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already angle angular application arrangement axes axis axoids become block bodies Cardanic circles chain-closure chamber chamber-crank chamber-wheel circular arcs closed pair closure common complete conic connected considered construction corresponding coupler crank crank mechanisms cross-block curve cylinder dead points describing point direction duangle employed engine epicycloids epitrochoid equal examination field of turning fixed link force force-closure gear gives higher pairing infinitely instantaneous centre intersection kinematic chain kinematic pair latter machine means mechanism method moving normal obtained occurs pair-closure pairs of elements parallel paths piece piston Plate point-paths points of restraint portion position possible pressure-organ prevent prism profiles pulley pump quadric radii radius relative motion revolution rhombus rolling rotary rotation roulettes ruled surfaces screw shaft shown in Fig shows sides similar simple slider sliding spindle spur-gearing spur-wheels steam steam-engine straight line surfaces swinging tangents teeth train triangle wheel whole
Seite 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.
Seite 5 - 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, and one of the most ingenious simple pieces of mechanism I have contrived, but I beg nothing may be said on it till I specify.
Seite 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...
Seite 11 - (The science of mechanisms) must therefore not define a machine, as has usually been done, as an instrument by the help of which the direction and intensity of a given force can be altered, but as an instrument by the help of which the direction and velocity of a given motion can be altered.
Seite 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.
Seite 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.
Seite 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.
Seite 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...
Seite 47 - Such a kinematic chain is called a constrained closed (or simply a closed) chain. In itself a closed chain does not postulate any definite absolute motion. In order to obtain this, a similar method must be adopted to the one employed above with pairs of elements: namely, to hold fast or fix in position one link of the chain relatively to the portion of surrounding space assumed to be stationary. The relative motions of the links then become absolute. Л closed kinematic chain of which one link is...