The inertia of the table is as thoroughly destroyed by the amount of force thus brought to bear upon it, as if a more intense force had acted momentarily. The period of suspense which occurs previous to the first movement taking place, is that during which the force communicated by the hand is equally diffused through the table, and the moment this happens, as no body can be set in motion until the motion has been imparted to every integral particle of that body, a slight additional force will be sufficient to overcome the resistence of surrounding media, and cause it to change its position. Hence a comparatively slight force exercised over a long period will not unfrequently induce effects equal to those caused by a greater degree of force exercised during a short period of time.
We often witness the practical application of this principle. If we observe two men endeavouring to move a railway carriage upon the line, we shall notice that they do not at the first exert all their strength in one powerful, and what would probably prove exhaustive and futile, effort, but placing their backs against the carriage, they will push with a continuous and gradually increasing effort for several seconds, or even longer, when a slight movement will be perceived in the carriage, and a slight additional exercise of force will set it in motion. So also, as we have seen in quarries, when several men have endeavoured to move a large mass of stone with a lever, they have not used one long and powerful effort, but a succession of slighter ones, until a tremulous motion has been seen in the mass, when by one exertion of force they have hurled it from its place.
The degree of pressure exercised by any given persons will be in the inverse ratio of the degree of control which they can exercise over the muscular system, and over their ideas; hence the phenomena of table-turning and table-talking are most fully developed by those who are possessed of but a low degree of volitional power, and in whom the passions and emotions are paramount, as in young females, boys, or those who are influenced by certain dominant ideas: and as these conditions vary in different persons to an almost endless extent, it would follow that the power of exciting the movements of the table and responses, as well as the nature and degree of the responses, would vary in a similar degree, which is found to be the case; and the rule of response is, as one of the supporters of the Satanic theory (the Rev. N. S. Godfrey) very naïvely remarks, "whatever the investigator wishes it to be."
The directive force in the phenomena of table-moving is derived from certain habitual actions of the muscles, as in the direction from right to left, from the customary use of the right hand; and the influence which our ideas exercise upon the muscular system, unwittingly and involuntarily on our part.
This, as well as the preceding remarks, are all capable of being experimentally illustrated and demonstrated; and Professor Faraday,[57] by a rigorous series of experiments, has shown that it is upon these principles that the phenomena depend.
By the use of a most ingenious and simple piece of mechanism connected with an index, he showed the extent to which we exercise a certain degree of force and directive power unconsciously, and the nature of this directive power; and the result was:—
"That when the parties saw the index it remained very steady; when it was hidden from them, or they looked away from it, it wavered about, though they believed that they always pressed directly downwards; and when the table did not move, there was still a resultant hand-force in the direction in which it was wished the table should move, which, however, was exercised quite unwittingly by the party operating. This resultant it is which, in the course of the waiting-time, while the fingers and hands become stiff, numb, and insensible by continued pressure, grows up to an amount sufficient to move the table or the substances pressed upon. But the most valuable effect of this test-apparatus is the corrective power it possesses over the mind of the table-turner. As soon as the index is placed before the most earnest, and they perceive—as in my presence they have always done—that it tells truly whether they are pressing downwards only or obliquely, then all effects of table-turning cease, even though the parties persevere, earnestly desiring motion, till they become weary and worn-out. No prompting or checking of the hand is heeded; the power is gone; and this only because the parties are made conscious of what they are really doing mechanically, and so are unable unwittingly to deceive themselves."
An experiment is familiar to many persons by which a ring, being suspended by means of a piece of thread to one of the fingers, may be caused to beat responses against a glass surface (as that of a tumbler), in answer to certain queries put audibly; or, if the ring be held by the questioner, it is requisite merely that the questions be conceived mentally. This, to many, a puzzling phenomenon is dependent upon precisely the same cause as "table-talking"—a movement caused by muscular action developed unconsciously under the influence of certain ideational states of the mind.
It is an interesting fact, that a species of divination is mentioned by Ammianus Marcellinus, in which a ring, used after the above fashion, and a table, consecrated by mystic rites, were used. We are indebted to the Rev. J. W. Thomas, of Dewsbury, for the following quotation from the works of this author, who lived about the middle of the fourth century. The quotation is taken from the first chapter of the twenty-ninth book ("Construximus, magnifici judices, ad cortinæ similitudinem Delphicæ," &c.):—