Ferguson's Lectures on Select Subjects, in Mechanics, Hydrostatics, Hydraulics, Pneumatics, Optics, Geography, Astronomy, and Dialling: A New Edition Corrected and Enlarged with Notes and an Appendix, Adapted to the Present State of the Arts and Sciencespublished, 1814 - Astronomy |
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Page 289
... longitude , be- cause no one of them lies either eastward or westward from any of the rest . If we imagine 24 semicircles , one of which Hour- is the geographical meridian of a given place , circles . to meet at the poles , and to ...
... longitude , be- cause no one of them lies either eastward or westward from any of the rest . If we imagine 24 semicircles , one of which Hour- is the geographical meridian of a given place , circles . to meet at the poles , and to ...
Page 296
... longitude , and at other times hour - circles . The globe is hung in a brass ring , called the brazen meridian ; and turns upon a wire in each pole sunk half its thickness into one side of the meridian ring by which means , that side of ...
... longitude , and at other times hour - circles . The globe is hung in a brass ring , called the brazen meridian ; and turns upon a wire in each pole sunk half its thickness into one side of the meridian ring by which means , that side of ...
Page 300
... longitude of any given place upon the globe . Turn the globe on its axis , until the given place comes exactly under that graduated side * The latitude of a place is its distance from the equator , and is north or south , as the place ...
... longitude of any given place upon the globe . Turn the globe on its axis , until the given place comes exactly under that graduated side * The latitude of a place is its distance from the equator , and is north or south , as the place ...
Page 301
... longitude and latitude of a place being giv en , to find that place on the globe . Look for the given longitude in the equator , ( counting it eastward or westward from the first meridian , as it is mentioned to be east or west ) and ...
... longitude and latitude of a place being giv en , to find that place on the globe . Look for the given longitude in the equator , ( counting it eastward or westward from the first meridian , as it is mentioned to be east or west ) and ...
Page 302
... longitude , and differ- ence of latitude , between any two given pla- ces . Bring each of these places to the brazen me- ridian , and see what its latitude is the lesser latitude subtracted from the greater , if both places be on the ...
... longitude , and differ- ence of latitude , between any two given pla- ces . Bring each of these places to the brazen me- ridian , and see what its latitude is the lesser latitude subtracted from the greater , if both places be on the ...
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Ferguson's Lectures on Select Subjects in Mechanics, Hydrostatics ... James Ferguson,Robert Patterson No preview available - 2013 |
Common terms and phrases
angle avoirdupois axis axle ball body bottom brass brazen meridian bucket centre of gravity centre of motion centrifugal force circle concave convex glass cornea cubic cylinder degrees diameter divided draw earth ecliptic equal equator equinoctial eye-glass fall feet fixed fluid focal distance focus force go round half heavens hole horizon hour inches inclined plane latitude length lever longitude machine mirror moon move north pole object optic nerve ounces parallel passing perpendicular height pipe piston plane PLATE polar circles pounds pressure prop proportion pulley pump quantity quicksilver raised rays receiver refracted retina right ascension rise rope screw side south pole specific gravities spring square stars sun's place suppose surface telescope tion troy Troy Weight trundle tube turn the globe turned round valve velocity vessel wedge weight wheel whole winch
Popular passages
Page 54 - ... 2. When the prop is at one end of the lever, the power at the other, and the weight between them.
Page xix - Beads upon it, at arms' length, between my eye and the stars ; sliding the Beads upon it till they hid such and such Stars from my eye, in order to take their apparent distances from one another ; and then, laying the Thread down on a Paper, I marked the Stars thereon by the Beads, according to their respective positions, having a Candle by me.
Page xxxv - ... my celestial map, in order to find the two opposite points of the ecliptic in which her orbit crosses it, I was altogether at a loss how and where in the ecliptic (in my scheme) to place these intersecting points : this was in the year 1739. At last, I recollected, that when I was with squire Grant, of...
Page xxvi - I saw the spring box, with part of the chain round it ; and asked him what it was that made the box turn round ? He told me that it was turned round by a steel spring within it. Having then never seen any other spring than that of my father's...
Page xxix - ... sometimes on one side of a plain road and sometimes on the* other, crossing the road at small angles, but never going far from either side of it.
Page xlii - Having never had a grammatical education, nor time to study the rules of just composition, I acknowledge that I was afraid to put it to the press ; and for the same cause, I ought to have the same fears still.
Page xxviii - Two large globular stones stood on the top of his gate ; on one of them I painted (with oil colours) a map of the terrestrial globe, and on the other a map of the celestial...
Page xxvi - But happening one day to see a gentleman ride by my father's house, which was close by a public road, I asked him what o'clock it then was : he looked at his watch, and told me. As he did that with so much...
Page 306 - The hour of the day at any place being given, to find what time it then is at any other place. Bring the given place to the brazen meridian, and set the index, to the given hour; then turn the globe, until...
Page 267 - ... and, consequently, it will magnify so much the more ; for the rays are not coloured by reflection from a concave mirror, if it be ground to a true figure, as they are by passing through a convex-glass, let it be ground ever so true.