[184 3 
Centfc, the atttafting Points and iTcT, have ftill 
fome Force to help to bring back the Particles to their 
whole Contad 5 becaufe in this Shape of the Particle 
the attradling Points f, cT, S' are remov’d but in Pro- 
portion to their Diftance from the angular Point d ; 
whereas if the Particles had been fpherical, and the 
Line dS zn Arc of a Circle, the attrading Points c,c, 
and Si S, would have remov’d from one another far- 
ther than in Proportion to twice the Square of the 
Diftance from d^ (as in Fig. 5.) and fb have afforded 
very little Help for bringing back the Particles to 
their Contad. A Row of Particles in the Spring thus 
condition’d, is to be feen in the natural State at B Ay 
Fig. 10. and bent at in the fame Figure. Here 
it is to be obferv’d, that if in this Figure of the Par- 
ticles you would bend the Spring to bring the Par- 
ticles to touch at their Point of breaking <:_/Eqmli~ 
brium, you muft open them fo much on the contrary 
Side, that the Spring will be bent far beyond any 
Ufes intended to be made of it, as appears by Fig. 
II. where two Particles are brought to touch at the 
equilibrating Point eh and by Fig. 12. where many 
Particles being put into that Condition, the Spring 
is brought round quite into a Circle. 
Now the common Pradice in making Springs is 
the mod likely to produce this Effed requir’d in the 
Particles 5 for the hard Spring, whofe Particles were 
round, or nearly fo, is heated anew, and whilft it is 
cooling gently, the mutual Attradion increafes the 
Contad, fo that the Particles grow flatter in thofe 
Places where before they had but a fmall Contad 5 
and left this Contad fhould become too great, the 
Spring’s Softening is flopp’d by quenching it in Water, 
or 
