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SIR ISAAC NEWTON  lbert in s tein F ortunate Newton, happy childhood of s cienc e  H e who ha s time and t r anq ui llity can by rea in g this book liv e again the wond e rful event s which the gre a tN e wton experienc e d in hi s young days . Nature to him was an open book, who s e le tt er s he could r ad without effort . The conceptions which he u s ed to reduce t he material of experience to order seemed to flow spontaneou ly from experience i t s elf, from the eautiful e x periments which he r nged in order like playthings and des cribe s with and affectionate wealth of etail . In on e person he combined the e xp e rimenter, the theorist, the mechanic and, not lea t, the artist in exposition. He s t and s b e fore u s s trong, certain and alone . his joy in creation and his minute precision are e vident in every word and in every figure . R e flexion, refraction, the form tion of ima ges by lense s , the mode of operation o f the eye, the spectral decomposition and the recomposit on of the ifferent kinds o f Iight, the invention of the reflecting telescope, the first foundations of colour t h e ory, the elementary theory of the rainbow pas s by u s in procession, and finally co m e hi s observations of the colours of thin film s a s the origin of the next great t heoretical advance, which had to awaít, over a hundred year s , the coming of Thoma s Young . Newton  s age has long since been passed through the sie e of oblivion, the doubtful striving and s uffer i ng of his generati n has vanished from our ken¡ t he work s of some few great thinkers and artists have remained, to delight and e nnoble u s and those who come afte us . Newton s discoveries have passed into th e s tock of accepted knowledge : this new edition of his work n optics is nevertheless lo be welcomed with warmest thanks, because it alone can afford u s the e njoyment of a look at the personal act i vity of this unique mand o ISAAC NEWTON  1 lbert instein iAfortunado Newton, feliz runez de la ciencia Aquel que disponga de tiempo y de tranquilidad, podrá, al leer este libro, V lVlrnuevamente los maravillosos eventos que el gran Newton experimentó en su j uventud. La naturaleza fue para él, un libro abierto, cuyas página s podia leer sin e s fu erzo . L s c o nc e p t o s que usó al conv e rtir e l material de la e xperiencia en orden, parec í a n f lu í r es p o n neament e d e la ex p er iencia mi s ma y de lo s b e llo s e xperimentos que ali n e ab a como j ug uete s y d es cribí a con una ca r iño s a riqueza de d e talles . En  s e c o mb i n a n : e l exp e rimentador, el teórico, el m e cánico  no m e no s e l artista por  1) Pr e lado a la ed , NEWTON, O/>liclrs , Dover Publ . , New York . R e producci ó n y traducción

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SIR ISAAC NEWTON

Albert Einstein

Fortunate Newton, happy childhood of science! He who has time and

tranquillity can by reading this book live again the wonderful events which the

great Newton experienced in his young days. Nature to him was an open book,

whose letters he could read without effort. The conceptions which he used to reduce

the material of experience to order seemed to flow spontaneously from experience

itself, from the beautiful experiments which he ranged in order like playthings and

describes with and affectionate wealth of detail. In one person he combined the

experimenter, the theorist, the mechanic and, not least, the artist in exposition. He

stands before us strong, certain and alone . his joy in creation and his minute precision

are evident in every word and in every figure.

Reflexion, refraction, the formation of images by lenses, the mode of operation

of the eye, the spectral decomposition and the recomposition of the different kinds

of Iight, the invention of the reflecting telescope, the first foundations of colour

theory, the elementary theory of the rainbow pass by us in procession, and finally

come his observations of the colours of thin films as the origin of the next great

theoretical advance, which had to awaít, over a hundred years, the coming of

Thomas Young.

Newton's age has long since been passed through the sieve of oblivion,

the doubtful striving and suffering of his generation has vanished from our ken¡

the works of some few great thinkers and artists have remained, to delight and

ennoble us and those who come after us. Newton's discoveries have passed into

the stock of accepted knowledge: this new edition of his work on optics is nevertheless

lo be welcomed with warmest thanks, because it alone can afford us the enjoyment

of a look at the personal activity of this unique mando

ISAAC NEWTON (1)

Albert Einstein

iAfortunado Newton, feliz runez de la ciencia!

Aquel que disponga de tiempo y de tranquilidad, podrá, al leer este libro,

VlVlrnuevamente los maravillosos eventos que el gran Newton experimentó en su

juventud.La naturaleza fue, para él, un libro abierto, cuyas páginas podia leer sin

esfuerzo. Los conceptos que usó al convertir el material de la experiencia en orden,

parecían fluír espontáneamente de la experiencia misma y de los bellos experimentos

que alineaba como juguetes y describía con una cariñosa riqueza de detalles. En

é l se combinan: el experimentador, el teórico, el mecánico y no menos el artista por

(1) Prelado a la ed, NEWTON, O/>liclrs, Dover Publ., New York. Reproducción y traducción

autori-udas por Dover Publications. Trad. de Fernando Chavarría.

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336 ALBERT EINSTElN

su exposición. Se levanta frente a nosotros fuerte, acertado y solo; su alegría en la

creaaon y su precisión minuciosa son evidentes en cada palabra y en cada número.

La reflexión, la refracción, la formación de imágenes por medio de lentes;

la forma de actuar el ojo; la descomposición espectral y la recomposición de las

diferentes clases de luz; la invención del telescopio de reflexión; los primeros funda-mentos de la teoría de los colores; la teoría elemental del arco iris, todos pasan frente

a nosotros en secuencia y, finalmente vienen sus observaciones sobre los colores de

las películas delgadas, que constituyen el origen del siguiente gran avance teórico que

tuvo que esperar más de cien años hasta la llegada de Thomas Young.

La época de Newton hace tiempo pasó por el cedazo del olvido y los fallidos

esfuerzos y sufrimientos de su generación se han borrado de nuestro horizonte; los'

trabajos de unos grandes pensadores y artistas han permanecido, para deleitamos

y ennoblecemos a nosotros y a los que vengan después de nosotros. Los descubri-

mientos de Newton han pasado a ser capital de conocimiento aceptado: esta nueva

edición de su trabajo sobre óptica debe ser recibida con calurosa gratitud ya queeste libro, por sí solo, puede regocijamos al presentar la actividad personal de este

hombre extraordinario.