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 116
... vessel are as much pressed by a fluid in it , all around in any given ring of points , as the fluid below that ring is pressed by the weight of all that stands above it . Hence the pressure upon every point in the sides , immediately ...
... vessel are as much pressed by a fluid in it , all around in any given ring of points , as the fluid below that ring is pressed by the weight of all that stands above it . Hence the pressure upon every point in the sides , immediately ...
Page 118
... vessels be , if they be of equal heights , and if the areas of their bot- toms be equal , the pressures of equal heights of water are equal upon the bottoms of these yessels , even though the one should hold a PLATE 118 Of Hydrostatics .
... vessels be , if they be of equal heights , and if the areas of their bot- toms be equal , the pressures of equal heights of water are equal upon the bottoms of these yessels , even though the one should hold a PLATE 118 Of Hydrostatics .
Page 119
... vessel by a hinge D , so that it may open like the lid of a box ; and let each bottom be kept up to its vessel by equal weights E and E , hung to lines which go over the pulleys F and F , ( whose blocks are fixed to the sides of the vessels ...
... vessel by a hinge D , so that it may open like the lid of a box ; and let each bottom be kept up to its vessel by equal weights E and E , hung to lines which go over the pulleys F and F , ( whose blocks are fixed to the sides of the vessels ...
Page 120
... vessel , by the action of the co- lumn Ag , as it would be by a column of the same height , and of any diameter whatever ; ( as was evident by the experiment of the tube , Fig . 3. ) and therefore , since action and re - action are ...
... vessel , by the action of the co- lumn Ag , as it would be by a column of the same height , and of any diameter whatever ; ( as was evident by the experiment of the tube , Fig . 3. ) and therefore , since action and re - action are ...
Page 123
... vessel AB , to the depth of six inches below the sur- face of the water at K , and then , the leaden bottom EFG will be plunged to the depth of somewhat more than 11 times its own thick- wood may ness : holding the tube at that depth Of ...
... vessel AB , to the depth of six inches below the sur- face of the water at K , and then , the leaden bottom EFG will be plunged to the depth of somewhat more than 11 times its own thick- wood may ness : holding the tube at that depth Of ...
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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.