INTERNAL BODY MOVEMENTS RESULTING FROM EXTERNALLY APPLIED SINUSOIDAL FORCES

摘要: Abstract : An x-ray device designed to permit the observation of movement internal structures in animal body subjected sinusoidal oscillations is described. From x-rays taken by this device, it has been possible determine resonance frequency and phase shift regions within abdomen thorax set motion external oscillatory forces. The results observations made on anesthetized dogs show that visceral content appears oscillate as a mass having resonant 3 5 cycles per second with damping one-fifth one-quarter critical value.