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book_n	word_n	writer_n	year_n	236	4	4.2777	3	false

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ID	Title	Author	Corrected Date of Publication (TCP Date of Publication)	STC	Words	Pages
A29057	Tracts written by the Honourable Robert Boyle containing New experiments, touching the relation betwixt flame and air, and about explosions, an hydrostatical discourse occasion'd by some objections of Dr. Henry More against some explications of new experiments made by the author of these tracts : to which is annex't, An hydrostatical letter, dilucidating an experiment about a way of weighing water in water, new experiments, of the positive or relative levity of bodies under water, of the air's spring on bodies under water, about the differing pressure of heavy solids and fluids.; Selections. 1672	Boyle, Robert, 1627-1691.	1672 (1672)	Wing B4060; ESTC R10383	110,756	442

weight of the Lead B 'T is impossible they can counterpoise both seeing the Water is now 12 and B 18. It must then either be the counterballance of the Water or the counterballance of the Lead It cannot be the first because 12 cannot be in Aequipondio with 18 it must then be in the second Or if these 18 ounces in the scale O be the counterpoise of the Water within the Glass I inquire what sustains the weight of the Lead B The weight of it cannot be sustained by the Water because 't is a body naturally heavier than Water it must therefore be sustained by the ballance I answer that this specious objection seems for it is somewhat obscurely worded to be founded upon a mistake of my meaning in the Question However as to the Phaenomenon it self according to my sence the 18 ounces in the scale O are the counterpoise of the 18 ounces that hang from the opposite and aequidistant Scale and make up the Leaden Plummet B which answer I see not how our Author prevents But then you will ask what counterpoises the Water in the bubble which alone weighs 12 ounces I answer that 't is the gravitation of the collateral Water which presses the other parts of the lately mentioned imaginary Plane as much as the Water in the bubble the weight of the Glass being here not reckon'd by either of us and the Water incumbent on the bubble does press that part of the Plane on which they lean so that there being in all 30 ounces to be sustained the 18 of the Plummet and the 12 contained in the Glass the Lead that hangs in the Water is counterpoised by 18 ounces in the scale and the Water in the bubble by the pressure of the Collateral Water But you will say that it appears not that the included Water presses at all since it does not at all descend To which I answer that as long as the Water was getting into the Cavity of the bubble so long it did manifestly gravitate upon the subjacent Plane and actually descend raising the counterpoise in the scale But when by adding more weight to that counterpoise things are brought to a new Aequilibrium there is no reason why the gravitation of the VVater should again change the now regain'd Aequipondium Suppose in the two scales of a ballance there were placed two equally capacious and equiponderant Vials whereof one is quite full and the other almost full 't is evident that the full Vessel will keep the scale it lean'd upon deprest and if you gently pour in as much VVater into the unfill'd as the fill'd has more than it the scale that was formerly kept rais'd will be now deprest till the beam be brought to be horizontal to which posture when it is once brought the Aequilibrium will continue And yet it will not be said that though the added VVater whilst it was filling the Glass deprest the scale it belonged to yet it lost its weight or which in my sence is all one did not gravitate upon the Scale when the ballance was come to an Aequilibrium because then this VVater did no longer depress it And how much the VVater in our bubble does notwithstanding its immersion gravitate would be visible if by supposition it were all annihilated and no other suffer'd to supply its room For then the subjacent part of the imaginary Plane being much less prest than immediately before the weight of the collaterally superiour VVater would strongly impell up the bubble if it were not kept in its place by a proportionable addition of weight to the Plummet Nor should it seem a strange thing that I should say that the 30 ounces lately mentioned should be counterballanced partly by the weight in the opposite Scale and partly by the VVater that fills the immers'd bubble since this notion may be warranted even by the common practice of weighing heavy Solids Hydrostatically For if you would for instance weigh a lump of Copper of 9 pound in common VVater the Metal hanging by a Horse-hair under VVater will need according to my elsewhere mention'd Experiments either just or near about 8 pound in the opposite Scale to keep the ballance horizontal so that the whole 9 pound that the lump weighed in the Air is counterpoised partly by the 8 pound newly mention'd in the opposite Scale and partly by the weight or resistance following from weight of as much of the VVater as the Copper fills the room of which as experience shews is one pound And if we should conceive VVater in a Vessel adiaphorous as to Gravity and Levity to be substituted in the place of the Metalline lump it would weigh as much as the ninth part of the Copper-lump weighed in the Air and the same counterpoise of eight pound would maintain the Aequilibrium What the Learned Objector has at the close of his Discourse about the natural and artificial ballance could not without prolixity and is not here necessary to be dwelt upon especially since you will see in what I suppose you have now received from the Press in answer to the Ingenious Doctor More what is to be said on that Subject according to my Hypothesis VVherefore though my Learned Adversary does in the 152. page conclude That Water cannot weigh in Water and asserts that the Pressure of VVater is one thing and VVater to Weigh in VVater is another yet as I said at first I conceive much of our Difference may be verbal and in my sence when VVater presses subjacent VVater because it does so upon the score of its gravity it gravitates in VVater though it does not pregravitate that is actually descend And since 't is in the sence of this last expression that our Author if I mistake him not speaks of weighing in VVater his conclusion that VVater cannot weigh in VVater does not contradict me who affirm not that VVater does so weigh in VVater VVhether we shall agree in all other points of Hydrostaticks you will easily believe that I cannot yet tell though by the expression he is pleased to use in the 146. page to usher in his Objection with 't is probable we may And as to the now dispatch'd debate if I have imployed some words in another sence than he I presume he is so equitable as to consider that I did not write of these things after having seen this book of his but some years before and have since found those expressions justified by the use that eminent VVriters have thought fit to make of them And however I am glad that he has given me this opportunity of clearing my Experiment and declaring by examples as well as words the opinion it relates to especially if it seems to others that I omitted to express my self so fully my design being as I formerly told you to convince such Adversaries as I then had met with by shewing that the above-recited Phaenomena of the Emersion and Sinking of a Glass-Vial depended upon