A method for observing the eclipses of the moon, free from the common inconveniencies, as it was left by the learned Mr. Rook, late Gresham-Professor of Geometry

1665 ◽  
Vol 1 (22) ◽  
pp. 388-390
Keyword(s):  
The Moon ◽  

Eclipses of the moon are observed for two principal ends; one astronomical, that by comparing observations with calculations, the Theory of the moons motion may be perfected, and the tables thereof reformed: the other, geographical, that by comparing among themselves the observations of the same ecliptick phases, made in divers places, the difference of meridians or longitudes of those places may be discerned.

1827 ◽  
Vol 117 ◽  
pp. 286-296 ◽  

In the Philosophical Transactions for 1826, Part II. Mr. Herschel has given a detailed account of observations, which were made in the month of July, 1825, for the purpose of ascertaining the difference of the meridians of the Royal Observatories of Greenwich and Paris, with a computation of these observations, from which the most probable value of the difference of longitude appears to be 9 m 21 s. 6. But I have perceived that in the copy of the observations delivered to him from the Royal Observatory of Greenwich, an error of one second has been committed; as the true sidereal time of the observation made there on 21st July, ought to be 17 h 38 m 57·12 in place of 17 h 38 m 56 s. 10, set down in the Table p. 104, which he informs me was computed at the Observatory, and officially communicated to him from the Astronomer Royal. This error seems to have had its origin in the little Table at the bottom of page 103; for, on subtracting the error of the clock, 47 s. 37, from the time 18 h 8 m 30 s. 40, the true sidereal time is 18 h 7 m 43 s. 03, instead of 18 h 7 m 42 s. 03, there given. The error in the result of that day’s observations, arising from this cause, has been partly compensated by a mistake of three tenths of a second, which has occurred in calculating the combined observations of the same day, the gain of mean on sidereal time being stated to be — 4 s. 54 (pp. 120 and 122), in place of — 4 s. 24. On checking the other observations, a few trifling alterations appear to be necessary upon the Greenwich Table of sidereal time, from the data given along with it. These seem to be occasioned by different methods of calculation, and indeed are hardly worthy of notice. The French astronomers not having given the data on which the calculations of the sidereal times at Paris are founded, they are assumed to be correct.


1832 ◽  
Vol 122 ◽  
pp. 539-574 ◽  

I have for some time entertained an opinion, in common with some others who have turned their attention tot he subject, that a good series of observations with a Water-Barometer, accurately constructed, might throw some light upon several important points of physical science: amongst others, upon the tides of the atmosphere; the horary oscillations of the counterpoising column; the ascending and descending rate of its greater oscillations; and the tension of vapour at different atmospheric temperatures. I have sought in vain in various scientific works, and in the Transactions of Philosophical Societies, for the record of any such observations, or for a description of an instrument calculated to afford the required information with anything approaching to precision. In the first volume of the History of the French Academy of Sciences, a cursory reference is made, in the following words, to some experiments of M. Mariotte upon the subject, of which no particulars appear to have been preserved. “Le même M. Mariotte fit aussi à l’observatoire des experiences sur le baromètre ordinaire à mercure comparé au baromètre à eau. Dans l’un le mercure s’eléva à 28 polices, et dans Fautre l’eau fut a 31 pieds Cequi donne le rapport du mercure à l’eau de 13½ à 1.” Histoire de I'Acadérmie, tom. i. p. 234. It also appears that Otto Guricke constructed a philosophical toy for the amusement of himself and friends, upon the principle of the water-barometer; but the column of water probably in this, as in all the other instances which I have met with, was raised by the imperfect rarefaction of the air in the tube above it, or by filling with water a metallic tube, of sufficient length, cemented to a glass one at its upper extremity, and fitted with a stop-cock at each end; so that when full the upper one might be closed and the lower opened, when the water would fall till it afforded an equipoise to the pressure of the atmo­sphere. The imperfections of such an instrument, it is quite clear, would render it totally unfit for the delicate investigations required in the present state of science; as, to render the observations of any value, it is absolutely necessary that the water should be thoroughly purged of air, by boiling, and its insinuation or reabsorption effectually guarded against. I was convinced that the only chance of securing these two necessary ends, was to form the whole length of tube of one piece of glass, and to boil the water in it, as is done with mercury in the common barometer. The practical difficulties which opposed themselves to such a construction long appeared to me insurmount­able; but I at length contrived a plan for the purpose, which, having been honoured with the approval of the late Meteorological Committee of this Society, was ordered to be carried into execution by the President and Council.


Author(s):  
Alexander Murray

People with a logical turn of mind say that the history of the world can be summarised in a sentence. A précis of mediaval historian Richard William Southern's work made in that spirit would identify two characteristics, one housed inside the other, and both quite apart from the question of its quality as a work of art. The first is his sympathy for a particular kind of medieval churchman, a kind who combined deep thought about faith with practical action. This characteristic fits inside another, touching Southern's historical vision as a whole. Its genesis is traceable to those few seconds in his teens when he ‘quarrelled’ with his father about the Renaissance. The intuition that moved him to do so became a historical fides quaerens intellectum. Reflection on Southern's life work leaves us with an example of the service an historian can perform for his contemporary world, as a truer self-perception seeps into the common consciousness by way of a lifetime of teaching and writing, spreading out through the world (all Southern's books were translated into one or more foreign language).


Author(s):  
Sneha Upreti

The word bioentrepreneurship and entrepreneurship share the similarity in the fact that they must have a great and an innovative idea behind starting a business setup and to raise an investment. Also, they both must have a great idea about marketing of the related products and managing their start-up. If we talk about the difference, the common difference is the sector or field in which a startup is carrying on. In simple words, entrepreneurship is the process of launching any new business based on an innovative idea. On the other hand, bioentrepreneurship is the process that is started in the field of science (i.e., biotechnology). Nowadays, bio-industrialization is the key to being a modern and developed country, and this is the only reason bioentrepreneurs are highly in demand. Thus, this chapter will help you to understand the pillars to setup a startup based on biotechnology that has an excellent future perspective not only for entrepreneurs but also for the nation.


PMLA ◽  
2012 ◽  
Vol 127 (4) ◽  
pp. 954-962
Author(s):  
Margaret Ferguson

On the one hand, the gift presents itself as a radical Other of the commodity—and therefore also of work, insofar as the latter is understood as an investment of time and energy made in the expectation of wages or profit. On the other hand, the idea of the gift seems constantly to be drawn back under the horizon of rational exchange, and to be thus endlessly re-revealed as a secret ally of both work and the Work.—Scott Cutler Shershow, The Work and the GiftI have put together all these details to convince you that this recommendation of mine is something out of the common.Quae ego omnia collegi, ut intellegeres non vulgarem esse commendationem hanc meam.—Cicero, Epistulae ad familiares, book 13LAST FALL I FOUND IN MY OFFICE MAILBOX AN ENVELOPE FROM A SOPHOMORE ENGLISH MAJOR WHO HAD ASKED ME DURING THE SUMMER for a last-minute letter of recommendation for a scholarship competition. The envelope contained a handwritten thank-you note—and a gift certificate for a local restaurant. I e-mailed the student to thank her and to tell her that I couldn't accept the gift certificate since the letter I had written for her was part of my job as a teacher. She insisted; I insisted. She said that several teachers had turned her down before I agreed (from a hotel in Germany) to write for her. I felt rueful, as well as grateful to her for the token of gratitude that I couldn't accept. Eventually she won the debate: I accepted the printed piece of paper and took my daughters out to a free lunch.


2010 ◽  
Vol 3 (1) ◽  
pp. 74-94 ◽  
Author(s):  
Daniël Van Olmen

This article examines the English and Dutch imperatives of intentional visual and auditory perception and in particular their use as pragmatic markers. Look, listen, kijk ‘look’ and luister ‘listen’ are compared with respect to frequency, distribution and usage. The difference between look and kijk, on the one hand, and listen and luister, on the other, is argued to be indicative of a more general cross-linguistic tendency. This tendency is explained in terms of the imperatives’ effectiveness in and likely recruitment for what has traditionally been called attention-getting and in terms of the common view of the nature of visual and auditory perception.


2005 ◽  
Vol 83 (9) ◽  
pp. 1365-1371 ◽  
Author(s):  
Ik-Hwan Um ◽  
Ji-Youn Lee ◽  
Sun-Young Bae ◽  
Erwin Buncel

We report on a nucleophilic study of esters R-C(=X)-Y-Ar in which the electrophilic center has been modified by replacing O by S in the leaving group or carbonyl center: 4-nitrophenyl acetate (1), S-4-nitrophenyl thioacetate (2), 4-nitrophenyl benzoate (3), and O-4-nitrophenyl thionobenzoate (4). The studies include O– and S– nucleophiles as well as α nucleophiles in H2O at 25.0 ± 0.1 °C. The sulfur nucleophile (4-chlorothiophenoxide, 4-ClPhS–) exhibits significant enhanced reactivity for the reactions with thiol and thione esters 2 and 4 compared with their oxygen analogues 1 and 3. On the contrary, the common nucleophile OH– is much less reactive towards 2 and 4 compared with 1 and 3. The effect of changing both the electrophilic center and the nucleofugic center on the reactivity of the other oxygen nucleophiles is not so significant: 4-chlorophenoxide (4-ClPhO–) is four to six times more reactive in the reactions with thiol and thione esters 2 and 4 compared with their oxygen analogues 1 and 3. The α effects exhibited by butan-2,3-dione monoximate (Ox–) and HOO– are strongly dependent on the nature of the electrophilic center of the substrates, indicating that the difference in the ground-state solvation energy cannot be fully responsible for the α effect. Our results clearly emphasize the strong dependence of the α effect on the substrate structure, notably, the nature of the electrophilic center. The impact of change in the nucleofuge (1→2) and the electrophilic center (3→4) on reactivity indicates that α nucleophiles will need to be “purpose built” for decontamination and nucleophilic degradation of specific biocides.Key words: α effect, nucleophilicity, nucleofuge effect, electrophilicity, polarizability.


2018 ◽  
Vol 227 (2) ◽  
pp. 135-153
Author(s):  
Dr. Naseer kareem Kazem Al Saadi

The study of the reasons for the difference of jurists in the development is an attempt to alleviate the tension caused by the difference between them, as well as being the presentation of the culture of opinion and opinion of the other, not every difference between scientists leads to the boycott and quarrel among the common people, is a sincere invitation to show that we disagree with The dispute, we want to clarify that there are natural reasons are called for the difference, such as issues follow the character of the jurist, through the nature of the language that the Koran came down, which led to differences of scholars in the extraction of the Koran


1965 ◽  
Vol 5 (17) ◽  
pp. 125 ◽  
Author(s):  
KD McLachlan

Several methods of evaluating the phosphorus status of soils for the growth of pasture plants were compared. NaHCO3 and NH4F in HCl were the most suitable extractants used. On these soils, differing widely in origin and fertilizer history, phosphorus values of 30 p.p.m, as determined by three of the methods distinguished responsive from unresponsive soils. For the other, the bicarbonate method of Olsen et al. (1954), the corresponding value was 15 p.p.m. The evidence suggests that in the soils examined, all inorganic forms of soil phosphorus, as determined by the method of Chang and Jackson (1957), contributed in some degree to the pasture plants needs. The principal source of available phosphorus, however, was the aluminium phosphates. On the other hand, the evidence suggests that the principal loss in the availability of residual phosphorus to the plant may be through its conversion to organic forms. Iron phosphates appeared to be the least available of the inorganic forms. The common ability of the four successful methods to efficiently extract phosphorus from the aluminium source appears to be the prime reason for their measuring the soil phosphorus status for plants equally well. The physical nature of aluminium phosphate, however, has a marked effect on its ability to supply the plant's phosphorus needs. A crystalline form was less available than an amorphous one. The greater availability of the amorphous forms, of both iron and aluminium phosphates, appeared to depend more upon their solubility than on their positional availability due to the greater specific surface presented. Fertilizer application enriches the aluminium phosphate content of the soils, but, in these experiments, the quantities found were related significantly to the total applications made in the previous three years only.


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