been to present in convenient form, for the use of Technical Students and Engineers, a description of the construction and principles of action of the various types of Dynamom- eter employed in the measurement of power. A chronological presentation of the subject has not been attempted, as many of the forms once used have with very few exceptions the entirely disappeared various types discussed are those now in use. In the measurement of the mechanical horse-power of a hydraulic motor the effective power may be as- 4 certained by means of a friction-brake, or other dyna- but as these v mometer, under any given conditions Ymay be such that the maximum power of the wheel is 1 not developed, it remains for the Engineer to determine those conditions best suited to the wheel under con- sideration. In Chapter VI is given a discussion of the methods and apparatus in use for ascertaining the effi- ciency of a given wheel, including the determination of flow in rivers and streams. The work here presented has been used as the basis of a course of lectures to Engineering students, and is the outgrowth of a series of articles published in the American Machinist. In its preparation free use has been made of numer, ous publications relating to the subject, and references for further information are given in foot-notes through- out the text. Special mention is due ProfessorAndrew Jamieson, of Glasgow, for use of matter and figures from his Steam and Steam-engines London Chas. Griffin Co.. The writer is also under obligations to Professors Jas. E. Denton, J. Burkitt Webb, Dr. Mansfield Merriman, and others. LAFAYETTE, IND., August i, 1892. J. J. FLATHER.CONTENTS. CHAPTER I. PAGE tjfTERMINATION OF DRIVING POWER I Horse-power from number of men employed Friction of shafting in mills and machine-shops Horse-power from width of belt. CHAPTER II. FRICTION-BRAKES 19 Prony brakes Proportions of small brakes Regulators- Water-cooled brakes Determination of brake-power Belt brakes Compensating brakes Rope brakes Rappards band-brake Brake for vertical shafts Materials for brake- blocks Lubrication Width and velocity of rubbing surface. CHAPTER III. ABSORPTION-DYNAMOMETERS 54 Richards dynamometer Alden dynamometer Alden brake used to test locomotive Froude water-brake. CHAPTER IV. TRANSMISSION-DYNAMOMETERS 72 Morin dynamometer Webber balance-dynamometer Briggs belt dynamometer Tatham dynamometers Other belt dynamometers Brackett cradle-dynamometer Webb floating dynamometer Hartig dynamometer Emerson power-scale Van Winkle power-meter Flather hydraulic dynamometer Indicator-cards from dynamometer. VI CONTENTS. CHAPTER V. PAGE POWER REQUIRED TO DRIVE LATHES 151 Friction in lathes Table of horse-power for small lathes Formula for horse-power running light Weight of metal removed per hour per horse-power General deductions. CHAPTER VI. MEASUREMENT OF WATER-POWER Efficiency 165 of motors Determination of weight of water Tank-measurement Current-meters Float-measurements Mid-depth velocity Water-meters Weir-measurements Coefficient of discharge Hook-gauges Flow of water in pipes Loss of head Pressure-head. DYNAMOMETERS AND THE MEASUREMENT OF POWER. CHAPTER I. DETERMINATION OF DRIVING POWER...

Produktinformationen

Titel: Dynamometers And The Measurement Of Power - A Treatise On The Construction And Application Of Dynamometers
Autor:
EAN: 9781406784619
ISBN: 1406784613
Format: Kartonierter Einband
Anzahl Seiten: 224
Gewicht: 305g
Größe: H216mm x B140mm x T13mm
Jahr: 2007