It is difficult to reconcile the statement he has here made, with the declaration on the title page, of his inventions having been “tried and perfected.” In this single instance, he leaves the reader to “Be pleased to judge the consequence.”
Dr. Desaguliers, in a memoir, published by the Royal Society, vol. 31, 1720–21, quoting the foregoing article, ventures the reply: “Now the consequence of this, and such like machines [assuming them to be as above described,] is nothing less than a perpetual motion.” Of course he does not admit even the possibility of such an arrangements of parts, he only allows that if that could be executed, the other would follow. But Desaguliers admitted too much, for it may easily be demonstrated that the conditions stated may be mechanically produced, without any resulting motion. Let the annexed diagram represent a wheel of 14 feet in diameter, having 40 spokes, seven feet each, and with an inner rim coinciding with the periphery, at one foot distance, all round. Next provide 40 balls or weights, hanging in the centre of cords or chains two feet long. Now fasten one end of this cord at the top of the centre spoke C, and the other end of the cord to the next right hand spoke one foot below the upper end, or on the inner ring; proceed in like manner with every other spoke in succession; and it will be found, that, at A, the cord will have the position shown outside the wheel; while at B, C, and D, it will also take the respective positions, as shown on the outside. The result in this case will be, that, all the weights on the side A, C, D, hang to the great, or outer circle, while on the side B, C, D, all the weights are suspended from the lesser or inner circle. And if we reverse the motion of the wheel, turning it from the right hand to the left hand, we shall reverse these positions also, (the lower end of the cord sliding in a groove towards a left hand spoke) but without the wheel having any tendency to move of itself.
His notice of this exhibition was not written by the Marquis until 1655, from 14 to 17 years after its occurrence, and he may have then hesitated to say that it was not a success; but he may have persuaded himself that he was at last in possession of the secret that was at first wanting. Besides, we are not to infer that the company described as being present had gone to the Tower purposely to see the Marquis’s wheel; it being far more probable that, Charles the First and the foreign ambassadors were there to view that fortress with all its treasures and curiosities.
According to the state of knowledge in 1663, the Marquis of Worcester was not singular in entertaining this subject, and all we can make of the present article is, that he has left it open to doubt whether he himself did not consider that his experiment required confirmation. “Perpetuum Mobile; or a history of the search for self-motive power,” 1862, is a work which may be taken as an elaborate note on this article, for it was the perusal of it that led the author, to commence the compilation of that work, more than thirty years ago.
Before the publication of the “Century” Samuel Hartlib had, (on the 10th of August, 1658,) written to Mr. Boyle on the subject of a perpetual motion invented by the ingenious and celebrated John Joachim Becher, an account of which was to be printed at Frankfort.—Boyle’s Works, fol. 1744, p. 280.
Charles the Second was favoured with the exhibition of another scheme of this sort, by John Evelyn, a Fellow of the Royal Society at the time, and therefore not likely to participate in any matter which the scientific world of his day repudiated. But learned men of his time rather approved of all wonder-working automata than otherwise. Evelyn says in his Diary, under the date of 14th July, 1668, that during an interview with the King:—“I showed his Majesty the perpetual motion sent to me by Dr. Stokes from Cologne.”—Vol. ii. p. 37, ed. 1859.
An ebbing and flowing Water-work in two Vessels, into either of which the water standing at a level, if a Globe be cast in, instead of rising it presently ebbeth, and so remaineth untill a like Globe be cast into the other Vessel, which the water is no sooner sensible of, but[9] that[1] Vessel presently ebbeth, and the other floweth, and so continueth ebbing and flowing untill one or both of[2] the Globes be taken out, working some little effect besides its own motion, without the help of any man within sight or hearing: But if either of the Globes be taken out with ever so swift or easie a motion, at[3] the very instant the ebbing and flowing ceaseth; for if during the[4] ebbing you take out the Globe, the water of that Vessel presently returneth to flow, and never ebbeth after, until[5] the Globe be returned into it, and then the motion beginneth as before.
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