FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W4249384920> ?p ?o ?g. }

• W4249384920 endingPage "48" @default.
• W4249384920 startingPage "47" @default.
• W4249384920 abstract "LONDON. Physical Society, October 27.—Prof. J. H. Poynting, F.R.S., president, in the chair.—The theory of phase-meters: Dr. W. E. Sumpner. The author shows in the paper that the theory of the instruments is the same whether they contain iron or not, and however the coils may be arranged; that they can be calibrated by direct-current methods, although for use on alternating-current circuits; and that a new type of instrument, containing iron, conforms to the theory given. The main results of the investigation are:—(1) Phasemeters for multi-phase circuits are all equally accurate on balanced loads provided they have been correctly calibrated and possess no faults due to purely mechanical causes. Their accuracy is not affected by variations in wave-form or in current-frequency. (2) Phasemeters can be simply and accurately calibrated for balanced loads by means of a direct-current method of test. (3) The error of phasemeters on unbalanced circuits is generally serious for loads which are badly out of balance. The error, like that of a wattmeter, increases rapidly as the power-factor of the load diminishes. It can only be reduced at the expense of complication in the instrument, by increasing the number of coils used in the fixed and moving systems, and by arranging the coils and magnetic circuits to be symmetrical in regard to one another.—Apparatus designed for measuring the coronal radiation during an eclipse: Prof. H. L. Callendar. A preliminary test of the apparatus with the thermopile directly exposed to radiation of known intensity showed a deflection of nearly 25 cm. for one-thousandth of a calorie per sq. cm. per min., so that radiation one-millionth of full sunshine could be detected with certainty without using a mirror. When placed in the focus of the telescope used, radiation one thousand times smaller than this could be observed, so that even if the intrinsic heat-radiating power of the corona were only one ten-millionth of the solar surface it could still be measured to within 1 per cent. The essential point in the observations was to eliminate the variable effects of atmospheric radiation, for which a differential method of observation with the two halves of the pile was particularly suitable. In taking observations on the corona, the motion of the moon during totality was made use of to define the exact area of the corona corresponding to the differential reading. At the commencement of totality, the thermopile being centred on the sun, the inner corona on the eastern limb would be fully exposed, while on the western it would be partly covered by the moon. At the end of totality the reverse would be the case. The difference of the readings would correspond to the radiation of the strip of the inner corona uncovered by the motion of the moon between the two readings. The area of the strip of corona considered could be accurately determined from the times at which the readings were taken." @default.
• W4249384920 created "2022-05-12" @default.
• W4249384920 date "1905-11-01" @default.
• W4249384920 modified "2023-09-27" @default.
• W4249384920 title "Societies and Academies" @default.
• W4249384920 doi "https://doi.org/10.1038/073047a0" @default.
• W4249384920 hasPublicationYear "1905" @default.
• W4249384920 type Work @default.
• W4249384920 citedByCount "0" @default.
• W4249384920 crossrefType "journal-article" @default.
• W4249384920 hasBestOaLocation W42493849201 @default.
• W4249384920 hasConcept C115260700 @default.
• W4249384920 hasConcept C119599485 @default.
• W4249384920 hasConcept C121332964 @default.
• W4249384920 hasConcept C127413603 @default.
• W4249384920 hasConcept C134146338 @default.
• W4249384920 hasConcept C148043351 @default.
• W4249384920 hasConcept C163258240 @default.
• W4249384920 hasConcept C193614536 @default.
• W4249384920 hasConcept C41008148 @default.
• W4249384920 hasConcept C44280652 @default.
• W4249384920 hasConcept C62520636 @default.
• W4249384920 hasConceptScore W4249384920C115260700 @default.
• W4249384920 hasConceptScore W4249384920C119599485 @default.
• W4249384920 hasConceptScore W4249384920C121332964 @default.
• W4249384920 hasConceptScore W4249384920C127413603 @default.
• W4249384920 hasConceptScore W4249384920C134146338 @default.
• W4249384920 hasConceptScore W4249384920C148043351 @default.
• W4249384920 hasConceptScore W4249384920C163258240 @default.
• W4249384920 hasConceptScore W4249384920C193614536 @default.
• W4249384920 hasConceptScore W4249384920C41008148 @default.
• W4249384920 hasConceptScore W4249384920C44280652 @default.
• W4249384920 hasConceptScore W4249384920C62520636 @default.
• W4249384920 hasIssue "1880" @default.
• W4249384920 hasLocation W42493849201 @default.
• W4249384920 hasOpenAccess W4249384920 @default.
• W4249384920 hasPrimaryLocation W42493849201 @default.
• W4249384920 hasRelatedWork W1953516118 @default.
• W4249384920 hasRelatedWork W1967424901 @default.
• W4249384920 hasRelatedWork W1971887168 @default.
• W4249384920 hasRelatedWork W1992404955 @default.
• W4249384920 hasRelatedWork W2137530077 @default.
• W4249384920 hasRelatedWork W2381263391 @default.
• W4249384920 hasRelatedWork W2748952813 @default.
• W4249384920 hasRelatedWork W2899084033 @default.
• W4249384920 hasRelatedWork W3100115744 @default.
• W4249384920 hasRelatedWork W3102895135 @default.
• W4249384920 hasVolume "73" @default.
• W4249384920 isParatext "false" @default.
• W4249384920 isRetracted "false" @default.
• W4249384920 workType "article" @default.