Ferguson's Lectures on Select Subjects,: In Mechanics, Hydrostatics, Hydraulics, Pneumatics, Optics, Geography, Astronomy, and Dialling, Volume 2M. Carey ... : A. Small, printer, 1814 - Celestial globes |
Contents
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Common terms and phrases
ABCD altitude angle aperture arch axis axle boiler bottom brass breadth bucket centre of gravity circle circumference cock concave concave lens construction convex Convex lens curvature cycloid cylinder declination degrees diameter diminished distance divided draw edge epicycloid equal equator fall feet fixed floatboards focal length force force of impulsion friction glass gnomon Gregorian telescope gudgeon horizontal dial hour-lines impelling inches inclination latitude lens lenses lever load machine mean motion meridian mill millstone minute move Newtonian telescope number of teeth object-glass parallel perpendicular pinion pipe piston plane PLATE pound weight pounds pounds avoirdupois quadrant quantity radius raised ratchet-wheel refracting telescope refraction right lines roller rope round sails shadow side sine spindle steam stile subtract sun's suppose surface tangent telescope thickness tion tooth trundle tube turn velocity vertical water-wheel weight wheel wind wind-mills
Popular passages
Page 275 - The increase of effect, when the increase of the velocity of the wind is small, will be nearly as the squares of those velocities : 2dly. When the velocity of the wind is double, the effects will be nearly as 10 : 27-*- : JBut, 3dly.
Page 251 - This sliding bolt is not distinctly seen in the figure, but the round top of the brass stud is visible below the letter h: the iron rod that passes through the windshaft bears against this brass stud. The sliding bolt is 4 feet 9 inches long, 9 inches broad, and | of a foot thick.
Page 393 - ... 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.
Page 7 - London, which is 51 ^ degrees north, elevate the north pole of the globe 51 ^ degrees above the north point of the horizon, and then turn the globe, until the first meridian (which is that of London on the English terrestrial globe) cuts the north point of the horizon, and set the hour- index to XII at noon.
Page 8 - Because the hour-lines are less distant from each other about noon, than in any other part of the dial, it is best to have the centres of these quadrants at...
Page 286 - ... 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 -| of the >veight; of soft wood upon hard, or hard upon soft...
Page 174 - Divide .90 (the number of revolutions which a millstone 5 feet diameter should perform in a minute) by the number of revolutions made by the wheel in a minute, and the quotient will be the number of turns which the millstone ought to make for one revolution of the wheel.
Page 292 - ... force. 5. Friction is not generally increased by augmenting the rubbing surfaces. 6. Friction is not increased by an increase of velocity ; at least it is not generally so ; and, in some cases, even decreases with an increase of celerity. 7. The friction of cylinders, rolling upon a horizontal plane, is in the direct 'ratio of their weights, and in the inverse ratio of their diameters. An easy method of experimenting on the friction of surfaces, is, to place a...
Page 194 - ... whole, than low ones can be admitted to do ; for a wheel of 24 feet high may move at the rate of...
Page 66 - 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.