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Title: Pioneers of Science

Author: Sir Oliver Lodge

Release date: April 26, 2009 [eBook #28613]

Language: English

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PIONEERS OF SCIENCE



NEWTON
NEWTON
From the picture by Kneller, 1689, now at Cambridge

PIONEERS OF SCIENCE


BY
OLIVER LODGE, F.R.S.
PROFESSOR OF PHYSICS IN VICTORIA UNIVERSITY COLLEGE, LIVERPOOL




WITH PORTRAITS AND OTHER ILLUSTRATIONS



London

MACMILLAN AND CO.
AND NEW YORK
1893






Richard Clay and Sons, Limited,
LONDON AND BUNGAY.




PREFACE

This book takes its origin in a course of lectures on the history and progress of Astronomy arranged for me in the year 1887 by three of my colleagues (A.C.B., J.M., G.H.R.), one of whom gave the course its name.

The lectures having been found interesting, it was natural to write them out in full and publish.

If I may claim for them any merit, I should say it consists in their simple statement and explanation of scientific facts and laws. The biographical details are compiled from all readily available sources, there is no novelty or originality about them; though it is hoped that there may be some vividness. I have simply tried to present a living figure of each Pioneer in turn, and to trace his influence on the progress of thought.

I am indebted to many biographers and writers, among others to Mr. E.J.C. Morton, whose excellent set of lives published by the S.P.C.K. saved me much trouble in the early part of the course.

As we approach recent times the subject grows more complex, and the men more nearly contemporaries; hence the biographical aspect diminishes and the scientific treatment becomes fuller, but in no case has it been allowed to become technical and generally unreadable.

To the friends (C.C.C., F.W.H.M., E.F.R.) who with great kindness have revised the proofs, and have indicated places where the facts could be made more readily intelligible by a clearer statement, I express my genuine gratitude.

University College, Liverpool,
November, 1892.


CONTENTS

PART I
LECTURE I
PAGE
COPERNICUS AND THE MOTION OF THE EARTH 2
LECTURE II
TYCHO BRAHÉ AND THE EARLIEST OBSERVATORY 32
LECTURE III
KEPLER AND THE LAWS OF PLANETARY MOTION 56
LECTURE IV
GALILEO AND THE INVENTION OF THE TELESCOPE 80
LECTURE V
GALILEO AND THE INQUISITION 108
LECTURE VI
DESCARTES AND HIS THEORY OF VORTICES 136
LECTURE VII
SIR ISAAC NEWTON 159
LECTURE VIII
NEWTON AND THE LAW OF GRAVITATION 180
LECTURE IX
NEWTON'S "PRINCIPIA" 203

PART II
LECTURE X
ROEMER AND BRADLEY AND THE VELOCITY OF LIGHT 232
LECTURE XI
LAGRANGE AND LAPLACE—THE STABILITY OF THE SOLAR SYSTEM, AND THE NEBULAR HYPOTHESIS 254
LECTURE XII
HERSCHEL AND THE MOTION OF THE FIXED STARS 273
LECTURE XIII
THE DISCOVERY OF THE ASTEROIDS 294
LECTURE XIV
BESSEL—THE DISTANCES OF THE STARS, AND THE DISCOVERY OF STELLAR PLANETS 304
LECTURE XV
THE DISCOVERY OF NEPTUNE 317
LECTURE XVI
COMETS AND METEORS 331
LECTURE XVII
THE TIDES 353
LECTURE XVIII
THE TIDES, AND PLANETARY EVOLUTION 379

ILLUSTRATIONS

FIG.       PAGE
1.   Archimedes   8
2.   Leonardo da Vinci   10
3.   Copernicus   12
4.   Homeric Cosmogony   15
5.   Egyptian Symbol of the Universe   16
6.   Hindoo Earth   17
7.   Order of ancient Planets corresponding to the Days of the Week  19
8.   Ptolemaic System   20
9.   Specimens of Apparent Paths of Venus and of Mars among the stars   21
10.   Apparent Epicyclic Orbits of Jupiter and Saturn   22
11.   Egyptian System   24
12.   True Orbits of Earth and Jupiter   25
13.   Orbits of Mercury and Earth   25
14.   Copernican System as frequently represented   26
15.   Slow Movement of the North Pole in a Circle among the Stars   29
16.   Tychonic system, showing the Sun with all the Planets revolving round the Earth   38
17.   Portrait of Tycho   41
18.   Early out-door Quadrant of Tycho   43
19.   Map of Denmark, showing the Island of Huen   45
20.   Uraniburg   46
21.   Astrolabe   47
22.   Tycho's large Sextant   48
23.   The Quadrant in Uraniburg   49
24.   Tycho's Form of Transit Circle   50
25.   A Modern Transit Circle   51
26.   Orbits of some of the Planets drawn to scale   60
27.   Many-sided Polygon or Approximate Circle enveloped by Straight Lines   61
28.   Kepler's Idea of the Regular Solids   62
29.   Diagram of Equant   67
30.   Excentric Circle supposed to be divided into equal Areas   68
31.   Mode of drawing an Ellipse   70
32.   Kepler's Diagram proving Equable Description of Areas for an Ellipse   71
33.   Diagram of a Planet's Velocity in Different Parts of its Orbit   72
34.   Portrait of Kepler   76
35.   Curve described by a Projectile   82
36.   Two Forms of Pulsilogy   87
37.   Tower of Pisa   91
38.   View of the Half-Moon in small Telescope   97
39.   Portion of the Lunar Surface more highly magnified   98
40.   Another Portion of the Lunar Surface   99
41.   Lunar Landscape showing Earth   100
42.   Galileo's Method of estimating the Height of Lunar Mountain   101
43.   Some Clusters and Nebulæ   102
44.   Stages of the Discovery of Jupiter's Satellites   103
45.   Eclipses of Jupiter's Satellites   105
46.   Old Drawings of Saturn by Different Observers, with the imperfect Instruments of that day   111
47.   Phases of Venus   112
48.   Sunspots as seen with Low Power   113
49.   A Portion of the Sun's Disk as seen in a powerful modern Telescope   114
50.   Saturn and his Rings   115
51.   Map of Italy   118
52.   Portrait of Galileo   126
53.   Portrait of Descartes   148
54.   Descartes's Eye Diagram   151
55.   Descartes's Diagram of Vortices from his "Principia"   152
56.   Manor-house of Woolsthorpe   162
57.   Projectile Diagram   170
58. }   { 171
59. Diagrams illustrative of those near the Beginning of Newton's "Principia" 174
60.   175
61-2.   175
63.   Prismatic Dispersion   182
64.   A single Constituent of White Light is capable of no more Dispersion   183
65.   Parallel Beam passing through a Lens   184
66.   Newton's Telescope   186
67.   The Sextant, as now made   187
68.   Newton when young   196
69.   Sir Isaac Newton   200
70.   Another "Principia" Diagram   207
71.   Well-known Model exhibiting the Oblate Spheroidal Form as a Consequence of spinning about a Central Axis   219
72.   Jupiter   221
73.   Diagram of Eye looking at a Light reflected in a Distant Mirror through the Teeth of a revolving Wheel   238
74.   Fizeau's Wheel, showing the appearance of distant Image seen through its Teeth   239
75.   Eclipses of one of Jupiter's Satellites   241
76.   A Transit instrument for the British Astronomical Expedition, 1874   243
77.   Diagram of equatorially mounted Telescope   245
78.   Aberration Diagram  250
79.   Showing the three Conjunction Places in the Orbits of Jupiter and Saturn   259
80.   Lord Rosse's Drawing of the Spiral Nebula in Canes Venatici   269
81.   Saturn   271
82.   Principle of Newtonian Reflector   278
83.   Herschel's 40-foot telescope   283
84.   William Herschel   285
85.   Caroline Herschel   287
86.   Double Stars   288
87.   Old Drawing of the Cluster in Hercules   290
88.   Old Drawing of the Andromeda Nebula   291
89.   The Great Nebula in Orion   292
90.   Planetary Orbits to scale   297
91.   Diagram illustrating Parallax   307
92.   The Königsberg Heliometer   312
93.   Perturbations of Uranus   320
94.   Uranus' and Neptune's Relative Positions   325
95.   Meteorite   333
96.   Meteor Stream crossing Field of Telescope   334
97.   Diagram of Direction of Earth's Orbital Motion   335
98.   Parabolic and Elliptic Orbits   340
99.   Orbit of Halley's Comet   341
100.   Various Appearances of Halley's Comet when last seen   342
101.   Head of Donati's Comet of 1858   343
102.   Comet   344
103.   Encke's Comet   345
104.   Biela's Comet as last seen in two Portions   346
105.   Radiant Point Perspective   348
106.   Present Orbit of November Meteors   349
107.   Orbit of November Meteors before and after Encounter with Uranus   351
108.   The Mersey   355
109.   Co-tidal Lines, showing the way the Tidal Wave reaches the British Isles from the Atlantic   359
110.   Whirling Earth Model   364
111.   Earth and Moon Model   365
112.   Earth and Moon (Earth's Rotation Neglected)   366
113.   Maps showing how comparatively Free from Land Obstruction the Ocean in the Southern Hemisphere Is   369
114.   Spring and Neap Tides   370
115.   Tidal Clock   371
116.   Sir William Thomson (Lord Kelvin)   373
117.   Tide-gauge for recording Local Tides   375
118.   Harmonic Analyzer   375
119.   Tide-predicter   376
120.   Weekly Sheet of Curves   377

PIONEERS OF SCIENCE


PART I

FROM DUSK TO DAYLIGHT


DATES AND SUMMARY OF FACTS FOR LECTURE I

Physical Science of the Ancients. Thales 640 B.C., Anaximander 610 B.C., Pythagoras 600 B.C., Anaxagoras 500 B.C., Eudoxus 400 B.C., Aristotle 384 B.C., Aristarchus 300 B.C., Archimedes 287 B.C., Eratosthenes 276 B.C., Hipparchus 160 B.C., Ptolemy 100 A.D.

Science of the Middle Ages. Cultivated only among the Arabs; largely in the forms of astrology, alchemy, and algebra.

Return of Science to Europe. Roger Bacon 1240, Leonardo da Vinci 1480, (Printing 1455), Columbus 1492, Copernicus 1543.

A sketch of Copernik's life and work. Born 1473 at Thorn in Poland. Studied mathematics at Bologna. Became an ecclesiastic. Lived at Frauenburg near mouth of Vistula. Substituted for the apparent motion of the heavens the real motion of the earth. Published tables of planetary motions. Motion still supposed to be in epicycles. Worked out his ideas for 36 years, and finally dedicated his work to the Pope. Died just as his book was printed, aged 72, a century before the birth of Newton. A colossal statue by Thorwaldsen erected at Warsaw in 1830.


PIONEERS OF SCIENCE


LECTURE I

COPERNICUS AND THE MOTION OF THE EARTH

The ordinary run of men live among phenomena of which they know nothing and care less. They see bodies fall to the earth, they hear sounds, they kindle fires, they see the heavens roll above them, but of the causes and inner working of the whole they are ignorant, and with their ignorance they are content.

"Understand the structure of a soap-bubble?" said a cultivated literary man whom I know; "I wouldn't cross the street to know it!"

And if this is a prevalent attitude now, what must have been the attitude in ancient times, when mankind was emerging from savagery, and when history seems composed of harassments by wars abroad and revolutions at home? In the most violently disturbed times indeed, those with which ordinary history is mainly occupied, science is quite impossible. It needs as its condition, in order to flourish, a fairly quiet, untroubled state, or else a cloister or university removed from the din and bustle of the political and commercial world. In such places it has taken its rise, and in such peaceful places and quiet times true science will continue to be cultivated.

The great bulk of mankind must always remain, I suppose, more or less careless of scientific research and scientific result, except in so far as it affects their modes of locomotion, their health and pleasure, or their purse.

But among a people hurried and busy and preoccupied, some in the pursuit of riches, some in the pursuit of pleasure, and some, the majority, in the struggle for existence, there arise in every generation, here and there, one or two great souls—men who seem of another age and country, who look upon the bustle and feverish activity and are not infected by it, who watch others achieving prizes of riches and pleasure and are not disturbed, who look on the world and the universe they are born in with quite other eyes. To them it appears not as a bazaar to buy and to sell in; not as a ladder to scramble up (or down) helter-skelter without knowing whither or why; but as a fact—a great and mysterious fact—to be pondered over, studied, and perchance in some small measure understood. By the multitude these men were sneered at as eccentric or feared as supernatural. Their calm, clear, contemplative attitude seemed either insane or diabolic; and accordingly they have been pitied as enthusiasts or killed as blasphemers. One of these great souls may have been a prophet or preacher, and have called to his generation to bethink them of why and what they were, to struggle less and meditate more, to search for things of true value and not for dross. Another has been a poet or musician, and has uttered in words or in song thoughts dimly possible to many men, but by them unutterable and left inarticulate. Another has been influenced still more directly by the universe around him, has felt at times overpowered by the mystery and solemnity of it all, and has been impelled by a force stronger than himself to study it, patiently, slowly, diligently; content if he could gather a few crumbs of the great harvest of knowledge, happy if he could grasp some great generalization or wide-embracing law, and so in some small measure enter into the mind and thought of the Designer of all this wondrous frame of things.

These last have been the men of science, the great and heaven-born men of science; and they are few. In our own day, amid the throng of inventions, there are a multitude of small men using the name of science but working for their own ends, jostling and scrambling just as they would jostle and scramble in any other trade or profession. These may be workers, they may and do advance knowledge, but they are never pioneers. Not to them is it given to open out great tracts of unexplored territory, or to view the promised land as from a mountain-top. Of them we shall not speak; we will concern ourselves only with the greatest, the epoch-making men, to whose life and work we and all who come after them owe so much. Such a man was Thales. Such was Archimedes, Hipparchus, Copernicus. Such pre-eminently was Newton.

Now I am not going to attempt a history of science. Such a work in ten lectures would be absurd. I intend to pick out a few salient names here and there, and to study these in some detail, rather than by attempting to deal with too many to lose individuality and distinctness.

We know so little of the great names of antiquity, that they are for this purpose scarcely suitable. In some departments the science of the Greeks was remarkable, though it is completely overshadowed by their philosophy; yet it was largely based on what has proved to be a wrong method of procedure, viz the introspective and conjectural, rather than the inductive and experimental methods. They investigated Nature by studying their own minds, by considering the meanings of words, rather than by studying things and recording phenomena. This wrong (though by no means, on the face of it, absurd) method was not pursued exclusively, else would their science have been valueless, but the influence it had was such as materially to detract from the value of their speculations and discoveries. For when truth and falsehood are inextricably woven into a statement, the truth is as hopelessly hidden as if it had never been stated, for we have no criterion to distinguish the false from the true.