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 xliv
... pounds a year , which is regularly paid , with- out any deduction . TO the preceding account of Mr. Fergu- son's life , it may be proper to add , that he was elected a member of the Royal Society of Lon- don , without paying the usual ...
... pounds a year , which is regularly paid , with- out any deduction . TO the preceding account of Mr. Fergu- son's life , it may be proper to add , that he was elected a member of the Royal Society of Lon- don , without paying the usual ...
Page 3
... pound of silver be melted with a single grain of gold , the gold will be equally diffused through the whole silver ; so that taking one grain from any part of the mass ( in which there • can be no more than the 5760th part of a Of the ...
... pound of silver be melted with a single grain of gold , the gold will be equally diffused through the whole silver ; so that taking one grain from any part of the mass ( in which there • can be no more than the 5760th part of a Of the ...
Page 8
... pounds , and the surfaces completely polished . When the blocks of brass are small , the one will raise the other , even when a fibre of silk is placed be- tween their surfaces . - E . ED . li . * When two variable or changeable ...
... pounds , and the surfaces completely polished . When the blocks of brass are small , the one will raise the other , even when a fibre of silk is placed be- tween their surfaces . - E . ED . li . * When two variable or changeable ...
Page 11
... pounds weight , with the same degree of swiftness that a bullet of ten pounds would require . Hence it is evident , that the power or force of gravity is always proportional to the quantity of matter in bodies , whatever their bulks or ...
... pounds weight , with the same degree of swiftness that a bullet of ten pounds would require . Hence it is evident , that the power or force of gravity is always proportional to the quantity of matter in bodies , whatever their bulks or ...
Page 41
... pounds , until the end of the groove at e strikes against the pin c , and so prevents the demi - globe A from going any farther ; otherwise , the centrifugal force of B would have been great enough to have carried A quite off the ...
... pounds , until the end of the groove at e strikes against the pin c , and so prevents the demi - globe A from going any farther ; otherwise , the centrifugal force of B would have been great enough to have carried A quite off 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.