Monthly Notices of the Royal Astronomical Society, Volume 39Priestley and Weale, 1879 - Astronomy Beginning with 1978, articles on microfiche are enclosed with some issues. |
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77 Sept altitude appeared April Astronomer Royal August axis Berlin bisected bright Brussels Catalogue centre chronometers circle clock coefficients Comet comparison computed correction deduced determined diameter disk distance double stars Earth eclipse equations Equatoreal given gives Greenwich Greenwich Mean Hansen's heliometer Herschel Hyde inches instrument Internal contact July June latitude limb London longitude lunar Lyrids magnitude Mars measures Melbourne meridian meteor showers method micrometer Monthly Notices Moon Moon's Nautical Almanac nearly Niesten November observations obtained occultation orbit paper Paris period Perseid perturbations planet polar position angle Prof Professor proper motion radiant point reduced refraction remarkable right ascension Royal Astronomical Society Royal Observatory satellite Saturn seen Smyth Solar Eclipse spectroscope spectrum Stationary meteor Table telescope temperature tion Transit of Mercury Tupman ΙΟ
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Page 447 - Pliicker's tubes. An additional advantage arises from the soapstone plates, viz : the temperature of the small volume of air between the terminals is materially increased, and increased brightness results. I have tried the effect of warming the air by passing it through a coil of brass tube maintained at a bright red heat, but this does not seem to make any perceptible difference when the terminals are enclosed in the spark compressor. The optical part of my apparatus has undergone many modifications....
Page 231 - Report for 1869 (Transactions of the Sections, p. 60), and of a deep sea pressure gauge (see British Association Reports, Transactions of the Sections, 1859, p. 236, and 1860, p. 202). The object of the latter was to determine the pressure of the water at great depths in the sea by means of the compression of the water contained in the instrument, which may be regarded as a small hydraulic press, of which the ram is forced into the cylinder by the increasing pressure of the sea when sinking, and...
Page 168 - N., long. 15° E., the ice-field was found covered with a bed of freshly fallen snow 50 mm. thick, then a more compact bed 8 mm. in thickness, and below this a layer 30 mm. thick of snow converted into a crystalline granular mass. The latter was full of black granules, which became grey when dried, and exhibited the magnetic and chemical characters already...
Page 169 - Nordenskjb'ld extracted, by means of the magnet, from a large quantity of material sufficient particles to determine their metallic nature and composition. These grains separate copper from a solution of the sulphate, and exhibit conclusive indications of the presence of cobalt (not only before the blowpipe, but with...
Page 445 - Ruhmkorff coil capable of giving a spark of seventeen inches. The battery was eventually superseded by a Gramme dynamoelectric machine which can produce a current powerful enough to give, between carbon points, a light equal to 500 standard candles. When this machine is properly applied to the 17-inch induction coil, it will readily give 1,000 10-inch sparks per minute.
Page 536 - Catalogue des ouvrages d'astronomie et de météorologie qui se trouvent dans les principales bibliothèques de la Belgique...
Page 173 - Martial equator. dation of mineral substances, does not counterbalance the amount continually being added to the atmosphere from meteors, together with the supplies derived from volcanic vents and from other sources from which the atmosphere may be recruited, it will be evident that the total amount of the atmosphere must either be increasing or decreasing. And the point to which I wish to draw attention is that such an increase or decrease would in time serve to account for great changes of temperature...
Page 446 - ... primary circuit of the induction coil ; but during the past year, by carrying the rate of rotation of the Gramme up to 1,000 per minute, the strength of the current has been so much increased that the mercury was driven violently out of the cup, and hence it was essential to arrange a mechanical break in which solid metal alone was used. This has been accomplished by fastening on the axis of the Gramme bobbin a wheel with an interrupted rim, which serves the purpose well. As to the induction...
Page 451 - There is also another cause for a difference of appearance in a bright-line spectrum produced in a laboratory and bright lines in the Sun. While the edges of a band in the spark spectrum may be nebulous or shaded off, the corresponding band in the solar spectrum may have its edges sharpened by the action of adjacent dark lines due to one or another of the metallic substances in the Sun.