scholarly journals On the measurement of high temperatures

1833 ◽  
Vol 2 ◽  
pp. 331-332
Keyword(s):  
High Temperatures ◽  
Noble Metals ◽  
Pure Gold ◽  
Compensation Principle ◽  
Melting Lead ◽  
Series Of Experiments ◽  
The Subject ◽  
The Many ◽  
The One ◽  
Considerable Depth

The author, after adverting to the many abortive endeavours of former experimentalists to obtain instruments for the accurate ad-measurement of high temperatures, and after suggesting doubts as to the confidence to which Wedgwood’s pyrometer is entitled, describes several attempts of his own to effect this very desirable object. In the course of his inquiries, a remarkable fact presented itself to his notice in the change which occurred in an index constructed on the compensation principle, and formed by two slips of metal, the one of silver and the other of gold, originally quite pure, and united without any alloy. In the course of a few years, although it had never been subjected to a heat above that of melting lead, the whole surface of the gold became converted into an alloy of silver, the impregnation extending gradually to a considerable depth in the gold, and destroying the sensibility of the instrument to changes of temperature. After trying various plans, he gave the preference to one founded on the following principles: namely, that the fusing points of the pure metals are fixed and determined; that those of the three noble metals, namely, silver, gold, and platina, comprehend a very extensive range of temperature; and that between these three fixed points in the scale, as many intermediate ones as may be required may be obtained by alloying the three metals together in different proportions. When such a series of alloys has been once prepared, the heat of any furnace may be expressed by the alloy of least fusibility which it is capable of melting. The determinations afforded by a pyrometer of this kind will, independently of their precision, have the advantage of being identifiable at all times and in all countries: the smallness of the apparatus is an additional recommendation, nothing more being necessary than a little cupel, containing in separate cells the requisite number of pyrometric alloys, each of the size of a pin’s head. The specimens melted in one experiment need only to be flattened under the hammer in order to be again ready for use. For the purpose of concisely registering the results, the author employs a simple decimal method of notation, which at once expresses the nature of the alloy, and its correspondence with the scale of temperature. Thus G. 23 P would denote an alloy of gold with 23 per cent. of platina. As the distance between the points of fusion of silver and of gold is not considerable, the author divides this distance on the scale into ten degrees; obtaining measures of each by a successive addition of 10 per cent. of gold to the silver, the fusion of which, when pure, marks the point of zero; while that of gold is reckoned at ten degrees. If minuter subdivisions were required for particular objects of research, these might easily be made, following always the decimal series. From the point of fusion of pure gold to that of pure platina, the author assumes 100 degrees, adding to the alloy which is to measure each in succession 1 per cent. of platina. Whether these hypothetical degrees represent equable increments of temperature is a question foreign to the purpose of this paper, and must be the subject of future investigation. The author then enters into a detailed account of the method he employed for insuring accuracy in the formation of the requisite series of alloys, and of various experiments undertaken to ascertain their fitness as measures of high temperatures. The determinations of the heats of the different furnaces adapted to particular objects, are given in a tabular form. The remaining portion of the paper contains the recital of the author’s attempts to determine by means of an apparatus connected with an air thermometer, the relation which the fusing point of pure silver bears to the ordinary thermometric scale. An extensive series of experiments, of which the results are given in a table, were made with this apparatus. From the data thus afforded, after making the necessary corrections, the author deduces the following results in degrees of Fahrenheit: viz. A full red heat 1200°; orange heat 1650°; melting point of silver (which had been estimated by Wedgewood at 4717°, and by Daniell at 2233°,) 1830°; of silver alloyed with one tenth gold 1920°. The paper is accompanied with drawings of the apparatus employed.

scholarly journals On a new register-pyrometer, for measuring the expansions of solids, and determining the higher degrees of temperature upon the common thermometric scale

1833 ◽  
Vol 2 ◽  
pp. 404-406
Keyword(s):  
Melting Point ◽  
High Temperatures ◽  
The Other ◽  
Royal Institution ◽  
Guyton De Morveau ◽  
Higher Temperature ◽  
The Subject ◽  
The Common ◽  
The One ◽  
Universal Application

In the year 1821, the author published in the Journal of the Royal Institution an account of a new pyrometer, and of some determinations of high temperatures, in connexion with the scale of the mercurial thermometer, obtained by its means. The use of the instrument then described was, however, limited; and the author was subsequently led to the invention of a pyrometer of a more universal application, both to scientific researches and to various purposes of art. Fie introduces the subject by an account of the late attempt of M. Guyton de Morveau, to employ the expansions of platina for the admeasurement of high temperatures, and for connecting the indications of Wedgwood’s pyrometer with the mercurial scale, and verifying its regularity. The experiments of that philosopher were by the contraction of porcelain, and by actual comparison with those of the platina pyrometer, at no higher temperature than the melting point of antimony; but they are sufficient to establish the existence of a great error in Wedgwood’s original estimation of his degrees up to that point. This he carries on by calculation, on the hypothesis of uniform progression of expansion, up to the melting point of iron; the construction of his instrument not admitting of its application to higher temperatures than a red heat, in which platina becomes soft and ductile. Mr. Daniell shows, by an examination of M. Guyton’s results, that he has failed in establishing the point he laboured to prove; namely, the regularity of the contraction of the clay pieces. The pyrometer of the author consists of two distinct parts; the one designated the register , the other the scale .

scholarly journals A miniaturização como procedimento de escrita / Miniaturization as a Writing Procedure

2019 ◽  
Vol 15 (1) ◽  
pp. 203
Author(s):  
Francisco Camêlo
Keyword(s):  
Walter Benjamin ◽  
De Se ◽  
Elective Affinities ◽  
Robert Walser ◽  
The Subject ◽  
The Many ◽  
The One ◽  
Short Essay ◽  
The Universe ◽  
Do So

Resumo: Propõe-se uma reflexão cruzada entre Walter Benjamin e Robert Walser, a partir de suas micrografias. Dentre os muitos objetos que colecionou durante a vida, Benjamin tinha especial apreço por livros infantis, miniaturas e brinquedos. Esse interesse pelo diminuto também se manifestava na extrema pequenez de sua letra e no desejo de chegar a cem linhas numa folha de carta de tamanho convencional, feito conseguido por Walser, que escrevia microtextos com uma grafia minúscula e sobre quem o próprio Benjamin redigiu um curtíssimo ensaio em 1929. Se, por um lado, a letra miniaturizada de Benjamin e de Walser aponta para um gesto de escrita que parece cifrar o conteúdo do texto, por outro lado, a micrografia de ambos diz do interesse mútuo de se esconder nas malhas textuais através de um apequenamento do eu pela escrita. Pode-se, ainda, aproximar a miniaturização da letra de uma estreita vinculação com o universo da infância, seja pelos personagens crianças e fracassados presentes na obra de Walser; seja pelo protagonismo que a infância como Denkbild (imagem de pensamento) assume nos escritos de Benjamin. A partir dessas afinidades eletivas, o artigo procura mostrar a miniaturização como um procedimento de escrita de Benjamin e de Walser através de paralelos entre suas micrografias e de comentários analítico-especulativos de ensaios de Benjamin e de contos de Walser.Palavras-chave: Walter Benjamin; Robert Walser; escrita; miniaturização, infância.Abstract: The article proposes a cross-reflection between Walter Benjamin and Robert Walser and finds its first intersection in the micrographs produced by them. Among the many objects collected during his lifetime, Benjamin seems to have had a special appreciation for children’s books, miniatures and toys. This interest in small items was also manifested in the extreme smallness of his handwriting and in the desire to write one hundred lines in a conventional-size paper – this last one achieved by Walser, who wrote microtexts in a miniscule handwriting and was also the subject of a short essay Benjamin wrote in 1929. If, on the one hand, the miniaturized handwritings of both Benjamin and Walser point to a manner of writing that seems to encrypt the content of texts, on the other hand, the micrographies constructed by both men state a mutual interest in hiding amongst the textual mesh through the suppression of the self in writing. One can, still, liken the miniaturized handwriting with the universe of childhood, be it by the character of the child or the character of the so-called underdog (both present in the works of Walser) or by the protagonism that a childhood-as-Denkbird (image of thought) assumes in Benjamin’s work. Based on these elective affinities, the article seeks to show the miniaturization as a writing procedure employed by both Benjamin and Walser, and it will do so by establishing parallels between the micrographs of the latter and the analytical-speculative commentaries present in Benjamin’s essays and in Walser’s tales.Keywords: Walter Benjamin; Robert Walser; writing; miniaturization; childhood.

Forensics: Assessing model goodness: A machine learning view

2018 ◽  
Vol 02 (02) ◽  
pp. 1850015 ◽  
Author(s):  
Joseph R. Barr ◽  
Joseph Cavanaugh
Keyword(s):  
Machine Learning ◽  
Data Mining ◽  
Statistical Model ◽  
Statistical Learning ◽  
Statistical Models ◽  
The Subject ◽  
The Many ◽  
The One ◽  
Compare And Contrast ◽  
Learning Data

It is not unusual that efforts to validate a statistical model exceed those used to build the model. Multiple techniques are used to validate, compare and contrast among competing statistical models: Some are concerned with a model’s ability to predict new data while others are concerned with model descriptiveness of the data. Without claiming to provide a comprehensive view of the landscape, in this paper we will touch on both aspects of model validation. There is much more to the subject and the reader is referred to any of the many classical statistical texts including the revised two volumes of Bickel and Docksum (2016), the one by Hastie, Tibshirani, and Friedman [The Elements of Statistical Learning: Data Mining, Inference, and Predication, 2nd edn. (Springer, 2009)], and several others listed in the bibliography.

The Position of the Insurance Press in relation to Insurance Offices and Insurance Interests

1881 ◽  
Vol 23 (1) ◽  
pp. 18-28
Author(s):  
Cornelius Walford
Keyword(s):  
The Other ◽  
Individual Responsibility ◽  
The Press ◽  
The Subject ◽  
The Many ◽  
The One ◽  
The Individual

I think the time has arrived when the subject indicated in the title of this paper may be fairly and fully considered. It is certainly one which must frequently have presented itself to the managerial mind; and there can be no reason why this question should not be discussed with as much philosophic calmness as any of the many theoretical problems, or points in practice, which continually present themselves for reflection, and perchance for decision.The point may indeed arise—whether I am the proper person to introduce the topic. I take the individual responsibility of deciding in the affirmative. I have, on the one hand, been as frequently assailed by the insurance press, as any one, and, on the other, received as much kindness and friendly recognition as any man can desire, and more than I claim to deserve. It may be that in either case the extreme has been reached, or passed. I have the advantage of having been a writer upon the press, insurance and general, from the days of my youth, and I say at once that my sympathies are largely on that side. But I think that the familiarity which draws me to the side of its virtues, also renders me, at least in some degree, cognizant of its short-comings. I have the further advantage of having been on various occasions consulted by managers on the one hand, and by editors on the other, upon the points which I now proceed to discuss.

scholarly journals The field of force and the form of the carbon dioxide molecule. - Part I. Thermal diffusion in mixtures containing carbon dioxide

1932 ◽  
Vol 134 (825) ◽  
pp. 613-627 ◽  
Keyword(s):  
Carbon Dioxide ◽  
Thermal Diffusion ◽  
High Temperatures ◽  
Gradual Increase ◽  
General Survey ◽  
Carbon Dioxide Molecule ◽  
Original Intention ◽  
Series Of Experiments ◽  
The Subject ◽  
Previous Series

All experimental workers on thermal diffusion have examined mixtures containing carbon dioxide. We find, however, that mixtures containing this gas still appear to present novel and interesting features. An account of these special features will be given in this work. In a previous series of experiments it was found that k t , the ratio of the coefficient of thermal diffusion to the coefficient of ordinary diffusion, generally tends to decrease gradually at low temperatures. We decided, therefore, to make further experiments with the object of finding whether any change in k t also occurred at high temperatures. The original intention was to make a general survey of a number of gas mixtures working up to about 750° C. or 1000° C. After this work was begun Lugg published an account of his experiments showing that k t for a mixture of hydrogen and carbon dioxide is greater at high temperatures than it is at ordinary temperatures. This contribution to the subject furnished a valuable connection between the results obtained by Elliott and Masson and the lower results we had previously obtained using a, smaller range of temperature. From his results Lugg concluded that there is a gradual increase in k t as the temperature is raised.

The Two Ends and the Middle Way A Suggested Reconstruction

1932 ◽  
Vol 64 (1) ◽  
pp. 114-125
Author(s):  
C. A. F. Rhys Davids
Keyword(s):  
Religious History ◽  
Middle Way ◽  
Historical Importance ◽  
History Of ◽  
The Will ◽  
The Subject ◽  
The Many ◽  
The One ◽  
The Mind ◽  
General Assent

Of the five opportunities given me these thirty-nine years for such a talk on such an occasion as this, the present one may well be the last. I have on these occasions considered, in the Buddhist field, Women, the Will, Natural Causation, and the Man as Real. I would now say a few words on that which is, historically speaking, the most central subject of all—the subject which is, by general assent, within and without that religion, the New Word with which it was introduced, the first Mantra recorded as of the Founder of it, the so-called Benares ‘sermon’. For we may talk much about legends of him on the one hand, or about the many ways in which his teaching expanded at later periods, in so-called philosophy and in this and that word-value, obscuring the man-value, but the one thing of chief historical importance is and remains the Mantras he first uttered as teacher, and their significance in the religious history of the there and then. To this I would add, in the pertinent phrase of a recent synoptical narrative, “the meaning which these will have had in the mind of their original author.”

The Legal Status of American Political Parties, I

1940 ◽  
Vol 34 (3) ◽  
pp. 439-455 ◽  
Author(s):  
Joseph R. Starr
Keyword(s):  
Political Parties ◽  
Legal Status ◽  
Practical Importance ◽  
The United States ◽  
The Public ◽  
Legal Position ◽  
The Subject ◽  
The Government ◽  
The Many ◽  
The One

The legal status of political parties in the United States is far from being clearly defined. On the one hand, we do not have a mass of legislation and court decisions clearly constituting the political party as a branch of the government, as in the leading fascist countries of Europe; and, on the other hand, we do not have a situation similar to that of Great Britain or France, where political parties are practically unregulated except for laws designed to control subversive groups. To gain a concept of the legal position of American political parties, a great deal of legislation which differs widely in many particulars among the forty-eight states must be surveyed, and certain categories of common and public law must be explored. Even when the many branches of the law that seem to impinge upon the subject have been brought into view, the legal position of our political parties still seems elusive and indefinite. Yet the subject is one of considerable practical importance, since the near future is likely to bring insistent demands for new and more drastic regulation of political parties. A consideration of the rights of American political parties, and the scope of the powers of the legislature to interfere with parties in the public interest, therefore seems appropriate at the present time.

III. On the spectra of metalloids. Spectrum of oxygen

1878 ◽  
Vol 27 (185-189) ◽  
pp. 383-388 ◽  
Keyword(s):  
Molecular Structure ◽  
Continuous Spectrum ◽  
The Other ◽  
Special Investigation ◽  
The Subject ◽  
To Come ◽  
The Many ◽  
The One ◽  
Solid Bodies ◽  
Fixed Period

The many unexplained phenomena attending the passage of electricity through gases will probably for some time to come occupy the attention of experimental physicists. It is desirable that the subject should be approached from as many different sides as possible. One of our most powerful instruments of research is the spectroscope, but before it can be applied to the study in question we have to settle the chemical origin of the different spectra, which we observe in vacuum tubes, and to discuss in what way such spectra are liable to change under different circumstances. A special investigation has to be made for each gas; we have to study the effect of various impurities, the influence of the electrodes, and that of the glass which in the tubes generally used is considerably heated up by the spark. I have chosen oxygen as a first subject of investigation. Though Plücker and Wüllner have, as far as their experiments went, accurately described the phenomena seen in oxygen tubes, the following contains much that is new, and will put some of the older facts on a firmer basis. As some of the facts brought to light by the investigation bear directly on the question of double spectra, our knowledge on that point must be briefly referred to. We divide all known spectra into three orders. Continuous spectra, channelled space spectra, and line spectra. With regard to continuous spectra, it is shown that the older statement which limited them to liquid and solid bodies is no longer tenable. Most gases give continuous spectra long before they condense. Two theories of continuous spectra are noticed. The one considers that the vibrations of a molecule always tend to take place in a fixed period, but that the impacts of other molecules may, when the pressure is great or in liquid and solid bodies, prevent complete oscillations taking place, and thus produce a continuous spectrum. The other theory considers that, when a gas condenses, molecular combinations take place, which make the molecular structure more complicated, and may produce channelled space spectra or continuous spectra. According to the latter theory such molecular combinations are possible before the gas condenses, and thus the state of aggregation of the gas only indirectly affects the spectrum. The latter theory seems to be more consistent with experiment than the former one. For instance, it is shown that oxygen gives a continuous spectrum at the lowest temperature at which it is luminous. If the temperature be raised, the continuous spectrum is replaced by a line spectrum. This seems to be inexplicable by theory of molecular impacts.

scholarly journals A Skeptical Eye on Psi

2020 ◽  
Author(s):  
Eric-Jan Wagenmakers ◽  
ruud wetzels ◽  
Denny Borsboom ◽  
Rogier Kievit ◽  
Han van der Maas
Keyword(s):  
Empirical Research ◽  
Sensory Perception ◽  
The Other ◽  
Other Hand ◽  
Statistical Support ◽  
The Future ◽  
Series Of Experiments ◽  
The Many ◽  
The One ◽  
Meta Analyses

Research on extra-sensory perception or psi is contentious and highly polarized. On the one hand, its proponents believe that evidence for psi is overwhelming, and they support their case with a seemingly impressive series of experiments and meta-analyses. On the other hand, psi skeptics believe that the phenomenon does not exist, and the claimed statistical support is entirely spurious. We are firmly in the camp of the skeptics. However, the main goal of this chapter is not to single out and critique individual experiments on psi. Instead, we wish to highlight the many positive consequences that psi research has had on more traditional empirical research, an influence that we hope and expect will continue in the future.

Writing of the Formless

2016 ◽  
Author(s):  
Jaime Rodríguez Matos
Keyword(s):  
Jose Lezama Lima ◽  
Ontological Difference ◽  
Central Concern ◽  
History Of ◽  
Varying Length ◽  
The Subject ◽  
The Many ◽  
The One ◽  
Central Tension

The second part of the book is not divided into chapters. Rather, it is composed of sections of varying length. Its central concern is to trace the treatment of the question of the void in the writing and thought of José Lezama Lima. This entails an examination of Lezama’s reading of the history of void throughout the Western philosophical, religious, political, and artistic traditions. The central tension of this section lies in tracing Lezama’s engagement and ultimate unworking of the structure of a transcendental dictation, which informs and splits the subject, and which is the structure central to modern political and aesthetic subjectivity. Taken together, these readings can be understood as the unfolding of Lezama’s own highly idiosyncratic and baroque take on the question of the ontological difference (which he ironically and famously dismissed in his comments on Heidegger). The central insight that ensues is that of a thought on time that is beyond the forming or framing dialectic of the One and the Many. It is in this idea of a time beyond Time(s) that we find Lezama’s most radical political insights.

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