принципы
Источник: «Руководство по паровым машинам»
Ренкин, Уильям Джон цитаты
Ренкин, Уильям Джон: Цитаты на английском языке
"On the Harmony of Theory and Practice in Mechanics" (Jan. 3, 1856)
Контексте: In treating of the practical application of scientific principles, an algebraical formula should only be employed when its shortness and simplicity are such as to render it a clearer expression of a proposition or rule than common language would be, and when there is no difficulty in keeping the thing represented by each symbol constantly before the mind.<!--p. 177
"On the Harmony of Theory and Practice in Mechanics" (Jan. 3, 1856)
Контексте: The ascertainment and illustration of truth are the objects; and structures and machines are looked upon merely as natural bodies are; namely, as furnishing experimental data for the ascertaining of principles and examples for their application.<!--p. 176
"On the Harmony of Theory and Practice in Mechanics" (Jan. 3, 1856), p. 176
“The evil influence of the supposed inconsistency of theory and practice upon speculative science”
"On the Harmony of Theory and Practice in Mechanics" (Jan. 3, 1856)
Контексте: The evil influence of the supposed inconsistency of theory and practice upon speculative science, although much less conspicuous than it was in the ancient and middle ages, is still occasionally to be traced. This it is which opposes the mutual communication of ideas between men of science and men of practice, and which leads scientific men sometimes to employ, on problems that can only be regarded as ingenious mathematical exercises, much time and mental exertion that would be better bestowed on questions having some connection with the arts, and sometimes to state the results of really important investigations on practical subjects in a form too abstruse for ordinary use; so that the benefit which might be derived from their application is for years lost to the public; and valuable practical principles which might have been anticipated by reasoning, are left to be discovered by slow and costly experience.<!--pp. 175
Источник: A Manual of the Steam Engine and Other Prime Movers (1859), p. 31
Контексте: Hypothesis Of Molecular Vortices. In thermodynamics as well as in other branches of molecular physics, the laws of phenomena have to a certain extent been anticipated, and their investigation facilitated, by the aid of hypotheses as to occult molecular structures and motions with which such phenomena are assumed to be connected. The hypothesis which has answered that purpose in the case of thermodynamics, is called that of "molecular vortices," or otherwise, the "centrifugal theory of elasticity. (On this subject, see the Edinburgh Philosophical Journal, 1849; Edinburgh Transactions, vol. xx.; and Philosophical Magazine, passim, especially for December, 1851, and November and December, 1855.)
"On the Harmony of Theory and Practice in Mechanics" (Jan. 3, 1856)
Контексте: Another evil, and one of the worst which arises from the separation of theoretical and practical knowledge, is the fact that a large number of persons, possessed of an inventive turn of mind and of considerable skill in the manual operations of practical mechanics, are destitute of that knowledge of scientific principles which is requisite to prevent their being misled by their own ingenuity. Such men too often spend their money, waste their lives, and it may be lose their reason in the vain pursuits of visionary inventions, of which a moderate amount of theoretical knowledge would be sufficient to demonstrate the fallacy; and for want of such knowledge, many a man who might have been a useful and happy member of society, becomes a being than whom it would be hard to find anything more miserable.
The number of those unhappy persons — to judge from the patent-lists, and from some of the mechanical journals — must be much greater than is generally believed.<!--p. 176
p, 125
"On the Harmony of Theory and Practice in Mechanics" (Jan. 3, 1856)
p, 125
"On the Harmony of Theory and Practice in Mechanics" (Jan. 3, 1856)
Источник: A Manual of the Steam Engine and Other Prime Movers (1859), p. 31
Источник: "Outlines of the Science of Energetics," (1855), p. 121; Lead paragraph: Section "What Constitutes A Physical Theory"
"On the Harmony of Theory and Practice in Mechanics" (Jan. 3, 1856)
Контексте: The objects of instruction in purely scientific mechanics and physics are, first, to produce in the student that improvement of the understanding which results from the cultivation of natural knowledge, and that elevation of mind which flows from the contemplation of the order of the universe; and secondly, if possible, to qualify him to become a scientific discoverer.<!--p. 176
Manual of Applied Mechanics, (1858) London and Glasgow : Richard Griffin and Company, p. 630
p, 125
"On the Harmony of Theory and Practice in Mechanics" (Jan. 3, 1856)
p, 125
"On the Harmony of Theory and Practice in Mechanics" (Jan. 3, 1856)
Источник: "Outlines of the Science of Energetics," (1855), p. 213
p, 125
"On the Harmony of Theory and Practice in Mechanics" (Jan. 3, 1856)
p, 125
"On the Harmony of Theory and Practice in Mechanics" (Jan. 3, 1856)
p, 125
"On the Harmony of Theory and Practice in Mechanics" (Jan. 3, 1856)
p, 125
"On the Harmony of Theory and Practice in Mechanics" (Jan. 3, 1856)
p, 125
"On the Harmony of Theory and Practice in Mechanics" (Jan. 3, 1856)
"Introductory Lecture on the Harmony of Theory and Practice in Mechanics" (1856), p. 4
"On the Centrifugal Theory of Elasticity as applied to Gases and Vapours" in The London, Edinburgh and Dublin Philosophical Magazine and Journal of Science (July-December 1851), p. 510
p, 125
"On the Harmony of Theory and Practice in Mechanics" (Jan. 3, 1856)
p, 125
"On the Harmony of Theory and Practice in Mechanics" (Jan. 3, 1856)
Источник: A Manual of the Steam Engine and Other Prime Movers (1859), p. 27
Источник: "Outlines of the Science of Energetics," (1855), p. 121; Second paragraph
"On the Harmony of Theory and Practice in Mechanics" (Jan. 3, 1856)
The extent of intercourse, and of mutual assistance, between men of science and men of practice, the practical knowledge of scientific men, and the scientific knowledge of practical men, have been for some time steadily increasing; and that combination and harmony of theoretical and practical knowledge—that skill in the application of scientific principles to practical purposes, which in former times was confined to a few remarkable individuals, now tends to become more generally diffused.
"On the Harmony of Theory and Practice in Mechanics" (Jan. 3, 1856)