Experimental Mec

Experimental Mechanics A Course of Lectures Delivered at the Royal College of Science for Ireland

Name: Experimental Mechanics A Course of Lectures Delivered at the Royal College of Science for Ireland
Author: Ball, Robert S. (Robert Stawell), 1840-1913

作者：Ball, Robert S. (Robert Stawell), 1840-1913
体例：题　章数：171
字数：427,026　来源：Project Gutenberg

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EXPERIMENTAL MECHANICS
EXPERIMENTAL MECHANICS
A COURSE OF LECTURES
SECOND EDITION
PREFACE.
ROBERT S. BALL.
TABLE OF CONTENTS.
APPENDIX I.
APPENDIX II.
INDEX 355
EXPERIMENTAL MECHANICS.
INTRODUCTION.
THE DEFINITION OF FORCE.
THE MEASUREMENT OF FORCE.
EQUILIBRIUM OF TWO FORCES.
EQUILIBRIUM OF THREE FORCES.
A SMALL FORCE SOMETIMES BALANCES TWO LARGER FORCES.
INTRODUCTION.
ONE FORCE RESOLVED INTO TWO FORCES.
EXPERIMENTAL ILLUSTRATIONS.
29. We give a second example, in illustration of the same principle.
SAILING.
ONE FORCE RESOLVED INTO THREE FORCES NOT IN THE SAME PLANE.
THE JIB AND TIE ROD.
INTRODUCTION.
PRESSURE OF A LOADED BEAM ON ITS SUPPORTS.
EQUILIBRIUM OF A BAR SUPPORTED ON A KNIFE-EDGE.
THE COMPOSITION OF PARALLEL FORCES.
PARALLEL FORCES ACTING IN OPPOSITE DIRECTIONS.
THE COUPLE.
THE WEIGHING SCALES.
INTRODUCTION.
SPECIFIC GRAVITY.
THE PLUMMET AND SPIRIT-LEVEL.
THE CENTRE OF GRAVITY.
STABLE AND UNSTABLE EQUILIBRIUM.
PROPERTY OF THE CENTRE OF GRAVITY IN A REVOLVING WHEEL.
THE NATURE OF FRICTION.
THE MODE OF EXPERIMENTING.
TABLE I.—FRICTION.
TABLE II.—FRICTION.
FRICTION IS PROPORTIONAL TO THE PRESSURE.
TABLE III.—FRICTION.
A MORE ACCURATE LAW OF FRICTION.
TABLE IV.—FRICTION.
THE COEFFICIENT VARIES WITH THE WEIGHTS USED.
TABLE V.—FRICTION.
TABLE VI.—FRICTION.
THE ANGLE OF FRICTION.
TABLE VII.—ANGLE OF STATICAL FRICTION.
TABLE VIII.—ANGLE OF FRICTION.
ANOTHER LAW OF FRICTION.
CONCLUDING REMARKS.
INTRODUCTION.
FRICTION BETWEEN A ROPE AND AN IRON BAR.
THE USE OF THE PULLEY.
LARGE AND SMALL PULLEYS.
THE LAW OF FRICTION IN THE PULLEY.
WHEELS.
ENERGY.
INTRODUCTION.
THE SINGLE MOVEABLE PULLEY.
TABLE IX.—SINGLE MOVEABLE PULLEY.
THE THREE-SHEAVE PULLEY-BLOCK.
TABLE X.—THREE-SHEAVE PULLEY-BLOCKS.
THE DIFFERENTIAL PULLEY-BLOCK.
TABLE XI.—THE DIFFERENTIAL PULLEY-BLOCK.
THE EPICYCLOIDAL PULLEY-BLOCK.
TABLE XII.—THE EPICYCLOIDAL PULLEY-BLOCK.
THE LEVER OF THE FIRST ORDER.
THE LEVER OF THE SECOND ORDER.
THE LEVER OF THE THIRD ORDER.
THE INCLINED PLANE WITHOUT FRICTION.
TABLE XIII.—INCLINED PLANE.
THE INCLINED PLANE WITH FRICTION.
0·288 × 0·955 _R_ = 0·275 _R_.
0·275 _R_ + 0·296 _R_ = 0·571 _R_.
TABLE XIV.—INCLINED PLANE.
0·9 + 0·254 _R_.
0·9 + 0·55 _R_.
TABLE XV.—INCLINED PLANE.
THE SCREW.
TABLE XVI.—THE SCREW.
THE SCREW-JACK.
TABLE XVII.—THE SCREW-JACK.
THE SCREW BOLT AND NUT.
INTRODUCTION.
EXPERIMENTS UPON THE WHEEL AND AXLE.
TABLE XVIII.—WHEEL AND AXLE.
FRICTION UPON THE AXLE.
THE WHEEL AND BARREL.
TABLE XIX.—THE WHEEL AND BARREL.
THE WHEEL AND PINION.
TABLE XX.—THE WHEEL AND PINION.
THE CRANE.
TABLE XXI.—THE CRANE.
TABLE XXII.—THE CRANE FOR HEAVY LOADS.
CONCLUSION.
INTRODUCTION
THE GENERAL PROPERTIES OF TIMBER.
RESISTANCE TO EXTENSION.
RESISTANCE TO COMPRESSION.
CONDITION OF A BEAM STRAINED BY A TRANSVERSE FORCE.
TABLE XXIII.—DEFLECTION OF A BEAM.
A BEAM FREE AT THE ENDS AND LOADED IN THE MIDDLE.
TABLE XXIV.—STRENGTH OF A BEAM.
387. Let us test the law also for the 10" bar, No. 10—
398. We can now calculate the strength of any rectangular beam of pine:
A BEAM UNIFORMLY LOADED.
EFFECT OF SECURING THE ENDS OF A BEAM UPON ITS STRENGTH.
BEAMS SECURED AT ONE END AND LOADED AT THE OTHER.
INTRODUCTION.
WEIGHT SUSTAINED BY TIE AND STRUT.
A B = 20", A C = 18", B C = 27";
A BRIDGE WITH TWO STRUTS.
A BRIDGE WITH FOUR STRUTS.
A BRIDGE WITH TWO TIES.
A SIMPLE FORM OF TRUSS.
THE WYE BRIDGE.
INTRODUCTION.
THE GIRDER.
THE TUBULAR BRIDGE.
THE SUSPENSION BRIDGE.
INTRODUCTION.
THE FIRST LAW OF MOTION.
THE EXPERIMENT OF GALILEO FROM THE TOWER OF PISA.
A BODY FALLS 16' IN THE FIRST SECOND.
THE ACTION OF GRAVITY IS INDEPENDENT OF THE MOTION OF THE BODY.
HOW THE FORCE OF GRAVITY IS DEFINED.
516. From the formula
THE PATH OF A PROJECTILE IS A PARABOLA.
INERTIA.
THE HAMMER.
THE STORING OF ENERGY.
14(6 + X) = 56 X,
THE FLY-WHEEL.
THE PUNCHING MACHINE.
THE NATURE OF CIRCULAR MOTION.
THE ACTION OF CIRCULAR MOTION UPON LIQUIDS.
THE APPLICATIONS OF CIRCULAR MOTION.
THE PERMANENT AXES.
INTRODUCTION.
THE CIRCULAR PENDULUM.
LAW CONNECTING THE TIME OF VIBRATION WITH THE LENGTH.
THE FORCE OF GRAVITY DETERMINED BY THE PENDULUM.
THE CYCLOID.
THE COMPOUND PENDULUM.
THE CENTRE OF OSCILLATION.
THE CENTRE OF PERCUSSION.
THE CONICAL PENDULUM.
THE COMPOSITION OF VIBRATIONS.
INTRODUCTION.
THE COMPENSATING PENDULUM.
THE ESCAPEMENT.
THE TRAIN OF WHEELS.
THE HANDS.
THE STRIKING PARTS.
APPENDIX I.
TABLE III.
TABLE IV.
This is practically the same formula as
TABLE III.
Σ _R₁_² = _N_² (1² + 2² + &c. + _m_²)
TABLE IV.
No values exist for _x_ and _y_, so that the equation
Solving these, we find
APPENDIX II.
INDEX.
THE END.
RICHARD CLAY AND SONS, LIMITED, LONDON AND BUNGAY.
End of Project Gutenberg's Experimental Mechanics, by Robert Stawell Ball