The Kinematics of Machinery: Outlines of a Theory of MachinesMacmillan, 1876 - 622 σελίδες |
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Άλλες εκδόσεις - Προβολή όλων
Συχνά εμφανιζόμενοι όροι και φράσεις
already angle application arrangement auxiliary centroids axes axis axoids become block bodies Cardanic circles chain-closure chamber circular arcs closed pair closure coincides common complete conic connected considered constrained construction cord corresponding coupler crank crank mechanisms cross-block curve curve-triangle cylinder dead points describing point direction duangle employed engine epicycloids equal examination field of turning fixed link force force-closure formula further geometrical gives higher pairs instantaneous centre intersection kinematic chain kinematic pair latter M₁ machine means mechanism method moving normal obtained occurs pair-closure pairs of elements parallel paths piston Plate point-paths points of restraint portion position possible pressure-organs prevent prism profiles pulley pump quadric radii radius relative motion rhombus rolling rotation roulettes ruled surfaces screw shaft shown in Fig shows sides simple slider sliding solid of revolution spindle spur-gearing spur-wheels steam-engine straight line surfaces symbols tangents teeth triangle wheel whole
Δημοφιλή αποσπάσματα
Σελίδα 599 - Indians with their most peculiar and valued ornament — a cylindrical, opaque, white stone, looking like marble, but which is really quartz imperfectly crystallized. These stones are from four to eight inches long, and about an inch in diameter. They are ground round, and flat at the ends, a work of great labour, and are each pierced with a hole at one end.
Σελίδα 35 - A machine is a combination of resistant bodies so arranged that by their means the mechanical forces of nature can be compelled to do work accompanied by certain determinate motions.
Σελίδα 9 - In earlier times men considered every machine as a separate whole, consisting of parts peculiar to it; they missed entirely or saw but seldom the separate groups of parts which we call mechanisms. A mill was a mill, a stamp a stamp and nothing else, and thus we find the older books describing each machine separately from beginning to end. So for example Ramelli (1588) in speaking of various pumps driven by water-wheels describes each afresh from the wheel, or even the water driving it, to the delivery...
Σελίδα 604 - Powers, are certain simple instruments, commonly employed for raising greater weights, or overcoming greater resistances, than could be effected by the natural strength without them. These are usually accounted six in number, viz. the Lever, the Wheel and Axle, the Pulley, the Inclined Plane, the Wedge, and the Screw.
Σελίδα 5 - I have got a glimpse of a method of causing a pistonrod to move up and down perpendicularly by only fixing it to a piece of iron upon the beam, without chains or perpendicular guides or untowardly friction, arch heads, or other pieces of clumsiness ; by which contrivance it answers fully to expectation.
Σελίδα 5 - About 5 feet in the height of the house may be saved in 8-feet strokes, which I look upon as a capital saving, and it will answer for double engines as well as for single ones. I have only tried it in a slight model yet, so cannot build upon it, though I think it a • very probable thing to succeed. It is one of the most ingenious, simple pieces of mechanism I have ever contrived, but I beg nothing may be said on it till I specify.
Σελίδα 599 - Tushaina wears as the symbol of his authority, for it is generally of the largest size and is worn transversely across the breast, for which purpose the hole is bored lengthwise from one end to the other, an operation which, I was informed, sometimes occupied two lives.3 Stevens and Lubbock refer to this.4 Prof.
Σελίδα 599 - ... it around the neck. It appears almost incredible that they should make this hole in so hard a substance without any iron instrument for the purpose. What they are said to use is the pointed flexible leaf shoot of the...
Σελίδα 587 - A machine may be defined either from a statical or from a kinematical point of view. Regarded statically, it is any instrument by means of which we may change the direction, magnitude, and point of application of a given force ; and regarded kinematically, it is any instrument by means of which we may change the direction and velocity of a given motion.
Σελίδα 45 - ... by single pairs by combination. With different methods of combination different results are obtained, but in every case there results only one pair. Accordingly, the reciprocal combination of the elements of two pairs gives us again a pair of elements, which may differ from either of the single pairs of which it is composed.
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