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Belt conveyers and belt elevators
THE FRANKLIN LIBRARY RECENT
INSTITUTE. NOTES.
ADDITIONS.
DAWXDOWSKY,F.--Die Leim- und Gelatine-Fabrikation. Third revised edition. 1893. ETTELE, CLAoDE.--Lubricating Oil Salesman's Primer. I926. FE~RXER, R.--Les Nouveaux Axiomes de l'~lectronique, x925. GIBBS, W. E.--The Dust Hazard in Industry. I925. HAAs, ARTnUR.--Introduction to Theoretical Physics. Two volumes. 19251926. HmscH, MmER.--Sammlung yon Beispielen, Formeln und Aufgaben aus der Buchstabenrechnung und Algebra. I816. KOLLER, THrODOR.--Praktische Herstellung yon LSsungen. 1888. KRIES, FaizoRlCH.--Lehrbuch der reinen Mathematik. I822. MACH, ERNST.--The Principles of Physical Optics. I925. MEADE, RlcraAaD K.--Portland Cement: Its Composition, Raw Materials, Marmfacture, Testing and Analysis. Third edition. 1926. MINGLE, J. G.--Draft and Capacity of Chimneys. 1925. National Electric Light Association.--Relay Handbook. I926. NOYES, W. A.--Organie Chemistry for the Laboratory. Fifth edition, revised. I926. PaRsoNs, WM. BARCLAY.--Robert Fulton and the Submarine. 1922. ROGERS, ALAN, Editor.--Elements of Industrial Chemistry. Second edition. 1926.
BOOK REVIEWS. BELT CONVEYERSAND BELT ELEVATORS. By Frederic V. Hetzel, M.E., Member of the American Society of Mechanical Engineers, Member of The Franklin Institute of Pennsylvania. Second edition, revised, xi-333 pages, 9 x 6 inches, cloth. New York, John Wiley and Sons, Inc., I926. Price, $5 net. The first edition of this treatise was surveyed in these pages shortly aher its appearance in 1922. A few additions, only, have been found desirable. Notable among these are improvements in the design of belt-conveyor idlers with anti-friction bearings, a most important detail upon which, the author states, much of the future progress of belt conveying will depend. Several new forms of elevator buckets which have been adopted within the last three years are also described and their probable influence on high belt speeds for grain elevators are pointed out. The work is of particular interest to engineers who must have quantitative information and an analytic rationale of the subject. These the reader will find in ample measure clarified by the generous number of -°88 well-executed line-cuts and half-tones distributed throughout the text. About two-thirds of 25I
252
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REV1E\VS.
[J. F. I.
the book is occupied by the first section, Belt Conveyors, by which material is transported in contact with a belt which is operated in general at no great declivity. The remainder deals with Belt Elevators in which the gradient of the belt, to which buckets are attached, more nearly approaches or attains the vertical. Chapter I contains a general description of the component parts of belt conveyors. With this is an illuminating set of ten annotated diagrammatic cuts of typical belt-drives and arrangement of loading chutes and trippers. A brief but satisfactory account of early history and development are given in Chapter II. T h e manufacture of rubber belts, their structure and a multiplicity of other items in the technique of this basic component of the conveyor are considered at length in Chapter III. Supporting and guiding the belt, idlers and troughing the belt come next in Chapter IV. Chapter V, on driving the belt, gives the method of determining the horse-power required, and other related calculations with an example fully worked out. Tension and take-up devices, loading the belt, discharging from the belt, protecting and cleaning the belt are given adequate analysis in the next four chapters. The remaining chapters of Section I are respectively devoted to package conveyors, special uses for belt conveyors, life of belts and when to use belt conveyors. These are mere chapter headings, each of which includes a large number of separate topics of vital interest to the designer who would have a long search to find elsewhere the design data and analysis collected here. In this connection it may be mentioned, there are fifty-eight tables of design data, such as weights of specified kinds of conveyor belting, spacing of idlers, spacing of buckets, work of pick-up in elevator boots, etc. The last ten chapters which constitute section II relate to belt elevators. The chapter headings are: General descriptions, centrifugal discharge elevators, elevator buckets, continuous bucket elevators, belts for elevators, fastening buckets to belts, driving belt elevators, elevator boots, inclined elevators and elevator casings. The matter of this section is treated in the same thorough detail as is accorded the first section. There is no formal bibliography but many references to original sources of information are cited in the text. The author, whose qualifications are exceptional, has produced an authoritative and analytical work which will well earn the hearty appreciation of all those who are engaged in the rational design of belt conveyors and belt elevators. It is to be hoped that he will write a companion treatise on chain conveyors; the present work bespeaks for it a warm welcome. The quality of press-work is of high order. LUCIEN E. PICOLET. PORTLAND CEMENT. By Richard K. Meade, M.S. xii-7o6 pages, 206 illustrations, 8vo. Easton, Penna., The Chemical Publishing Company, I926. Price, $IO. The initiative of this work, the author tells us, was a small volume issued in 19o2 on the " Chemical and physical Examination of Portland Cement." This was succeeded by a larger volume with the present title and now there is published the much increased third edition. Originally in.tended for chemists and cement engiueers the work described tests and analyses only. The section
INSTITUTE. NOTES.
ADDITIONS.
DAWXDOWSKY,F.--Die Leim- und Gelatine-Fabrikation. Third revised edition. 1893. ETTELE, CLAoDE.--Lubricating Oil Salesman's Primer. I926. FE~RXER, R.--Les Nouveaux Axiomes de l'~lectronique, x925. GIBBS, W. E.--The Dust Hazard in Industry. I925. HAAs, ARTnUR.--Introduction to Theoretical Physics. Two volumes. 19251926. HmscH, MmER.--Sammlung yon Beispielen, Formeln und Aufgaben aus der Buchstabenrechnung und Algebra. I816. KOLLER, THrODOR.--Praktische Herstellung yon LSsungen. 1888. KRIES, FaizoRlCH.--Lehrbuch der reinen Mathematik. I822. MACH, ERNST.--The Principles of Physical Optics. I925. MEADE, RlcraAaD K.--Portland Cement: Its Composition, Raw Materials, Marmfacture, Testing and Analysis. Third edition. 1926. MINGLE, J. G.--Draft and Capacity of Chimneys. 1925. National Electric Light Association.--Relay Handbook. I926. NOYES, W. A.--Organie Chemistry for the Laboratory. Fifth edition, revised. I926. PaRsoNs, WM. BARCLAY.--Robert Fulton and the Submarine. 1922. ROGERS, ALAN, Editor.--Elements of Industrial Chemistry. Second edition. 1926.
BOOK REVIEWS. BELT CONVEYERSAND BELT ELEVATORS. By Frederic V. Hetzel, M.E., Member of the American Society of Mechanical Engineers, Member of The Franklin Institute of Pennsylvania. Second edition, revised, xi-333 pages, 9 x 6 inches, cloth. New York, John Wiley and Sons, Inc., I926. Price, $5 net. The first edition of this treatise was surveyed in these pages shortly aher its appearance in 1922. A few additions, only, have been found desirable. Notable among these are improvements in the design of belt-conveyor idlers with anti-friction bearings, a most important detail upon which, the author states, much of the future progress of belt conveying will depend. Several new forms of elevator buckets which have been adopted within the last three years are also described and their probable influence on high belt speeds for grain elevators are pointed out. The work is of particular interest to engineers who must have quantitative information and an analytic rationale of the subject. These the reader will find in ample measure clarified by the generous number of -°88 well-executed line-cuts and half-tones distributed throughout the text. About two-thirds of 25I
252
Boo](
REV1E\VS.
[J. F. I.
the book is occupied by the first section, Belt Conveyors, by which material is transported in contact with a belt which is operated in general at no great declivity. The remainder deals with Belt Elevators in which the gradient of the belt, to which buckets are attached, more nearly approaches or attains the vertical. Chapter I contains a general description of the component parts of belt conveyors. With this is an illuminating set of ten annotated diagrammatic cuts of typical belt-drives and arrangement of loading chutes and trippers. A brief but satisfactory account of early history and development are given in Chapter II. T h e manufacture of rubber belts, their structure and a multiplicity of other items in the technique of this basic component of the conveyor are considered at length in Chapter III. Supporting and guiding the belt, idlers and troughing the belt come next in Chapter IV. Chapter V, on driving the belt, gives the method of determining the horse-power required, and other related calculations with an example fully worked out. Tension and take-up devices, loading the belt, discharging from the belt, protecting and cleaning the belt are given adequate analysis in the next four chapters. The remaining chapters of Section I are respectively devoted to package conveyors, special uses for belt conveyors, life of belts and when to use belt conveyors. These are mere chapter headings, each of which includes a large number of separate topics of vital interest to the designer who would have a long search to find elsewhere the design data and analysis collected here. In this connection it may be mentioned, there are fifty-eight tables of design data, such as weights of specified kinds of conveyor belting, spacing of idlers, spacing of buckets, work of pick-up in elevator boots, etc. The last ten chapters which constitute section II relate to belt elevators. The chapter headings are: General descriptions, centrifugal discharge elevators, elevator buckets, continuous bucket elevators, belts for elevators, fastening buckets to belts, driving belt elevators, elevator boots, inclined elevators and elevator casings. The matter of this section is treated in the same thorough detail as is accorded the first section. There is no formal bibliography but many references to original sources of information are cited in the text. The author, whose qualifications are exceptional, has produced an authoritative and analytical work which will well earn the hearty appreciation of all those who are engaged in the rational design of belt conveyors and belt elevators. It is to be hoped that he will write a companion treatise on chain conveyors; the present work bespeaks for it a warm welcome. The quality of press-work is of high order. LUCIEN E. PICOLET. PORTLAND CEMENT. By Richard K. Meade, M.S. xii-7o6 pages, 206 illustrations, 8vo. Easton, Penna., The Chemical Publishing Company, I926. Price, $IO. The initiative of this work, the author tells us, was a small volume issued in 19o2 on the " Chemical and physical Examination of Portland Cement." This was succeeded by a larger volume with the present title and now there is published the much increased third edition. Originally in.tended for chemists and cement engiueers the work described tests and analyses only. The section