Experimental Mechanics: A Course of Lectures : Delivered at the Royal College of Science for Ireland |
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amount angle of friction apparatus applied ascertain attached axis ball beam body bridge calculated values cast iron centre of gravity centrifugal force chain circumference clamped clock column cord cycloid deflection descend diameter distance effect ellipse employed energy equal equilibrium exerted fibres foot-pounds force acting formula friction fulcrum groove hence hook horizontal inch isochronous knife-edges lecture length lever machine means mechanical efficiency mechanical powers motion move moveable pulley necessary Number of Experiment oscillation overcome parallel forces parallelogram parallelogram of force particle piece pine pinion placed plane position power in lbs pressure principle produced pull pulley-block raise the load resistance result ring rope screw shown in Fig side simple pendulum slide spring balance stone weight strain strength strut sufficient suppose surface suspended Table tray velocity ratio vertical vibration wheel and axle wire wood wrought iron
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Page vii - The author's aim has been to create in the mind of the student physical ideas corresponding to theoretical laws, and thus to produce a work which may be regarded either as a supplement or an introduction to manuals of theoretic mechanics. To realize this design, the copious use of experimental illustrations was necessary. The apparatus used in the Lectures, and figured in the volume, has been principally built up from Professor Willis's most admirable system.
Page viii - Mechanics are too well known to admit of novelty, but it is believed that the mode of treatment which is adopted is more or less original. This is especially the case in the Lectures relating to friction, to the mechanical powers, to the strength of timber and structures, to the laws of motion, and to the pendulum. The illustrations, drawn from the apparatus, are nearly all original, and are beautifully executed.
Page v - Ball (RS, AM) — EXPERIMENTAL MECHANICS. A Course of Lectures delivered at the Royal College of Science for Ireland. By ROBERT STAWELL BALL, AM, Professor of Applied Mathematics and Mechanics in the Royal College of Science for Ireland (Science and Art Department). Royal 8vo.
Page vii - Arranged to meet the requirements of the Syllabus of the Science and Art Department of the Committee of Council on Education, South Kensington.
Page 11 - Theorem. Parallelogram of Forces. If two forces, acting at a point, be represented in magnitude and direction by the two sides of a parallelogram drawn from one of its angular points, their resultant is represented both in magnitude and direction by the diagonal of the parallelogram passing through that angular point.
Page 245 - Galileo's suppositions that small vibrations of the pendulum are isochronous, and that the space traversed by a falling body is proportional to the square of the time it has been falling.
Page 301 - ... that the distance from the point of suspension to the centre of the ball is the length of the pendulum ; show that the error is less than the 0-001 of an inch.
Page 115 - ... them. The upper block P is furnished with a hook for attachment to a support. The sheave it contains resembles two sheaves, one a little smaller than the other, fastened together ; they are in fact one piece. The grooves are furnished with ridges which prevent the chain from slipping around them. The v lower pulley Q consists of one sheave /which is also furnished with a groove, it carries a hook to which the load is attached. The endless chain performs a part that will be understood by the arrow...
Page 120 - OVERHAULING" OF A MECHANICAL POWER. BY J. BUHKITT WEBB, HOBOKEN, NI (Member of the Society.) IN Professor Ball's "Experimental Mechanics," page 118, the following statement is made: ''The principle which we have here established* extends to other mechanical powers, and may he stated generally. Whenever rather more than half of the applied energy is uselessly consumed by friction, the load will remain suspended without overhauling.
Page 62 - ... water, and oil, into a common tumbler. The mercury will come to rest at the bottom, the oil at the top, the upper surfaces of all being level. The same conclusion follows from the consideration, that these fluids when mixed constitute a heavy system, which, we have seen, can only come to a state of stable equilibrium when its centre of gravity is at the lowest point, a condition only fulfilled by the arrangement, in respect to density, just described. 516 tact, counteract the buoyant action of...