Discussion on Papers 1–4

MR O'NEILL (Paper 4): My paper is intended mainly for engineers rather than for seismologists, but I hope that it will be of interest to the latter and perhaps plant the seed of a new idea in their minds.

Although my paper is taken as read, I would draw your attention to the seven reasons for measuring engineering vibration which I have suggested. These are the most common reasons for vibration recording which may be either short term analytical recording, or long term monitoring of one or more parameters.

Sophisticated instrumentation may be used to record vibration for later detailed analysis, but very often field instruments are required which will yield a vibrogram for immediate assessment on site. In order to illustrate the uses of such instrumentation I will present some case histories.