Ferguson's Lectures on Select Subjects in Mechanics, Hydrostatics, Hydraulics, Pneumatics, Optics, Geography, Astronomy and Dialing: With Notes and an Appendix Adapted to the Present State of the Arts and Sciences, Volume 2Bell & Bradfute, J. Fairbairn, 1806 - 50 pagina's |
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Ferguson's Lectures on Select Subjects,: In Mechanics ..., Volume 2 James Ferguson Volledige weergave - 1814 |
Veelvoorkomende woorden en zinsdelen
achromatic acting altitude angle of weather aperture arch axis axle brass breadth centre of gravity circle circumference concave concave lens construction convex Convex lens crown glass curvature curve cycloid cylinder declination degrees dial diameter diminished divided effect employed engine epicycloid equal extremity feet fixed flint glass float-boards focal distance focal length force force of impulsion friction gnomon Gregorian telescopes gudgeons horizontal horses hour-lines impelling power inches increase l'Acad latitude LECT lens lenses lever load machine machinery magnifying power mechanic meridian method mill millstone move Newtonian telescopes number of teeth object glass parallel perpendicular pinion piston plane Plate pounds quadrant quantity radius raised reflecting telescopes refraction roller round sails screw shew shewn sine speculum square steam stile sun's suppose surface Tang tangent telescope thrashing tion tooth trundle tube turns valve velocity vertical weight wheel wind wind-mills wiper
Populaire passages
Pagina 506 - The FABLE of the BEES ; or, PRIVATE VICES, PUBLIC BENEFITS. With an ESSAY on CHARITY and CHARITY SCHOOLS, and a Search into the NATURE of SOCIETY.
Pagina 404 - ... alternately admitting the steam to the different sides of the smaller piston, while the steam last admitted into the smaller cylinder passes alternately to the different sides of the larger piston in the larger cylinder, the top and bottom of which are made to communicate alternately with the condenser. In an engine working with the improvements which have been just described, while the steam is admitted to one side of the piston in the smaller cylinder, the steam on the other side has room made...
Pagina 404 - ... pounds the square inch entering above the smaller piston, will carry it downwards, while the steam below it, instead of being allowed to escape into the atmosphere or applied to any other purpose, will pass into the larger cylinder above its piston, which will take its downward stroke at the same time that the piston of the smaller cylinder is doing the same thing ; and while this goes on, the steam which last filled the larger cylinder, in the upward stroke of the engine, will be passing into...
Pagina 281 - ... 7. The load at a maximum that sails of a similar figure and position will overcome, at a given distance from the centre of motion, will be as the cube of the radius.
Pagina 331 - ... planes. Mr. Ferguson found that the quantity of friction was always proportional to the weight of the rubbing body, and not to the quantity of surface, and that it increased with an increase of velocity, but was not proportional to the augmentation of celerity. He found also that the friction of smooth soft wood, moving upon smooth soft wood, was equal to \ of the weight ; of rough wood upon rough wood T of the weight ; of soft wood upon hard, or hard upon soft, f ot the weight ; of polished...
Pagina 4 - If the plane (still facing the meridian) be made to incline, or recline, by any given number of degrees, the hour-circles of the sphere will still cut the edge of the plane in those points to which the hour-lines must be drawn straight from the centre j and the axis of the sphere will cast a shadow on these lines at the respective hours.
Pagina 403 - ... are to be alternately opened and shut during the working of the engine. The top of the small cylinder should have a communication with the bottom of the larger cylinder, and the bottom of the smaller one with the top of the larger, with proper means to open and shut these alternately by cocks, valves, or any other well-known contrivance.
Pagina 67 - English, the reading of which is wholly neglected, or at least read to very little purpose, without any due observations made to them of the proper accent and manner of reading; by this means they have acquired such ill habits as will not easily be removed.
Pagina 133 - Q : making the distances between the tips of the hollows, as IK, LM, NO, and PQ, each equal to the radius of the quadrants ; and leaving sufficient room within the angular points, p, q, r, and s, for the equinoctial circle in the middle.
Pagina 8 - ... upon that plane, as far from each other as is equal to the intended thickness of the gnomon or stile of the dial, and the space included between them will be the meridian or twelve o'clock line on the dial. Cross this meridian at right angles with the six o'clock line...