Institutes of Natural Philosophy: Theoretical and PracticalThomas & Andrews, proprietors of the work. Sold at their bookstore, no. 45, Newbury-street... J. F. Buckingham, printer., 1811 - 428 σελίδες |
Αναζήτηση στο βιβλίο
Αποτελέσματα 1 - 5 από τα 29.
Σελίδα 138
... declination or variation of the needle . PROP . X. There is generally a small variation in the direction of the magnetick needle , which differs in degree at different places and times . This is known by observing the different points ...
... declination or variation of the needle . PROP . X. There is generally a small variation in the direction of the magnetick needle , which differs in degree at different places and times . This is known by observing the different points ...
Σελίδα 139
... result of observations made by Mr. Canton at different hours of the day , and also the mean variation for each month in the year . The The Declination observed at different Hours of the same day Book IV . 139 * OF MAGNETISM .
... result of observations made by Mr. Canton at different hours of the day , and also the mean variation for each month in the year . The The Declination observed at different Hours of the same day Book IV . 139 * OF MAGNETISM .
Σελίδα 140
Theoretical and Practical William Enfield Samuel Webber. The Declination observed at different Hours of the same day . The mean Variation for each Month in the Year . JUNE 27 , 1759 . Degrees of the Hours . Min . Declin , West ...
Theoretical and Practical William Enfield Samuel Webber. The Declination observed at different Hours of the same day . The mean Variation for each Month in the Year . JUNE 27 , 1759 . Degrees of the Hours . Min . Declin , West ...
Σελίδα 252
... solstice . then the difference of the two , will be the distance between the tropicks ; the half of which will be the obliquity sought . By By the same method , the declination of the sun 252 BOOK VII . PART I. OF ASTRONOMY .
... solstice . then the difference of the two , will be the distance between the tropicks ; the half of which will be the obliquity sought . By By the same method , the declination of the sun 252 BOOK VII . PART I. OF ASTRONOMY .
Σελίδα 253
... declination of the sun . The next day , again observe the meridian altitude of the sun , and gather from thence his declination . If these two de- clinations be of different kinds , as the one south and the other north , the equinox ...
... declination of the sun . The next day , again observe the meridian altitude of the sun , and gather from thence his declination . If these two de- clinations be of different kinds , as the one south and the other north , the equinox ...
Άλλες εκδόσεις - Προβολή όλων
Institutes of Natural Philosophy, Theoretical and Practical William Enfield Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2012 |
Institutes of Natural Philosophy: Theoretical and Practical (Classic Reprint) William Enfield Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2018 |
INSTITUTES OF NATURAL PHILOSOP William 1741-1797 Enfield,Samuel 1759-1810 Webber Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2016 |
Συχνά εμφανιζόμενοι όροι και φράσεις
acquired in falling altitude angle of incidence angle of refraction apparent magnitude appear axis ball body descends body falls centre of gravity centripetal force chord circle column concave conductor consequently converge convex convex lens cycloid degrees denser direction diverge earth eclipse ecliptick elastick electrick electrified equal equator fluid focus force of gravitation given glass Hence horizon inches incident rays inclined plane inferior conjunction inferior planets inversely latitude length lens longitude magnet magnetick mean anomaly mercury meridian mirror momentum moon moon's motion object oblique optick orbit orifice parallax parallel rays parallelogram passing pendulum perpendicular Plate pole pressure Prop quantity of matter radiant radius ratio reflected refraction right ascension right line SCHOL semidiameter shewn side sine space described specifick gravity square sun's supposed surface tangent triangle tube velocity acquired vessel vibrations weight whence
Δημοφιλή αποσπάσματα
Σελίδα 326 - It is very probable that the great stratum called the milky way, is that in which the sun is placed, though perhaps not in the very centre of its thickness.
Σελίδα 208 - Every Ray of Light in its passage through any refracting Surface is put into a certain transient Constitution or State, which in the progress of the Ray returns at equal Intervals, and disposes the Ray at every return to be easily transmitted through the next refracting Surface, and between the returns to be easily reflected by it.
Σελίδα 328 - As, by the former supposition, the luminous central point must far exceed the standard of what we call a star, so, in the latter, the shining matter about the centre will be much too small to come under the same denomination; we therefore either have a central body which is not a star, or have a star which is involved in a shining fluid, of a nature totally unknown to us.
Σελίδα 326 - ... great combination with numberless others; and in order to investigate what will be the appearances from this contracted situation, let us begin with the naked eye. The stars of the first magnitude being in all probability the nearest, will furnish us with a step to begin our scale; setting off. therefore, with the distance of Sirius or Arcturus, for instance, as unity, we will at present suppose, that those of the second magnitude are at double, and those of the third at treble the distance,...
Σελίδα 162 - This amounts to the same with saying, that, in the case before us, the sine of the angle of incidence is to the sine of the angle of refraction in a given ratio.
Σελίδα 326 - ... to be the whole contents of the heavens. Allowing him now the use of a common telescope, he begins to suspect that all the milkiness of the bright path which surrounds the sphere may be owing to stars. He perceives a few clusters of them in various parts of the heavens, and finds also that there...
Σελίδα 274 - The appearance of what I have called the actual fire or eruption of a volcano, exactly resembled a small piece of burning charcoal, when it is covered by a Very thin coat of white ashes, which frequently adhere to it when it has been some time ignited ; and it had a degree of brightness, about as strong as that with which such a coal would be seen to glow in faint day-light.
Σελίδα 147 - Let a portion of a beam of light be intercepted by any body : the shadow of that body will be bounded by right lines passing from the luminous body, and meeting the lines which terminate the opaque body. 2. A ray of light, passing through a small orifice into a dark room, proceeds in a straight line. 3. Rays will not pass through a bended tube.
Σελίδα 326 - We will now retreat to our own retired station in one of the planets attending a star in the great combination with numberless others; and in order to investigate what will be the appearances from this contracted situation, let us begin with the naked eye. The stars of the first magnitude, being, in all probability, the nearest, will furnish us with a step to begin our scale ; setting off, therefore, with the distance of Sirius...
Σελίδα 231 - The Azimuth of a heavenly body, is the arc of the horizon intercepted between...