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National advisory committee for aeronautics: Report No. 447, Static Thrust of Airplane Propellers
368
BOOK
REVIEWS.
[J. F. I.
Consumer of the Lliearing and Washing Properties of Fabrics and Garments. 1931. World Almanac and Book of Facts for 1933. WOYTACEK, CARL. Lehrbuch der Glasbhiserei. Zweite, neubearbeitete und erweiterte Auflage. 1932. YOUNG, GEORGE J. Elements of Mining. Third ediiion. 1932.
BOOK
REVIEWS.
LA THEORIE ATOMIQUEET LA DESCRIPTIONSDES PHENOMENES,Quatre articles precedes d’une introduction. Par Niels Bohr. Traduction francaise de Andree Legros et Leon Rosenfeld. V-I 13 pages, 15 X 23 ems., paper. Paris, Gauthier-Villars et Cie., 1932. Price 20 francs. Among the famous investigators who gradually have been bringing modern atomic theory into an orderly and connected form, Prof. Bohr has made contributions which are indicative of the stroke of genius which will finally achieve that end. Numerous authoritative accounts of the progress of these advances are extant, but a general survey by the author of these dominant contributions must arouse widespread interest. The subject-matter is a chronological arrangement, duly revised, of four papers on the fundamental components of atomic theory. These are presented under (I) Atomic theory and mechanics (1925) (2) The quantic postulate and the latest development of atomic theory (x927), (3) The quantum of action and the description of its phenomena (Ig2g), (4) Atomic theory and the fundamental principles of the description of its phenomena (1929). An introductory chapter (rgzg) with an addendum (1931) is included. L. E. P. ACOUSTICSANDARCHITECTURE,by Paul E. Sabine, Ph.D. Riverbank Laboratories. 327 pages, ilhrstrations, tables, 15.3 X 23.4 ems. New York, McGraw-Hill Book Company, 1932. Price $3.50. A very great deal of thought has been given to acoustics by architects and engineers, as the author points out in the preface. This subject is bound to demand much more study as buildings of new type rise to replace old structures. The properties of sound, reverberation, absorption, control, measurement and transmission all have treatment in as many chapters. The book is well prepared and freely illustrated. It will be useful to the student, engineer and designer of rooms and particularly halls where success or failure hangs upon the behavior of sound. H. W. ELKINTON. NATIONAL ADVISORYCOMMITTEEFOR AERONAUTICS: Report No. 447, Static Thrust of Airplane Propellers, by Walter S. Diehl,. 8 pages, diagrams, 23 X 2g ems. Washington, Superintendent of Documents, 1932. Price five cents. Static thrust data from more than IOO airplane propeller tests are collected
bIar., 1933.1
PUBLICATIONS
from various sources and combined thrust coefficient KT~ in the equation
369
RECEIVED.
in working charts,
from which the static
* _ KT~ X b,kp ’ - r.p.m. X diam. may be readily determined. The available data cover practically For extreme pitch ratios, or propellers and are in good agreement. and for very high blade settings, the values of KT,, are shown to siderably from the generally used linear relations based on data pitch ratios.
all types of for very low deviate,conat moderate
Report No. 451, The Drag of Two Streamline Bodies as Affected by Protuberances and Appendages, by Ira H. Abbott, 8 pages, illustrations, Price 23 X 29 ems. W’ashington, Superintendent of Documents, 1932. five cents. Two airship models were tested in the N.A.C.A. variable-density wind tunnel to determine the drag coefficients at zero pitch, and the effect of fins and cars and of flat and streamline protuberances located at various positions along the hull. During the investigation the stern of one model was rounded off to produce a The extreme range of the Reynolds Number based on the overblunter shape. all length of the models was from 1,300,000 to 33,000,000. At large values of the Reynolds Number the streamline protuberance affected the drag very little, and the additional drag caused by the flat protuberance was less than the calculated drag of the protuberance alone. The fins and cars together increased the bare-hull drag about 20 per cent. Report No. 453, The Estimation of Maximum Load Capacity of Seaplanes and Flying Boats, by Walter S. Diehl, 5 pages, diagrams, 23 X 29 ems. Washington, Superintendent of Documents, 1932. Price five cents. It is shown that the relation between the gross load Wand the time for takeoff t of seaplanes and flying boats is of the form w nl =W+K*
t
Where W, is the maximum possible load corresponding to infinite value of t, b.hp is the total brake horsepower and K is a constant. Data from four tests give K = 140. This equation supplies a method of calculating time for take-off with any load, or vice versa, when the time or one load is known.
PUBLICATIONS
RECEIVED.
Mirrors, Prisms and Lenses, A Textbook of Geometrical Optics, by James P. C.
Southall. 1933.
%X!
806 pages, ill., 13.5 X
21
ems.
New York,
Macmillan
Company,
$4.50.
Microenergetipue,
303 pages, 16.5 X
2.5
par Pierre Bricont, preface ems. Paris, Gauthier-Villars
de M. Ch. Fabry, Tome I. et Cie, 1933. Price IOO frs.
BOOK
REVIEWS.
[J. F. I.
Consumer of the Lliearing and Washing Properties of Fabrics and Garments. 1931. World Almanac and Book of Facts for 1933. WOYTACEK, CARL. Lehrbuch der Glasbhiserei. Zweite, neubearbeitete und erweiterte Auflage. 1932. YOUNG, GEORGE J. Elements of Mining. Third ediiion. 1932.
BOOK
REVIEWS.
LA THEORIE ATOMIQUEET LA DESCRIPTIONSDES PHENOMENES,Quatre articles precedes d’une introduction. Par Niels Bohr. Traduction francaise de Andree Legros et Leon Rosenfeld. V-I 13 pages, 15 X 23 ems., paper. Paris, Gauthier-Villars et Cie., 1932. Price 20 francs. Among the famous investigators who gradually have been bringing modern atomic theory into an orderly and connected form, Prof. Bohr has made contributions which are indicative of the stroke of genius which will finally achieve that end. Numerous authoritative accounts of the progress of these advances are extant, but a general survey by the author of these dominant contributions must arouse widespread interest. The subject-matter is a chronological arrangement, duly revised, of four papers on the fundamental components of atomic theory. These are presented under (I) Atomic theory and mechanics (1925) (2) The quantic postulate and the latest development of atomic theory (x927), (3) The quantum of action and the description of its phenomena (Ig2g), (4) Atomic theory and the fundamental principles of the description of its phenomena (1929). An introductory chapter (rgzg) with an addendum (1931) is included. L. E. P. ACOUSTICSANDARCHITECTURE,by Paul E. Sabine, Ph.D. Riverbank Laboratories. 327 pages, ilhrstrations, tables, 15.3 X 23.4 ems. New York, McGraw-Hill Book Company, 1932. Price $3.50. A very great deal of thought has been given to acoustics by architects and engineers, as the author points out in the preface. This subject is bound to demand much more study as buildings of new type rise to replace old structures. The properties of sound, reverberation, absorption, control, measurement and transmission all have treatment in as many chapters. The book is well prepared and freely illustrated. It will be useful to the student, engineer and designer of rooms and particularly halls where success or failure hangs upon the behavior of sound. H. W. ELKINTON. NATIONAL ADVISORYCOMMITTEEFOR AERONAUTICS: Report No. 447, Static Thrust of Airplane Propellers, by Walter S. Diehl,. 8 pages, diagrams, 23 X 2g ems. Washington, Superintendent of Documents, 1932. Price five cents. Static thrust data from more than IOO airplane propeller tests are collected
bIar., 1933.1
PUBLICATIONS
from various sources and combined thrust coefficient KT~ in the equation
369
RECEIVED.
in working charts,
from which the static
* _ KT~ X b,kp ’ - r.p.m. X diam. may be readily determined. The available data cover practically For extreme pitch ratios, or propellers and are in good agreement. and for very high blade settings, the values of KT,, are shown to siderably from the generally used linear relations based on data pitch ratios.
all types of for very low deviate,conat moderate
Report No. 451, The Drag of Two Streamline Bodies as Affected by Protuberances and Appendages, by Ira H. Abbott, 8 pages, illustrations, Price 23 X 29 ems. W’ashington, Superintendent of Documents, 1932. five cents. Two airship models were tested in the N.A.C.A. variable-density wind tunnel to determine the drag coefficients at zero pitch, and the effect of fins and cars and of flat and streamline protuberances located at various positions along the hull. During the investigation the stern of one model was rounded off to produce a The extreme range of the Reynolds Number based on the overblunter shape. all length of the models was from 1,300,000 to 33,000,000. At large values of the Reynolds Number the streamline protuberance affected the drag very little, and the additional drag caused by the flat protuberance was less than the calculated drag of the protuberance alone. The fins and cars together increased the bare-hull drag about 20 per cent. Report No. 453, The Estimation of Maximum Load Capacity of Seaplanes and Flying Boats, by Walter S. Diehl, 5 pages, diagrams, 23 X 29 ems. Washington, Superintendent of Documents, 1932. Price five cents. It is shown that the relation between the gross load Wand the time for takeoff t of seaplanes and flying boats is of the form w nl =W+K*
t
Where W, is the maximum possible load corresponding to infinite value of t, b.hp is the total brake horsepower and K is a constant. Data from four tests give K = 140. This equation supplies a method of calculating time for take-off with any load, or vice versa, when the time or one load is known.
PUBLICATIONS
RECEIVED.
Mirrors, Prisms and Lenses, A Textbook of Geometrical Optics, by James P. C.
Southall. 1933.
%X!
806 pages, ill., 13.5 X
21
ems.
New York,
Macmillan
Company,
$4.50.
Microenergetipue,
303 pages, 16.5 X
2.5
par Pierre Bricont, preface ems. Paris, Gauthier-Villars
de M. Ch. Fabry, Tome I. et Cie, 1933. Price IOO frs.