Notices of the proceedings at the meetings of the members of the Royal Institution of Great Britain with abstracts of the discourses . the explosions happen to haveonly just sufficient force to blow the mass to atoms and lift thegreater part of it over the lip of the crater without distributing thewhole widely in the air. The mixture of solid particles and incan-descent gas behaves like a heavy liquid, and before the solid particleshave time to subside, the whole rolls down the side of the mountainunder the influence of gravity, and consequently gathers speed andmomentum as it goes. The heavy
Notices of the proceedings at the meetings of the members of the Royal Institution of Great Britain with abstracts of the discourses . the explosions happen to haveonly just sufficient force to blow the mass to atoms and lift thegreater part of it over the lip of the crater without distributing thewhole widely in the air. The mixture of solid particles and incan-descent gas behaves like a heavy liquid, and before the solid particleshave time to subside, the whole rolls down the side of the mountainunder the influence of gravity, and consequently gathers speed andmomentum as it goes. The heavy solid particles are graduallydeposited, and the remaining steam and gases, thus relieved of theirburden, are free to ascend. The effect of avalanches in compressing the air before them andsetting up a powerful blast, the results of which extend beyond thearea covered by the fallen material, has long been recognised. Agroup of large trees was overthrown by the blast of the great ava-lanche from the Attels on the Gemmi pass in 1895; all lay prostratein directions radiating away from the place where the avalanchecame down. [T. A.]. 1903.] Professor W. E. Balby on Vibration Problems. 235 WEEKLY EVENING MEETING,Friday, January 30, 1903. The Right Hon. Sir James Stirling, ,Vice-President, in the Chair. Professor W. E. Dalby, M. Inst. Vibration Problems in Engineering Science. Vibration Problems in Engineering Science arise from the fact thatthe different parts forming engines and machinery are always chang-ing their motion relatively to the frame, the change being in generalcontinuous and periodic. To change the motion of a body requires the action of a force, andit is the equal and opposite aspects of the accelerating forces actingon the moving parts of an engine or machine which re-acting on theframe tend to set it in motion and with it the foundations to whichit is attached. In this way vibration in the surroundings may beset up. My first object is
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