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able acting actual already amount applied arrangement attached axle balance ball beam body break bridge calculated called centre clock column consequently cord course deflection descend described direction distance easily effect efficiency employed energy equal example exerted experiment explained extremity fall force formula friction give given gravity greater half hand hence hook horizontal inch increased inertia iron knife-edges lecture length less lever load lower machine manner means measure mechanical motion move necessary observed overcome passes pendulum piece pine placed plane position pressure principle produced proportional pull pulley raised remains represented resistance rest result ring rope round screw seen shown side simple slide spring square stone strain strength sufficient suppose surface suspended Table tray turn units values velocity vibration weight wheel wood
Page 124 - An equilibrium is produced in all the levers, when the weight multiplied by its distance from the fulcrum is equal to the product of the power multiplied by its distance from the fulcrum.
Page 251 - ... others. Moreover, the extant fragment by Anthemius himself (on burning mirrors) proves the property of mirrors of parabolic section, using the properties of the parabola (a) that the tangent at any point makes equal angles with the axis and with the focal distance of the point, and (b) that the distance of any point on the curve from the focus is equal to its distance from a certain straight line (our...
Page 113 - ... 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 9 - 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 241 - 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.