Now showing items 32-51 of 115

    • Harmonic Curves 

      Rigge, William F., S.J. (Creighton University. Omaha, Nebraska, 1926)
      Harmonic curves always captivate the eye by their wonderful beauty and their endless variety. They have that correct proportion in their parts which delights the artist, that simplicity of construction in their apparent ...
    • A Heliostat for the Lecture Room 

      Rigge, William F., S.J. (1913)
      First Paragraph: | A heliostat, that will hold a beam of sunlight as steady as if it came from a stereopticon fed by a self-focusing arc-lamp, is looked upon by the majority of professors of physics as ideal but quite ...
    • An Historical Examination of the Connection of Calixtus III With Halley’s Comet 

      Rigge, William F., S.J. (1910)
      First Paragraph: | There has just appeared from the Vatican Press a large-sized pamphlet of forty pages, which deserves to be regarded as the final word concerning the connection between Calixtus III and Halley’s comet. ...
    • Identification of Wires in a Cable 

      Rigge, William F., S.J. (1926)
      First Paragraph: | For telephone men and others who are accustomed to handle cables with hundreds of wires in them, their identification is mere child’s play, as it is done by the color or character of its insulation, its ...
    • Is Mars Inhabited? 

      Rigge, William F., S.J. (1909)
      First Paragraph: | The question as to whether the planet Mars is actually inhabited by a race of intelligent beings is frequently brought to our notice by the press. It is a most interesting question, not only in itself, ...
    • Is Newton’s Theory of Gravity All Wrong 

      Rigge, William F., S.J. (1919)
      First Paragraph: | In these days of unrest, when the alignment of nations, no less than their own internal machinery, is so seriously threatened with disarrangement that the established order of thousands of years runs ...
    • Is the Earth Falling into the Sun 

      Rigge, William F., S.J. (1911)
      First Paragraph: | It has often been said that no astronomer can be an atheist. The scale upon which the universe is built; the endless variety and the infinite number of the visible stars, all of which are self-luminous ...
    • Jesuit Astronomy 

      Rigge, William F., S.J.; Schreiber, John, S.J. (1904)
      First Paragraph: | Part I. The Old Society, 1540-1773 | In the following pages I have attempted to jot down a few notes concerning the Jesuits of the 17th and 18th centuries and their relation to astronomy: I say notes, ...
    • The Lunar Saros 

      Rigge, William F., S.J. (1918)
      First Paragraph: | In speaking of the Saros, that period of 18 years 10 or 11 days (according as 5 or 4 leap years intervene) 7 hours and 42 minutes, after which eclipses repeat themselves in the same order and with very ...
    • Mathematics and Its Power to Train the Mind 

      Rigge, William F., S.J. (1910)
      First Paragraph: | The very important place that mathematics occupies in education is sufficiently evinced by the fact that it has always been judged to be an essential branch in the curriculum of every school of learning ...
    • The North Pole Part 1 

      Rigge, William F., S.J. (1913)
      First Paragraph | The poles of the earth are, in the mathematical as well as in the ordinary sense of the word, singular points; that is to say, they possess many essential features which do not apply in any way to other ...
    • The North Pole Part 2 

      Rigge, William F., S.J. (1914)
      First Paragraph | The axis of revolution about which the earth revolves is not fixed in the earth, as one would naturally suppose, and as even scientific men supposed until the contrary was proved. It moves about in a very ...
    • The Observatory 

      Rigge, William F., S.J. (1911)
      First Paragraph: | The many important improvements recently made in the Observatory are the cause of the present article. In mentioning these improvements, the opportunity is taken to speak of the nature of the Observatory, ...
    • The Omaha Tornado 

      Rigge, William F., S.J. (1913)
      First Paragraph: | The city papers have given so much information in words and in pictures concerning the destructive tornado that visited Omaha on Easter Sunday, March 23rd, that it would be needless even to recapitulate ...
    • The Opposition of Mars in 1909 

      Rigge, William F., S.J. (1909)
      First Paragraph: | Of all the heavenly bodies that adorn the starry sky there is none that a- rouses greater interest than the planet Mars. Mars is another earth, another abode, it is believed by many, of intelligent beings ...
    • Partial Eclipse of the Moon, January 29, 1907 

      Rigge, William F., S.J. (1907)
      First Paragraph: | There will be a partial eclipse of the moon on the morning of January 29, 1907. Less than three- fourths (71 per cent.) of the moon’s diameter will be obscured.
    • A Perpetual Calendar in a Nutshell 

      Rigge, William F., S.J. (1901)
      First Paragraph: | Those of our readers who are interested in calendars will find the annexed little table very serviceable. This table gives within a small space the Dominical letter for every day of the year. As these ...
    • The Polar Star 

      Rigge, William F., S.J. (1912)
      First Paragraph: | In the popular mind no star is more deserving of the appellation “fixed” than the polar star. We are told that the sailor steers his ship, and the explorer finds his way, by the aid of this celestial ...
    • Polar Triangles 

      Rigge, William F., S.J. (1906)
      First Paragraph: | Polar triangles are apt to prove most uninteresting to the student of spherical geometry. The cause of this apathy is to be found as well in the want of a globe upon which these triangles may be shown ...
    • Problems in Divided Circuits 

      Rigge, William F., S.J. (1926)
      First Paragraph: | Ten years ago the wire chief of the Western Union Telegraph Company in Omaha asked the writer to solve the following problem: | “A current of 44 milliamperes comes over a telegraph line and is connected ...