Publisher's Synopsis
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1744 edition. Excerpt: ... Explosion, whether greater or less, A is always shot towards O twice as far as Annotat. B (when L M N L is added to it) is shot towards P. Lect. VI. There is no calling in question, that the Pressure made by the Gunpowder, sives equal Momenta to unequal Quantities of Matter, by giving them Velocities reciprocally proportionable to those Quantities of Matter: neither is there any doubt (in favour of the new Opinion) that Pits made in Clay by the Bodies driven by the Gunpowder (supposing the Clay fix'd at A and B, Fig. I.) will be to one another as i to 2, when the Bodies are as 2 to 1; 2 with half the Velocity making only a Pit as 1, when 1 with the double Velocity will make a Pit, as 2. This shews, that the Force may be double or half, when produc'd by a Body with the fame Momentum, when the Velocity differs. As lam now convinc'd that all the Phaenomenaof the Congress of Bodies may be equally folv'd according to the Principles of the Defenders of the new, as well as those of the old Opinion, I shall here give an Example of four Experiments, where all their Phaenomena will be folv'd both ways. Experiment III. Plaley. Fig. 5. Suspend two equal Clay Balls (for example, weighing two Ounces each) by Strings from the fame Height on the Machine for trying the Congress of Bodies. Then let the Body A be r*is'd up from the lowest Point, so as to let it fall towards C with fix Degrees of Velocity, to overtake the Body B falling the fame way with two Degrees of Velocity; and the Stroke being made at the Bottom, they will both go on together with four Degrees of Velocity, as may be observ'd by their going up to Number 4. Now here before the Stroke, the Momentum of A being 12, and the Momentum of B being four, the >um of the Momenta towards..."