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Abstract
Vibration is considered to include the oscillatory motion of travelling vehicles. The predominant, linear sinusoidal component of this motion is usually in the vertical direction and of 0-50 e.p.a. in frequency. A human being or animal subjected to vibration may exhibit a variety of symptoms and anatomical damage. These effects may be diminished by shielding the operator from the vibration of the vehicle. Excessive shielding is undesirable in that it increases the relative motion of the operator with respect to the vehicle and hence may be expected to cause decrement of performance. Some of the physical theory necessary for the design of vibration shielding equipment is given. Methods for human vibration protection are described and reference is made to a currently available device