CHAP. XIV. Softness, Hardness, Flexility▪ Tra∣ctility, Ductility, &c. p. 325.
SECT. I.
ARTIC.
- 1 THe Illation of the Chapter.
- ibid.
- 2 Hard and Soft, defined.
- ibid.
- 3 The Difference betwixt a Soft and Fluid.
- 326
- 4 Solidity of Atoms, the Fundament of Hard∣ness and Inanity intercepted among them, the fundament of Softness, in all Concretions.
- ibid.
- 5 Hardness and Softness, no Absolute, but meer∣ly Comparative Qualities; as adscriptive to Concretions, contrary to Aristotle.
- 327
- 6 Softness in Firme things, deduced from the same cause, as Fluidity in Fluid ones.
- ibid.
- 7 The General Reason of the Mollification of Hard, and Induration of Soft bodies.
- ibid.
- 8 The special manners of the M••llification of Hard: and Induration of Soft bodies.
- 328
- 9 PROBLEM Why Iron is Hardned, by being immersed red-hot into Cold Water; and its SOLVTION.
- ibid.
- 10 The Formal Reasons of Softness and Hard∣ness.
- 329
- 11 The ground of Aristotles Distinction betwixt Formatilia and Pressilia.
- ibid.
- 12 Two Axioms, concerning, and illustrating the nature of Softness.
- 330
SECT. II.
ARTIC.
- 1 FLexility, Tractility, Ductility, &c. derived from Softness, and Rigidity from Hard∣ness
- 3••1
- 2 PROBLEM. What is the Cause of the moti∣on of Restoration in Flexiles? and the Solut.
- ibid.
- 3 Two Obstructions expeded.
- 332
- 4 Why Flexile bodies grow weak, by overmuch, and over frequent Bending
- 333
- 5 The Reason of the frequent Vibrations, or Di∣adroms of Lutestrings, and oth••r Tractile Bo∣dies; declared to be the same with that of the Restorative Motion of Flexiles: and demon∣strated.
- ibid.
- 6 PROBLEM. Why the Vibrations, or Dio∣droms of a Chord distended and percussed, are Aequitemperaneous, though not Aequispatial: and the SOLVT.
- 335
- 7 PROBLEM. VVy doth a Chord of a duple length, perform its diadroms in a proportion of time duple, to a Chord of a single length; both being distended by equal force; and yet if the Chord of the duple length be distended by a du∣ple force or weight, it doth not perform its Di∣adroms, in a proportion of time duple to that of the other; but onely if the Force or weight di∣stending it, be quadruple to the First supposed: and its SOLVT.
- 336
- 8 The Reasons of the vast Ductility, or Exten∣sibility of Gold.
- 337
- 9 Sectility and Fissility, the Consequents of Softness.
- ibid.
- 10 Tractility and Friability, the Consequents of Hardness.
- 338
- 11 Ruptility the Consequent partly of Softness, partly of Hardness.
- 339
- 12 PROBLEM. VVhy Chords distended, are more apt to break neer the Ends, than in the middle? and its SOLVT.
- ibid.