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 |
From inside the book
Results 1-5 of 37
Page xxviii
... heavens ; on each , the twenty - four hours were placed around the equinoctial , so as to show the time of the day when the sun shone out , by the boundary where the half of the globe at any time enlightened by the sun was parted from ...
... heavens ; on each , the twenty - four hours were placed around the equinoctial , so as to show the time of the day when the sun shone out , by the boundary where the half of the globe at any time enlightened by the sun was parted from ...
Page xxix
... heavens , I was so im- pressed as sometimes to imagine I saw the ecliptic in the heavens , among the stars , like a broad circular road for the sun's apparent course ; and fancied the paths of the planets to resemble the narrow ruts ...
... heavens , I was so im- pressed as sometimes to imagine I saw the ecliptic in the heavens , among the stars , like a broad circular road for the sun's apparent course ; and fancied the paths of the planets to resemble the narrow ruts ...
Page xli
... heavens , I found it to be really so . I then made a simple machine for delineating both her path and the earth's , on long paper laid on the floor . " I carried the machine and delineation to the late Martin Folkes , Esq . President of ...
... heavens , I found it to be really so . I then made a simple machine for delineating both her path and the earth's , on long paper laid on the floor . " I carried the machine and delineation to the late Martin Folkes , Esq . President of ...
Page 26
... heavenly bodies . If the body A be projected along the straight line AFH in open space , where it meets with no resistance , and is not drawn aside by any power , it will go on for ever with the same velocity , and in the same direction ...
... heavenly bodies . If the body A be projected along the straight line AFH in open space , where it meets with no resistance , and is not drawn aside by any power , it will go on for ever with the same velocity , and in the same direction ...
Page 41
... heavens to go round ever so large a sun in the centre of its orbit , its centrifugal force would soon carry off both itself and the sun . For , the greatest body placed in any part of free space might be easily moved ; because , if ...
... heavens to go round ever so large a sun in the centre of its orbit , its centrifugal force would soon carry off both itself and the sun . For , the greatest body placed in any part of free space might be easily moved ; because , if ...
Other editions - View all
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.