A Short History of ScienceMacmillan, 1917 - 474 σελίδες |
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Αποτελέσματα 1 - 5 από τα 59.
Σελίδα 27
... equal weights of water corresponded equal intervals of time . Starting the flow at the moment the upper edge of the sun first appeared in the east and stopping as soon as the whole sun was visible , the amount of water collected was ...
... equal weights of water corresponded equal intervals of time . Starting the flow at the moment the upper edge of the sun first appeared in the east and stopping as soon as the whole sun was visible , the amount of water collected was ...
Σελίδα 40
... equal parts , the rate of flow in the clepsydra required continual adjustment . Ingenious improvements were made in the mechanism in course of time , but in considering the work of the Greek astronomers , the impossibility of what we ...
... equal parts , the rate of flow in the clepsydra required continual adjustment . Ingenious improvements were made in the mechanism in course of time , but in considering the work of the Greek astronomers , the impossibility of what we ...
Σελίδα 44
... equal ; when two straight lines cut each other the opposite angles are equal ; the first proof that the circle is bisected by its diameter ; the in- scription of the right triangle in the semicircle ; the measurement of height by shadow ...
... equal ; when two straight lines cut each other the opposite angles are equal ; the first proof that the circle is bisected by its diameter ; the in- scription of the right triangle in the semicircle ; the measurement of height by shadow ...
Σελίδα 51
... equal equilateral triangles have a common vertex they will when cut or folded so that their edges are brought together , form a solid angle , and a fourth equal triangle will complete a regular tet- rahedron . Similarly , if we start ...
... equal equilateral triangles have a common vertex they will when cut or folded so that their edges are brought together , form a solid angle , and a fourth equal triangle will complete a regular tet- rahedron . Similarly , if we start ...
Σελίδα 53
... equal sides being taken as 1 , the length of the hypotenuse could be only approximately expressed . It cannot indeed be exactly expressed by any whole number , or fraction ; it is irrational . If it is true as Whewell says , that the ...
... equal sides being taken as 1 , the length of the hypotenuse could be only approximately expressed . It cannot indeed be exactly expressed by any whole number , or fraction ; it is irrational . If it is true as Whewell says , that the ...
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algebra Almagest analytic geometry ancient animals appeared Arabic Archimedes Aristotle arithmetic astronomy calculus centre CHAPTER chemical chemistry circle conic sections Copernicus cosmogony cubic equation curve Descartes Diophantus discovered discovery disease distance doctrine earth eighteenth century electricity elements engineer equal equations Euclid Europe evolution experiment forces Galileo Galileo Galilei geology geometry Greek Greek mathematics heat heavenly bodies heavens Hipparchus Hippocrates history of science Holy human Huygens hypothesis ideas important invention investigation Jupiter Kepler knowledge known later laws learning light mathe mathematical science mathematicians matical matter measure mechanics ment method microscope modern moon motion natural Newton nineteenth century observed orbits origin period phenomena philosophy planets Plato principle problem progress Ptolemy published Pythagoras regarded Roman says scientific special creation sphere spherical stars telescope theorems theory things tion treatise triangle Tycho Brahe universe velocity
Δημοφιλή αποσπάσματα
Σελίδα 341 - I often say that when you can measure what you are speaking about and express it in numbers you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind...
Σελίδα 351 - It is hardly necessary to add that anything which any insulated body or system of bodies can continue to furnish without limitation cannot possibly be a material substance ; and it appears to me to be extremely difficult, if not quite impossible, to form any distinct idea of anything capable of being excited and communicated in the manner in which heat was excited and communicated in these experiments except it be motion.
Σελίδα 199 - Rather admire; or if they list to try Conjecture, he his fabric of the Heavens Hath left to their disputes, perhaps to move His laughter at their quaint opinions wide Hereafter, when they come to model Heaven And calculate the stars, how they will wield The mighty frame; how build, unbuild, contrive To save appearances; how gird the sphere With centric and eccentric scribbled o'er, Cycle and epicycle, orb in orb...
Σελίδα 399 - I will keep this oath and this stipulation— to reckon him who taught me this art equally dear to me as my parents, to share my substance with him and relieve his necessities if required, to look upon his offspring in the same footing as my own brothers and to teach them this art if they shall wish to learn it without fee or stipulation...
Σελίδα 300 - I do not know what I may appear to the world, but to myself I seem to have been only like a boy playing on the sea-shore, and diverting myself in now and then finding a smoother pebble or a prettier shell than ordinary, whilst the great ocean of truth lay all undiscovered before me.
Σελίδα 331 - Given for one instant an intelligence which could comprehend all the forces by which nature is animated and the respective situation of the beings who compose it an intelligence sufficiently vast to submit these data to analysis it would embrace in the same formula the movements of the greatest bodies of the universe and those of the lightest atom...
Σελίδα 269 - Our business was (precluding matters of Theology and state affairs) to discourse and consider of Philosophical Enquiries, and such as related thereunto : as physick, anatomy, geometry, astronomy, navigation, staticks, magneticks, chymicks, mechanicks, and natural experiments ; with the state of these studies, as then cultivated at home and abroad.
Σελίδα 422 - Vaccinae, A Disease Discovered in Some of the Western Counties of England. Particularly Gloucestershire, and Known by the Name of the Cow Pox...
Σελίδα 399 - I swear by Apollo the physician and Aesculapius and health and all-heal and all the gods and goddesses that according to my ability and judgment I will keep this oath and this stipulation— to reckon him who taught me this art equally dear to me as my parents...
Σελίδα 39 - Go, and say to Hezekiah, Thus saith the Lord, the God of David thy father : I have heard thy prayer, I have seen thy tears ; behold, I will add unto thy days fifteen years.